Telephone Switching System Including Toll Service Desk

Abstract

A telephone central office system incorporating a toll service desk with special switching equipment including toll recording trunks which reduces the extent of operator participation in processing telephone calls, and which uses a reduced number of trunks to effect improved service. Operators at the toll service desks can handle call items in any order, but cannot release a call until all requirements are met. In calls requiring operator participation, the operator may release once the service necessary to establish or forward the call is given, and is relieved from manually having to make out tickets on any calls except on calls to subscribers in non-dialable offices involving alpha-numeric directory numbers. Special features of the system include flash recall of an operator at any time on any call, automatic answer time display upon flash recall from a non-coin station, automatic answer time display during the initial period and elapsed time display after the initial period upon flash recall from a coin station, reestablishment without rekeying of a call in the forward direction after flash recall, automatic or manual insertion of time and charge and class-change, and changing a call status by the operator from station-to-station to person-to-person and vice versa.

Description

CROSS-REFERENCE TO RELATED APPLICATION

A system for training operators for work with the above described toll service position boards is found in a copending patent application which was filed as of even date herewith by Carl Gunnar Svala and Chung-Pah Xavier Lee and assigned to the assignee of the present application.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to telephone switching systems involving a manual operator which might be classified in 179-27.

2. Description of the Prior Art

In earlier telephone systems, manual boards equipped with plugs and jacks were provided for use by attendant operators in the establishment of connections between subscribers of the exchange. As the art progressed, automatic switching equipment was developed which permitted subscribers to dial local calls without operator assistance, while yet permitting access to an operator for the purpose of seeking assistance in establishing toll calls. The operator was also required in such system to prepare toll tickets for billing purposes. With the advent of extended area free service, it became possible for subscribers to dial into or through distant offices, but operators with cord boards were still required in establishing dial assistance and toll calls, and for the purpose of preparing and completing toll tickets for billing purposes.

In more recent years automatic toll ticketing has been developed which permits subscribers to dial so called nonpremium toll calls, with automatic ticketing equipment providing a ticket for the call to thereby relieve the operator of such burden. A non-coin,direct distance dialed, station-to-station call is typical of the type of call which might be handled by the system and ticketed without operators participation. While such capability did reduce the burden placed upon the operators, and did provide more efficient service to the subscribers, it was still necessary for operators with cord boards to handle and make out toll tickets for dial assistance calls and for person-to-person calls, collect calls, credit card calls, charge to third party calls, direct distance dialed coin calls, premium toll ticketed coin and non-coin premium toll calls. Furthermore it was necessary for the operator to stay with such calls until the parties released. In certain installations (CAMA equipment, for example) operators using cord boards were called in momentarily to ascertain the calling subscriber identity, and after keying such identity into the equipment, were permitted to release.

More recently there has been developed a system having toll service positions and associated equipment wherein operator boards with pushbuttons (instead of plugs and jacks) provide greater operator convenience and efficiency in handling dial assistance calls, CAMA calls, and toll calls. With such equipment, in most types of calls, (1) the operator is only required to connect to the call momentarily and can then release; (2) is not required to transfer the calls to cord and plug boards; and (3) is not required to manually prepare tickets for billing purposes.

While such equipment is a definite advance in the art, the operator involvement is still too great; that is, in each call to an operator's position requiring time and charge, the operator is required to perform a manual operation to insert time and charge; in certain types of calls (such as coin dial 0 calls, notification calls, and time and charge calls) operators are required to stay connected to the call for the duration of the call (a condition which seriously limits the efficiency of the system) and in certain other types of calls (such as mobile calls) the operators are required to transfer the calls to plug and jack boards; and on certain types of calls (such as coin dial 0 calls, coin dial 1+ calls changed to coin dial 0+ calls, operator originated calls, any third number calls, credit card calls, and time and charge calls) the operator is required to manually prepare tickets. Further, flash recall is operative only on calls originated from coin stations, and then for only the first 42 seconds. On calls returned to the operator's board such as by means of flash recall within the 42 seconds which can only be from a coin station, the operator has to again key pulse the called number. On coin dial 1+ calls (i.e. non-premium direct distance dialed calls originated at a coin station by first dialing the digit 1) the operator has to insert the class-charge. The boards further were not arranged to handle hotel dial 1+ calls, inward assistance calls, and WH calls.

Equipment which is generally indicative of the state of the art at the time of the present invention is shown in U.S. Pat. Nos. 3,341,661 and 3,341,662.

SUMMARY OF THE INVENTION

The present invention is directed to a novel system which provides many of the above noted services which were not previously available, and which achieves such service with a substantially reduced number of special trunks. That is, novel universal toll recording trunks are provided which are capable of handling any of the many different forms of toll calls, any of the inward assistance calls, and any of the outgoing calls from a toll service position.

In addition to the new and different universal trunks, the switching system is connected to permit establishment of a connection from each toll recording trunk to an idle toll service desk over a set of switching equipment, and to thereafter establish a bypath between the memory, trunk and toll service desk for signalling purposes, whereby a substantial reduction in the amount of switching equipment is effected.

The novel system further includes an arrangement which permits flash recall of the operator on any call at any time (particularly on non-coin calls and on coin calls beyond the first 42 seconds of the prior art); and which upon flash recall on non-coin calls effects automatic answer time display to the operator. In addition, upon flash recall on coin calls, answer time display is automatic during the initial period (3, 4, or 5 minutes) and elapsed time display is automatic after the initial period. After flash recall, release and reestablishment of the call in the forward direction is accomplished by the operator without re-keying.

The new and different system also provides time and charge information automatically without requiring a manual operation of any device, and without requiring the operator to stay on the call, and without requiring the operator to prepare a ticket.

The system is the first arrangement which is capable of handling calls requiring an additional number or room number for ticketing purposes (such as hotel dial 1+ calls), inward assistance calls, and WH calls, and which is also operative to handle special originated calls, such as calls originated by a mobile subscriber, without the requirement that the operator transfer the call to a plug and jack board. Also, automatic insert of class-charge for coin 1+ calls (as well as for all other dial 1+ calls) is provided without requiring a manual operation. Furthermore, for the first time the operator may release after momentary assistance has been provided for coin dial 0 calls, notification calls, and time and charge calls.

The system is further novel in its ability to automatically prepare tickets for coin dial 0, coin dial 1+ changed to coin dial 0+ calls or vice versa, third number, credit card, time and charge, and operator originated (OGT) calls, whereby the operator time in handling such type calls is reduced.

Yet another feature of the system is the manner in which all calls are initially allowed to float. As a result an operator's desk requires connection to a call only during the time that manual functions are required. Once the operator has satisfied the immediate requirements of the call, she can release her desk from the call and be available to other calls requiring her participation. The toll recording trunk, however, may connect an operator several times during the same call. For example, a subscriber may ask to be notified at the end of the base charge period. In this case the operator, after keying the base charge period indication, can release the call from her desk. The trunk will then time the call and request an operator when the time period has lapsed. It should be noted that the operator connected the second time may not be the same one that originally handled the call. All of the call's statistics are available to the new operator thru lamp indications and numerical displays.

The operator has the ability to change any number at any time, until timing has started, and the keying of numbers can occur in any sequential order. This flexible sequence allows an operator to key information in the order that she receives it from a subscriber. This feature eliminates the need for her to make scratch pad notes. The fact that numbers can be changed allows the operator to "follow" a called person to another terminating number without forcing the originating subscriber to replace the call even though he may have dialed the original number himself.

Another feature allows the operator to re-send the called number without re-keying. For example, a call may reach a busy signal on the first attempt. The operator can release the forward connection by pushing the release forward key and then simply reoperate the start key. The machine will re-send the called number that has been stored in the memory. This operation can be repeated as many times as required.

The flexibility of operation of the desk is complemented by a status checking feature which insures that all required billing information has been stored in the memory. Should any of this required information be absent, the equipment will not permit the operator to release from the call.

Also, the system permits the operator to change class-charge at any time until timing has started.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2, placed side by side as shown in FIG. 112, constitute a block diagram of the system,

FIGS. 3 and 4, placed one above the other as shown in FIG. 113, constitutes a more detailed block diagram of certain portions of the system,

FIG. 5 constitutes a schematic diagram of the lamp panel and keyboard of the operator's toll service desk (TSD),

FIGS. 6-9, assembled as shown in FIG. 114, constitute a showing of certain portions of the toll recording trunk (TRT), toll ticketing register (Reg TT), identifier buffer register (IBR), and code sending converter (CSC) which derive functions for system operation which become stored in the memory,

FIGS. 10- 15, assembled as shown in FIG. 115, constitute a schematic diagram of the toll ticketing register (Reg TT),

FIGS. 16-21, assembled as shown in FIG. 115, constitute a schematic diagram of the identifier buffer register (IBR),

FIGS. 22-49, assembled as shown in FIG. 116, constitute a schematic diagram of the toll position control (TPC),

FIGS. 50-74, assembled as shown in FIG. 117, constitute a schematic diagram of the memory (MEM),

FIGS. 75-80, assembled as shown in FIG. 118, constitute a schematic diagram of the category decoder (CD),

FIGS. 81-107, assembled as shown in FIG. 119, constitute a schematic diagram of the toll recording trunk (TRT-0),

FIGS. 108-111, assembled as shown in FIG. 120, constitute a schematic diagram of the code sending converter (CSC),

FIG. 112 is an assembly drawing for FIGS. 1 and 2,

FIG. 113 is an assembly drawing for FIGS. 3 and 4,

FIG. 114 is an assembly drawing for FIGS. 6-9,

FIG. 115 is an assembly drawing for FIGS. 10-21,

FIG. 116 is an assembly drawing for FIGS. 22-49,

FIG. 117 is an assembly drawing for FIGS. 50-74,

FIG. 118 is an assembly drawing for FIGS. 75-80,

FIG. 119 is an assembly drawing for FIGS. 81-107, and

FIG. 120 is an assembly drawing for FIGS. 108-111.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As an aid in understanding of the following description, the definitions of certain terms are initially set forth.

The term "toll call" as used in this specification includes long-distance calls including WH calls for which a charge is assessed via the toll ticketing equipment of this office, and may or may not involve a toll service desk.

The term "assistance call" as used in this specification includes local dial assistance calls, inward assistance calls from distant operators including an inward call to a paystation collect, and outward assistance calls to distant operators.

The term "dial 1+ call" as used in this specification includes non-premium direct distance dialed calls, such as station-to-station calls, and only involves an operator if operator number identification (calling) is necessary. The subscriber, coin or non-coin, may dial a prefix, such as 1, plus the called number. The prefix may be some other digit than 1, or a plural digit code.

The term "dial 0" call as used in this specification includes calls directed to the operator without the subscriber, coin or non-coin, dialing a called number and can be assistance or toll calls. A plural digit code may be used instead of 0.

The term "dial 0+ call" as used in this specification includes premium toll ticketed calls, such as person-to-person calls, collect calls, credit card calls, and charge-to-third-party calls directed to an operator who must perform some function or functions relative to such calls. The calling subscriber dials the prefix such as 0 plus the called number. A plural digit code may be dialed instead of the digit 0.

In person to person calls in which the called party is not available, the calling subscriber may request the outward toll operator to "leave word" for the called party to call back the calling party. The resultant call as received at the originating end is known as "WH" call.

HOTEL CALL

A general description, based on FIGS. 1 and 2, will now be given of the manner in which a hotel call requiring an extension number is extended over the system, and the novel manner in which a time and charge ticket are provided. As will be shown the novel system of the present invention reduces the lengthy work-time previously required by an operator in servicing this type of call.

With reference to FIG. 1, a subscriber line is connected to an idle SOT over path A indicated as (A) by the SLM via the SLA and SLB switches in known manner. Simultaneously an idle sender SDR-0 and register Reg-0 are connected to the SOT via a SRL switch over a path indicated as (B). The Reg-0, a storage device for called information, receives the information dialed by the subscriber and causes it to be presented to the SDR-0 which connects to the translator TNS (C) to determine the routing information required to complete the call. This being a long distance 1+ sent paid call, the translator sends routing information to the SDR-0 that will direct the call to an idle TRT-0. More specifically the Sender 0 via Reg-0, SRL, and SOT transmits the routing information to the group selector marker GSM which connects an idle TRT-0 (D) to the SOT via GSA and GSB switches. The TRT-0, on seizure, connects via the RRL link to an idle Reg TT (E) which then transmits a signal back over the established path to the Sender 0 causing the called information to be sent over such path to the Reg TT. The Reg TT, having received the called information, calls in an identification buffer register, IBR (F) requesting the identification and category of the calling telephone. The IBR connects to the automatic line identifier ALI (G), which transmits a tone back to the originating subscriber line circuit via IBR, RTT, RRL, TRT-0, etc. (G, F, E, D, A) where it is extended to the core panel (H). The core panel detects the tone, converts it to the subscribers directory number and category and transmits the numbers to the ALI (I). This information is transmitted back to the IBR (G) and the ALI is disconnected. The IBR, having received the calling information, causes it to be stored in the memory MEM (J) and signals the Reg TT (F) to send the called information to the memory MEM (K).

The memory, analyzing the called and calling information and, via the category decoder (L), the category of the telephone, realizes that more information is necessary to complete the call. The category, being that of a hotel subscriber, requires a four digit room or extension number for completion. The memory transmits a signal via the Reg TT (K) to the TRT-0 (E) to stop the forward progress of the call and to disconnect the Reg TT, IBR, SDR-0 and Reg 0.

The TRT-0, also, upon receipt of this signal, activates the TSD link marker (M) causing an idle position control circuit TPC (N) to be connected via the ASW, BSW, and CSW switches to the TRT-0.

Upon seizure of the position control circuit TPC, a signal is sent to the memory MEM (O) via the TRT-0, causing the memory MEM to connect to the TPC via the TRT-0 and to pass all the previously stored information (O).

The toll position control TPC is directly attached to an operator position TSD (P) which has lamp indicators controlled via the TPC for showing the status and type of call to be serviced. The operator is visually informed by the lamp indicators that the exemplary call is a hotel, station paid call with automatic time and charge, and that a four digit room or guest number is required to complete the call.

Upon accessing the call, the operator orally obtains the four digit number and keys the same into the memory over path Q via the PML link.

The TPC, being satisfied that all information necessary to complete the call is now stored in the memory, causes the TRT-0 (O) to seize an idle register Reg I (R) and Sender SDR-I via the TRL switch and signals the memory (O) to transfer the called information to the code sending converter CSC (S) which in turn code sends to the Reg I (T & R) and SDR-I where the called information is then routed through the TRT-0 and the group selector GSA and GSB switches (R & U), to an idle outgoing trunk (U) to the terminating office.

The called party on answer causes the TRT-0 to send a signal to the memory (O) which connects to the clock and calendar circuit (V), whereupon the answer time is then entered into the memory for storage.

Upon completion of the call, when the calling and called subscribers disconnect and the switching train is released, the TRT-0 signals for disconnect time (V) to be entered into the memory. The memory, upon storage of disconnect time, connects itself to an idle TRO (W) and passes all the information concerning the call to the TRO where a time and charge ticket (X) is printed and a punched paper tape (Y) is made for billing records.

Upon completion of the transfer of information between the memory and the TRO, TRT-0 is released and made available for a new call.

It should be noted at this time that the TRT-0 will handle all types of calls and that many special types of trunks are not required. Calls associated with incoming and outgoing trunks and local subscriber lines requiring toll ticketing and/or operator attention are all handled by this one type of trunk.

A more detailed description, based on FIGS. 3 and 4, will now be given showing the interrelationship and function of various circuits involved in this invention, using the aforementioned hotel 1+ station-paid call which will illustrate the manner is which the disclosed system minimizes operator work-time.

With reference to the previous general description, it is assumed that the hotel subscriber has completed dialing a 1+ 10 digit number and the digital information has been stored in the toll ticketing register Reg TT. The Sender SDR-O has gone to the translator TNS for routing information and has now seized an idle TRT-0 over path INC (FIG. 4) which on seizure, connects the sender SDR-0 to an idle Reg TT via the TRT-0 connect relays, path RTT and the RRL switch. The sender, on connection to the Reg TT, sends the called information to the Reg TT for storage in the Reg TT storage relays. The Reg TT, having received the called information and a start signal, connects to and signals an idle IBR (BR) to secure the category and directory number of the calling telephone.

The IBR connects to the ALI (LI), and receives and stores in the IBR storage relays, the category and directory number of the calling telephone, disconnects from the ALI, and prepares to enter the information in the memory core stack. Since the memory core stack has the ability of storing all information for 30 TRT-0s, it is necessary to identify the particular TRT-0 and the particular function being processed. The IBR storage relays prepare the IBR stepping chain (ISC) to send the stored information to the memory core stack and to seize a memory function relay (BRF).

In the memory, the memory function relay back signals on the BRF path through the IBR stepping chain and storage relays on the MG path through the TRT-0 function relays to operate the proper TRT-0 identity relay (TI) in the memory. This method of back signaling ensures that the function about to be processed will be processed for the proper TRT-0 and is described more fully in the detailed description. The TRT-0 identity relay signals the TRT-0 core stack identity relays (TCI) to prepare that part of the memory core stack (TCS) to be used by that particular TRT-0. The memory function relay also signals the memory function identity (MF) to further prepare the memory core stack (FCS) for the function about to be processed. The memory function relay also prepares the memory stepping chain (MSC) for the receipt of a 10 digit entrance and signals the proper memory connect relays (MCR) to operate. On operation of the memory connect relays, a path is closed to the IBR (B) to send the 10 digit entrance. The IBR, in sequence, sends to the memory core stack via the memory connect relays (B), memory stepping chain (CN) and electronic interface (EI) the category and directory number of the calling telephone and also a class-charge indication, since the subscriber has dialed a 1+ 10 digit number. (On any other type of call, no class-charge information would be sent.)

The category information is also extended via the memory connect relays to the category decoder (CD) where the information is analyzed to determine the type of telephone placing the call. This being a hotel call, a signal is sent from the category decoder to the TRT-0 via the memory connect relays (CD) and Reg TT stepping chain (R) and storage relays (SC) to stop the forward process of the call and disconnect the originating sender and register (INC). The IBR, (FIG. 4) having sent the calling information, signals the Reg TT storage relays (BR) to send the called information. The TRT-0 identity relays, TRT-0 core stack identity relays, and the memory connect relays remain in their present condition. The memory function relays are conditioned by the Reg TT to prepare the memory stepping chain (MSC) and activate the memory function identity (MF) which will further prepare the memory core stack (FSC) for the particular function involved. The called information and the identity of the Reg TT is then send to the memory core stack via the memory connect relays (R), memory stepping chain (CN) and electronic interface (EI). A finish signal from the Reg TT is sent to the TRT-0 (RTT) and the Reg TT, IBR, category decoder, and memory are disconnected. The TRT-0, having received the finish signal from the Reg TT, sends a non-priority call signal to the TSD link marker (CKM) causing an idle TPC to be connected to the TRT-0 via the ASW, BSW and CSW switches (AC) (OC).

A priority call signal is such that it pre-empts all other call signals, i.e. flash recall, and such call is completed first. A non-priority call signal is such, that should other non-priority calls be attempting to engage a TSD, this call would wait its turn.

Upon connection of the TRT-0 to a TPC, the operator is informed by lamp indicators of the type and status of the call which she is about to process. This is accomplished automatically when the TPC and TRT-0 are connected. The TPC, upon being connected to the TRT-O, automatically operates a TPC function relay. This function relay, being operated, signals the TRT-O function relays (FU) via CSW, BSW, and ASW switches to prepare to receive a function. A function receive relay in the TRT-O function relays operates thereby closing a direct path from the TRT-P function relays (DF) to the TPC function relays. The function is then transmitted directly from the TPC function relays (DF) to the TRT-O function relays. That particular function relay, being operated in the TRT-O, back signals the TPC function relays (DF) that the function has been received and the TPC function relay is released.

The TRT-O function relay being operated signals the memory function relay (TF) in the identical manner that was previously described when the IBR was connected to the memory, with the exception that the function, being unique to the initial connection between the TPC and the TRT-O, is such that all the information stored in the memory core stack concerning that TRT-O will be retrieved by the electronic interface (M) and sent via synchronous pulse to the synchronous pulse receiver in the TPC via the memory connect relays (CE), the ASW, BSW, and CSW switches (SR). (See U. S. Pat. No. 3,218,392 assigned to the assignee of the present invention.)

The synchronous pulse receiver then translates the pulses to a potential that will operate associated relays, kind of call (KR), class charge (CR), and the status relays (SRS) which give the operator visual indications as to the type and status of the call. This function being completed, a finish signal is sent from memory function relays (TF) to the TRT-O which releases the TRT-O function relays and the memory is disconnected.

The operator is now aware that this is a hotel 1+ (kind-of-call), station-paid (class-charge), with automatic time and charge (status), and that to complete the call, only a four digit guest or extension number (status) is required. The operator accesses the call by depressing the lighted access key designated ACS on the toll service desk and orally obtains the four digit guest or extension number. The operator depresses the corresponding status key KP GST which operates a status relay (SK). The operated status relay prepares the TPC stepping chain (PR) for entrance of the digital information into the TPC relay storage. Also, the status relay has presented a signal toward the memory (KP) preparatory to operating the proper memory function relay (MCR). The operator keys the four digit number into the TPC relay storage via the key set buffer (OK) and the TPC stepping chain (KST). The TPC stepping chain, on completion of the fourth digit, automatically operates a TPC function relay (FR).

The TPC function relay, when operated, causes a signal to be sent via CSW, BSW, and ASW switches to O TRT-P function relays (FU), as previously described, operating a TRT-O function receive relay. The operation of this relay then closes a direct path between the TRT-O function relays (DF) and the TPC function relays for the transmittal of the particular function.

The function having been transmitted, the function relay in the TRT-O being operated, back signals the TPC function relay (DF) that the function has been received and the TPC function relay is released. This being a transmittal of digital data between the TPC and the memory core stack, the primary purpose of this particular function is the identification of the TRT-O (TI) (TCI) which will prepare that part of the memory core stack (TCS) that will be involved, as previously described when the IBR was connected and to operate the PML crossbar switch (LC) and memory connect relays (MCR). The previously prepared signal presented by the status relay (KP) is sent through the PML link (KP) through the memory connect relays (MCR) to the memory function relays. This second function relay now prepares the memory stepping chain (MSC), the memory function identification (MF), and electronic interface (EI) as previously described when the IBR was connected.

After the memory stepping chain (CN) and the function relay (MCR) have been connected directly to the TPC stepping chain (DA) and TPC relay storage via the PML, a signal is sent to retrieve the information from the TPC relay storage and transmit it to the memory core stack. Upon completion, a finish signal is sent from the stepping chain (CN) back through the memory connect relay (SR), sync pulse receive (SRS) to release the status relay which in turn releases the stepping chain (PR) and functions (PB) previously established in the TPC.

The TPC status relays automatically, (because all conditions have been satisfied), now cause the TPC function relays (PB) to again signal the TRT-O function relays (FU). The present signalling is for the purpose of starting the forward build-up of the call.

Again, the operation of the TPC function relays signals the TRT-O function receive relay (FU) to directly close a path between the TPC function relay (DF) and the TRT-O function relay. The direct path being closed through, the particular function is transmitted to the TRT-O and with its operation, a back signal is sent to release the TPC function relay (DF).

At this time, it is only necessary for the operator to disconnect the position from the TRT-O because the position and the memory have been satisfied.

The TRT-O function relay again signals the memory function relay (TF). Upon the operation of the memory function relay, a back signal is sent through the TRT-O function relay (TF) to the TRT-O identity relay (TI) causing the identification of that particular TRT-O. The memory function relays again prepare the memory stepping chain (MSC), electronic interface (EI), and the memory function identity (MF). The TRT-O identity relays again prepare the TRT-O core stack identification relays and prepare the memory core stack.

Because the call at this time is being initiated forward, it is necessary to retrieve the called number from the memory. Because of the particular function relay in the memory being operated, the memory connect relays are now connected to the code sending converter (CCS).

Upon completion of this connection, the called number is retrieved from the memory core stack via the electronic interface (M) through the memory connect relays (CE) and stored in the code sending converter storage relays (CCS) and the memory disconnects.

At the same time, in the TRT-O, because of the particular function, the TRT-O connect relays are then closed through to the code sending stepping chain (CP).

The TRT-O, through its connect relays, causes the code sending converter stepping chain to be closed through to a register and sender (OGA) for the sending of information from the code sending converter storage relays and, upon being connected, the code sending converter code pulses the called information, and, upon completion, is disconnected. The register-sender (SDR-I and Reg I) now outpulses the called information for the ultimate completion of the call.

When the called party answers, the TRT-O connect relays (TF) signal the TRT-O function relays (TI, TF) to cause the memory to momentarily connect to the clock and calendar circuit (C) for entrance of answer time in the memory core stacks.

When the call has been completed, the calling and called parties going on hook, the switching train is released but the TRT-O is held and the TRT-O connect relays again signal the TRT-O function relays (TF) to cause the memory to connect to the clock and calendar circuit (C) for disconnect time to be entered into the memory core stack. The memory function relays, after disconnect time has been entered, cause the memory to be connected over path T to a ticketing readout out circuit (See FIG. 2) TRO. On connection to the TRO, all the information concerning the call is transferred and the memory disconnects. When the memory disconnects from the TRO, a finish signal is sent to the TRT-O (TF) and the TRT-O releases and is available for another call.

DETAILED DESCRIPTION OF HOTEL 1+ STATION PAID CALL

A detailed description of the operation of the system in the establishment of a Hotel 1+ station paid call is now set forth

a. Seizure of Idle TRT-O

It is assumed, as described earlier, that a Hotel 1+ call has been initiated and advanced through the system to the SDR-O (FIG. 1 which now directs the call to an idle TRT-O with reference to FIG. 87). Seizure of the TRT-O occurs when ground forwarded by the preceeding circuits is applied to the S lead (FIG. 87) which operates ON relay (FIG. 87) via break contacts of RB, RF, and RC. ON relay operates H (FIG. 101) and C1 (FIG. 88). C1 operates C1a (FIG 88); H operates HB FIG. 101), HB operates HA (FIG. 96). HA applies triangle, circle, and rectangle 2 ground (FIG. 96) to various parts of the circuit and also rectangle 1 ground (FIG. 82). Triangle master ground operates FC (FIG. 94 upper left hand corner), DA (FIG. 95) and DA operates DA1 (FIG. 95). Master triangle ground (FIG. 93) presents a ground on the CS lead to the RRL switch (FIG. 84). Ground, through the coil of RC (FIG. 84), is extended to the RC lead (FIG. 84) to the Reg. TT.

b. Seizure of Reg TT

Seizure of the Reg TT occurs on closure of the crosspoints of the RRL switch which was seized by the ground on the CS lead. (FIGS. 10 through 15 are a detached contact drawing of the Reg TT which was previously described in general terms in the description of FIGS. 1 and 4.) Ground is extended from the Sender 0 on the C lead via the TRT-0 operating the ON relay (FIG. 10). Ground is also extended through the RRL switch on the RC lead which operates the RS and P relays in series, as shown in FIG. 10, and the RC relay in the TRT-0 (FIG. 84). The RS prepares an operating path for H (FIG. 10) and operates D (FIG. 11, Seg. 2) allowing H to operate. Operation of H (FIG. 11, Seg. 1) applies battery to a voltage divider and out on the T lead as a start signal to the Sender-0. H also provides master ground, rectangle 1, 2, 3 and triangle ground (FIG. 10) to various parts of the circuit. FCL operates to triangle ground (FIG. 11, Seg. 3) closing a path to operate RF (FIG. 14). The Reg TT is now ready to receive code signals from the Sender-0 over the T and R leads.

c. Transmission of Digits by Sender 0 to Reg TT

The first digit received will be a class marking. For this type of call (Hotel 1+) the sender will send +48V on the T lead operating the R1 and R2 relays (FIG. 11, Seg. 1) which in turn operates the 1 and 2 relays (FIG. 12) and extends ground to hold 1 and 2. Operation of 1 and 2 opens the holding ground of D (FIG. 11, Seg. 2) allowing D to release. The release of D (FIG. 12) extends ground through the 1 and 2 and FCL relays to operate CL1 and CL2. The NS relay (FIG. 10) is operated on the release of D and holds through the Reg TT holding time.

The Sender-0 removes +48V from the T lead which releases R1 and R2 (FIG. 11, Seg. 1) which in turn removes the holding ground from 1 and 2 (FIG. 12) which release and allows D to operate (FIG. 11, Seg. 2). Operation of D (FIG. 11, Seg. 3, upper right corner) extends a ground to operate EV and PTY through the make contact of FCL. Operation of PTY releases FCL.

At this time the class digit has been stored, and the Reg TT is now ready to receive the second or party digit. The Sender-0 presents -48V on the T lead (FIG. 11, Seg. 1) operating R1 which operates 1 and the operation of 1 releases D (FIG. 11, Seg. 2). 1 operating provides a path to operate 0 (FIG. 12). The release of D (FIG. 12) extends ground through 1 and 0 and PTY relays to operate PO and P1 (FIG. 13), and releases EV (FIG. 11, Seg. 3). The Sender-0 then removes the signal and R1 releases (FIG. 11, Seg. 1). R1 releases 1 and 0 causing D to operate (FIG. 11, Seg. 2). The operation of D (FIG. 11, Seg. 3) operates RA1 and OD. RA1 releases PTY. The party digit storage cycle is now complete.

All other digits are received and stored in like manner. The storage of the tenth digit causes RA11 to operate which in turn closes a ground through to operate AR (FIG. 11, Seg. 3) which, when the Reg TT is connected to the memory, will indicate an area code is present.

The Sender-0 having completed the transfer of called information sends a start signal. +48V on the T and R leads (FIG. 11, Seg. 1) operates R1, R2, R4 and R7 which extend a ground (FIG. 11, Seg. 2) to operate ST which in turn opens the T and R leads (FIG. 11, Seg. 1) releasing the R relays. ST operates STA (FIG. 14) which removes battery from the voltage divider (FIG. 11, Seg. 1) and closes a path to operate PRG (FIG. 10). PRG extends a ground (FIG. 13) to operate BR1 which operates BR2. BR1 extends the grounds from the PO and P1 relays (FIG. 13) and a battery on the CS lead to the buffer register. BR2 (FIG. 14) extends the ground (Point 1) through the CL1 relay to CO and further extends leads S, C7, C4, C2, C1, 2, O, STM and BR to the buffer register.

d. Seizure or Buffer Register 1BR

Digressing briefly, the memory system, being common to 30 Toll Recording trunks, must have a relatively short holding time during each occupancy. It is therefore necessary to provide buffer registers wherever the accumulation of data or the use of data requires any appreciable amount of time.

Each Toll Recording Trunk has access to a pool of address registers (called no.) Reg TT through a cross bar link. As described above the called number is transmitted to the Reg TT register from the originating register - sender, in code form. The accumulation of this data requires approximately 11/2 seconds. After the called address has been received and stored in the register, an identification buffer register 1BR is seized and the calling number stored. When the 1BR and RTT registers have both been filled, the memory system is seized and the information is transferred from the buffer register and the RTT to the Memory. The RTT and 1BR registers and the Memory are then released from the Toll Recording Trunk. The information is now stored in the memory cores and the RTT and 1BR registers are free to serve other Toll Recording Trunks. The called address is, of course obtained from the information dialed by the subscriber while placing the call. The calling address and category is obtained through the use of a Line Identifier. If the call originated from a line within the local office, the line identifier used, is part of the recording system and will "crash" the complete calling address into the Register. If the call is originated in a remote office, the calling address is transmitted, via multi-frequency signalling, to the 1BR register through the MF receiver.

The buffer register is seized when a battery is present on the CS lead (FIG. 16) to operate CP via an ALI guard. CP closes ground to operate CBC, OA, OBC, SAB, and SCD (FIG. 16) which present the storage relays C20-C27, C30-C37 (FIG. 19), 010-017 through 070-077 (FIG. 20) to the ALI and also applies master triangle ground (FIG. 19, upper right hand corner) to various parts of the circuit. CP also presents the PO-P7 leads (FIG. 16) to the ALI. C1 operates to triangle ground (FIG. 16) through the normally operated CM relay and closes a path to the ODO and OD1 leads (FIG. 19). Ground on the C1 and CO leads from the Reg TT (FIG. 14) operate C10 and C11 (FIG. 19).

The ALI (shown in FIG. 1) when seized presents tone to the sleeve of S lead (FIG. 16) which is individually jumpered in a core panel (shown in FIG. 1) for the identification of the directory number and category of the calling telephone. The identification made, the information is presented to the storage relays in the IBR (FIGS. 19 and 20) via the ALI. In the present example, the Hotel subscriber from recorder office is category 32. The category 32 and directory number being stored in the storage relays of the 1BR, CPR operates (FIG. 16) via contacts of C22 and C21. CPR releases CP (FIG. 16) which in turn releases connect relays CBC, OA, OBC, SAB, and SCD releasing the ALI. CPR also releases CM (FIG. 16). CM on release operates DC (FIG. 16) which prepares a path to the STM lead (FIG. 17).

e. Preparation of Memory Core Stack to Receive Digital Information

Digressing briefly, the memory system uses ferrite cores for bit storage and conventional telephone type relays for "address" and "control" logic.

Three 64 .times. 64 bit planes are provided in each memory system for a total of 12,288 cores or bits. A digit is identified by a two out five code requiring 5 bits or cores per digit. Thus with reference to FIG. 74 one horizontal line in the memory plane contains 60 bits or space for one 12 digit word. Each Toll Recording trunk such as TRT-0 is assigned five of these horizontal lines or a total of 300 bits. This adds up to 9,000 bits that are used in the memory system and the standard 64 .times. 64 array will leave eight horizontal lines unused for trunk storage space. Five of these lines are available for test purposes and the remaining three can be used as spares and wired to any address should one of the assigned horizontals become damaged and fail to function.

Basically, the memory operates in a linear select mode. Each Toll Recording Trunk such as TRT-0 has its own address relay switch TC1 which connects five common, horizontal select relays. After a horizontal is selected, 60 cores are chosen in which either a `read` or `write` function may be performed. Sense Amplifiers are connected to the vertical wiring in the planes and the planes are connected in series such that each single vertical connection will pass through one row of all 3 planes and terminate at the sense amp. There are 60 Sense Amplifiers (five per Printed Circuit Module) of which each is connected to a vertical. The selection of a 12 digit word for a particular toll recording trunk is possible by simply operating the trunk address relay such as TC1 and one of five horizontal select relays such as H1A-H5A, as is clearly apparent from FIG. 72.

The table below indicates the various functions that are applied to the cores in the memory. Plus and minus signs indicate directions of the current applied.

Horizontal and vertical currents of +2/3 are called half-write current (1/2 Write). The total current required to set the core is set forth by the manufacturers specification of that core. In the total column are the current magnitudes generated at the core. A total of +1 will set the core in the `one` state. A total of -1 current (in the opposite direction of the `Write` current pulse) will return the core to the `zero` state. The WRITE A and B condition always exists since only one horizontal is activated at the time and a two out of five code will only activate a maximum of 24 out of 60 available verticals. A total of one-third current will not set the core to the `one` state. The inhibit current provides enough margin to prevent a core from falsely switching.

TABLE 1

Function Horiz. Vert. Inhibit Total __________________________________________________________________________ WRITE +2/3 +2/3 -1/3 +1 READ -1 0 0 -1 WRITE (A) +2/3 0 -1/3 +1/3 WRITE (B) 0 +2/3 -1/3 +1/3 __________________________________________________________________________

READ-WRITE SEQUENCE

1. Select desired horizontal.

2. Apply power (-24V) to sense amps corresponding to digits that are to be retained upon reading. Power is not applied to sense amps for digits that are to be erased (where new digits are to be written in, for example). The "function" relays control this selective application of power.

3. Apply "read" current to the horizontal. All cores in that horizontal are now erased. Digits which were to be saved are stored on the relays in the sense amps to which power had been applied; digits corresponding to unpowered sense amps are lost.

4. Apply power to all sense amps to prepare for entering new digits into the sense amps which previously were unpowered.

5. Enter any new digits into the sense amps by grounding the desired "in-out" leads.

6. Apply "WRITE" current. (HS lead) The digits which were saved upon reading (steps 2 and 3) plus the new digits that were entered (steps 4 and 5) are now written into the cores. Parity check occurs at the same time that the digits were written.

Remove power from all sense amps to release their relays before proceeding with the next read-write cycle.

At this juncture, it is necessary to refer to FIGS. 6, 7, 8 and 9 which will disclose how individual circuits and functions are identified to ultimately prepare the memory core stack for entrace of digital information.

With reference to FIG. 6 the TRT-0, RRL switch, RTT or Reg TT, IBR and CSC are shown thereat. In considering the buffer register function at this time, reference is made to the IBR where the CM relay is released to close a path between the MIR lead and BFR lead. Assuming the call is from the TRT-0 1, ground is presented at 28, 27 break contacts of TG1, through the break contacts of TG2 through TG31 through normally operated contacts of TGC, T01 and T02 through the coil of TG1, make contacts of LO relay in the TRT-0, through the crosspoints of the RRL switch, make contacts of PRG-1 and BR2 of the Reg TT to 11, 12 break contacts of CM in the IBR, presenting a low resistance 200 ohm ground to the BFR lead. The BFR lead is extended to the coil of F5 (FIG. 9), through the coil of F5, presented to the coil of BFR, through the make contacts of normally operated FGC and TGC to battery, operating only F5. F5 operates BFR. BFR operated causes the release of FGC preventing attempted seizure from another circuit. FGC released, presents -35V through the Zener diode to the BFR lead to operate TG1 which releases TGC. F5 remains operated by the voltage difference.

TGC, on release, applies master triangle ground to various parts of the circuit. TG1 operates corresponding TC1 relay (FIG. 74). BFR operates BF1 and BF2 (FIG. 50) and BGD (FIG. 55). BGD, on operating, closes master triangle ground (FIG. 52, bottom right hand corner) to the ERS lead. Ground on the ERS lead activates the erase memory card (FIG. 72) causing all information associated with that particular TRT-0 to be erased from the memory core stack.

BGD operates H1 and H1A (FIG. 52, master triangle ground, bottom right hand corner). BF1 and BF2 closes the odd and even leads and CH lead to the IBR (FIG. 63). H1 and H1A close a path to operate S1 (FIG. 58) and DC1, DC2, and DC3 (FIG. 50). DC1, DC2, and DC3 prepare paths to the category decoder (FIGS. 67 and 71). S1 closes the SLV lead (FIG. 54) from the TRT-0, via the transmit amplifier to the check register card (FIG. 70). S1 operates C1 (FIG. 57) and grounds READ lead to the Read-Write card (FIG. 72) to prepare the core stack (FIG. 69). Specifically, battery is extended over the coil of C1 (FIG. 57) break contacts 21, 22 of TRA, break contacts DPR, TBL, HTL, CLT, C2 through C12 (400 ohm resistor and parallel break of S2, FIG. 58) out the 31 lead (FIG. 57) to FIG. 51, make contacts 34, 33 of BGD (FIG. 51, upper center) through break contacts 22, 21 of S2 out read lead (which terminates in FIG. 72) and from 22 contact of S2 out the H lead through FIG. 57 to FIG. 58, make contacts 15, 16 of S1, break contacts 16, 17 of FN, through the make contacts of H1 and H1A to ground on the break contact of N.

C1 (FIG. 57) operates and closes a path (contacts 31, 32) to operate S2 (FIG. 51). Relay S2 closes make contacts 12, 13 (FIG. 58, lower left hand corner) to operate E and C2 (FIG. 57) in series. S2 also closes -24V (FIG. 62) to the sense amps via the parity check cards (FIG. 69, A1-12) and removes ground from read lead (FIG. 51). H1 operated closes ground (FIG. 71) to the parity check cards (FIG. 69, B1-12) thereby preparing all parity check cards for detection of any errors.

Digressing briefly, each parity check circuit checks for two out of five bits to be present per digit. It should be understood that the parity check circuit can not check for the correct numerical value of the digit, but only the fact that two bits must be present. An 0, 1, 3, 4, or 5 out of 5 code will be detected as an error by the parity circuit, the output of which will signal other circuits in the System. In some cases, a zero out of five will indicate correct parity which will be discussed later.

f. Storage of Category Digits in Sense Amp

C1 operated, closes the ODD-OD7 leads (FIG. 64) to the D1 lead which comprises five wires to sense amp 1 (FIG. 69) and the previously prepared path (DC1, FIG. 67) to the category decoder (FIGS. 75, [76], -80). At this time, the first digit of the category is stored in the sense amp (FIG. 69). Operating in parallel with C2 (FIG. 57) is the second stepping chain relay in the IBR (C2, FIG. 16) which closes the second digit of the category (FIG. 19) to the EVO-7 leads. C2 closes the EVO-7 leads (FIG. 64) to the D2 lead which comprises five wires to sense amp 2 (FIG. 69), and the previously prepared path (DC1, FIG. 67) to the category decoder.

C2 releases C1 (FIG. 57) which is also occurring in the IBR (FIG. 16). The release of both C1 relays release E. E released operates O (FIG. 57). O operates C3 (FIGS. 57 and 16). The relay chains in the IBR and memory continue to operate in the previously described manner causing the digital information including the calling number to be transferred from the IBR to the sense amplifiers. At the same time, D1, D2 and D3 (category digits) and D11 and D12 (class and type digits) have been presented to the category decoder (FIG. 67). The category decoder (FIGS. 75-80) receives the digital information presented on the D1, D2, D3, D11, and D12 leads (FIGS. 76 and 77) and operates relays H0, H1, T1, T2, UO and U2 (FIG. 76), CLO, CL1, CO and C2 (FIG. 77) which hold to their own make contacts to master triangle ground supplied by the memory (FIG. 67) which operated A (FIG. 76) on seizure.

g. Transfer of Category and Class and Type Information from Sense Amp to Memory Core Stack

When stepping chain relay C12 operates, C11 releases (FIG. 57) and 0 operates in series with DW (FIG. 58). DW closes ground to the read-write card (FIG. 72) on the HS lead which activates the memory core stack (FIG. 69) for TRT-0 No. 1, horizontal one via contacts of H1A and TC1 which then receives the digital information stored in the sense amps. Read-write card also completes the necessary sequence to completely enable the parity check cards (FIG. 69) to detect any errors, via the EN lead. DW also closes ground to the ECF lead (FIG. 67) to enable the code fan in the category decoder. Ground on the ECF lead in the category decoder operates ECF (FIG. 76). ECF closes ground (FIG. 80, bottom right hand corner) to the contact fan of the H, T and U relays and ground 15, 14 over make contacts of ECF, 32, 33, make contacts of previously operated T1, 13, 14 make contacts or previously operated T2 out the 3 lead to FIG. 77 and the coil of CA1 and CA2 energize relays CA1, CA2 which operate. The same originating ground (FIG. 80, bottom right hand corner) is extended to the RRO lead via 15, 14 make contacts of ECF, 32, 31 break contacts of T0, break contacts 32, 31 of T7, make contacts 14, 13 of U0, make contacts 25, 26 of U2 to the RRo lead, and also through resistance to the CTM lead. The RRO lead will ultimately cause the TRT-0 to call for an idle TSD position. The CTM lead (FIG. 80) is extended to the TRT-0 (FIG. 102) via the operated TG1 relay (FIG. 54) to operate TC relay in the TRT-0 (FIG. 93).

DW relay also operates H2 and H2A (FIG. 52) which, when operated, opens the path holding S2 (FIG. 57) and C12 (FIG. 57). C12 releases 0 (FIG. 57) and S2 releases H1 and H1A (FIG. 52). H2A releases DC1, DC2, and DC3 (FIG. 50), operates H2B (FIG. 50) and releases BF1 and BF2 (FIG. 50). DC1, DC2, DC3 opens the odd and even leads to the category decoder (FIG. 67). BF1 and BF2 opens the odd and even leads to the IBR (FIG. 63). H1 and H1A (FIG. 58), on release, operates C1 (FIG. 57).

FIG. 17, upper right hand corner, shows master triangle through contact 11, 12 breaks of CL (FIG. 17) which correspondly operated and released with C11 (FIG. 57) in the memory, make contact 21, 22 of TY (FIG. 17) which correspondly operated with C12 (FIG. 57) in the memory, to the BRF lead to FIG. 14, to operate M2. M2 operates M1 (FIG. 14) which closes various paths to the memory (FIG. 11 and 15). During the sequenced stepping of the IBR chain, STM (FIG. 11) was operated via make contacts of DS, C3, and 02 (FIG. 17) to release RA12 (FIG. 11) and present the OD and EV leads to the RA chain. STM opens the paths to the OD and EV relays (FIG. 11).

h. Storage of Digits of Called Number in Sense Amp

RA1 (FIG. 11, Seg. 3) operated through make contacts of STA, break contacts of the RA1-RA12 chain, make contacts of M2 relay to CH lead to memory, which has ground presented by break contact 14, 15 of S2 (FIG. 58).

C1 (FIG. 57) operates S2 and S2 closes a path (FIG. 58) to operate E and C2 (FIG. 57) and RA2 (FIG. 11) in series. S2 also closes -24V (FIG. 62) to the sense amp via the parity check card (FIG. 69, A1-12) and removes ground from read lead (FIG. 56). H2 operated closes ground (FIG. 70) to the 4-6 lead and closes `411` check register card (FIG. 69) to 7 and 8-10 leads to the parity check cards (FIG. 69, B1-12) thereby preparing parity check cards 4 through 12 for detection of errors. C1 operated close the 0D0-0D7 leads (FIG. 64) to the D1 lead, which is five wires, to sense amp 1 (FIG. 69). At this time, the first digit of the called number is stored in the sense amp.

C2 operated closes the EV0-EV7 leads (FIG. 64) to the D2 lead, which if five wires, to sense amp 2 (FIG. 69) where the second digit is stored. C2 releases C1 (FIG. 57) while RA2 releases RA1 (FIG. 11) in the Reg TT. The release of C1 and RA1 release E (FIG. 57). E released operates 0 which operates C3 (FIG. 57) and RA3 (FIG. 11), and the digits are thereby stored in the sense amps including the Reg TT number (FIG. 15).

When M1 is operated (FIG. 15), the R0 lead is closed to the memory. The R0 lead becomes the RR0 lead (FIG. 65) to the category decoder which presently has ground potential. This ground on the R0 lead (FIG. 15) is presented to the coil of C14 (FIG. 12) which releases CL2 and starts the slow release of CL1 (FIG. 12). CL4 closes ground (FIG. 10) to the R0 lead to the TRT-0 (FIG. 84) to operate R0F (FIG. 101). When stepping chain relay C12 (FIG. 57) and RA12 (FIG. 11) operate, C11 (FIG. 57) and RA11 (FIG. 11) release. 0 relay again operates in series with DW (FIG. 58).

i. Transfer of Digits of Called Number to Memory Core Stack

DW closes ground to the read-write card (FIG. 72) which again activates the memory core stack (FIG. 69) for TRT-0 No. 1, horizontal two, via contacts of H2A and TC1, which then receives the digital information stored in the sense amps. The read-write card also completes the necessary sequency to completely enable the parity check cards via the EN lead to check for errors. The same DW ground (FIG. 58) operates FNA which operates FN (FIG. 52), the circuit for FNA extends from the coil of the FNA, through make contacts of BGD, through break contacts of DT, AT, QC, RFG, MCT, DPB, DPG, DPD, TCG, through the diode to the HS lead to FIG. 58, through 100 ohm resistance, make contacts of DW to ground.

FNA (FIG. 52) operates and closes its 17, 18 make contacts to the coil of FN. FN operates and holds through 12, 13 make contacts to master triangle ground, and at its contacts 17, 16 (FIG. 58) releases S2 (FIG. 51). S2, on release, releases 0 (FIG. 57) and C12 (FIG. 57) and RA12 (FIG. 11). C12, on release, opens the path to DW (FIG. 58). DW removes the ground to H2 and H2A (FIG. 52). H2 and H2A, on release, opens the path to S1 (FIG. 58) which, on release, closes a ground (FIG. 52, bottom right hand corner) through the make contacts of FN to the FN lead. FN becomes RF (FIG. 54) to the Reg TT (FIG. 14). Ground on RF (FIG. 14) knocks RF relay down.

j. Call Collapse including Sender Disconnect, and Reg TT and Memory Release

FIG. 10 shows +48V being extended to the T lead via contacts of operated CL4, released CL2, operated CL1, released BLK and operated P. +48 on the T lead via the TRT-0 to the sender-0 causes the sender to disconnect. RF, on release, cause BR1 and BR2 (FIG. 13) to release disconnecting IBR (FIGS. 16-21).

CL1 (FIG. 10) at end of slow to release closes -48V to RF lead to TRT-0 (FIG. 84). -48V on RF lead operates RF (FIG. 88) which opens CS lead (FIG. 93, upper left hand corner) removing the call signal to the RRL switch. The RRL switch releases opening the crosspoints between the TRT-0 and the Reg TT, opening all the leads on FIG. 10 causing the release of the Reg TT, also opening the MGA lead (FIG. 6) and releasing TG1 (FIG. 6) which releases F5 and BFR (FIG. 9) closing a path from battery (FIG. 9) to operate FGC (FIG. 6). FGC operates TGC (FIG. 6) which removes master triangle ground (FIG. 74). Removal of master triangle ground causes the release of the memory (FIGS. 50-74) and the category decoder (FIGS. 75-80).

k. Connection of TRT-O to an Idle TSD Position

R0F (FIG. 101), when operated by the R0 lead from the Reg TT (FIG. 84), operates R0A (FIG. 95). RF (FIG. 87), being operated by -48V on the RF lead from the Reg TT, releases RC (FIG. 84). The sender-0, having been previously disconnected, removes ground from the C lead (FIG. 87), releasing ON (FIG. 87), which operates NC (FIG. 90) over a circuit extending via coil of NC, break contacts of WA, break contacts of W, break contacts SFA, make contacts of previously operated ROF, break contacts AC, make contacts of previously operated RF, break contacts of released ON, break contacts of BLK to triangle master ground (FIG. 89). ON releases C1 (FIG. 88). C1, on release, releases C1A (FIG. 88). ON, on release, extends T and R leads, GS outlet (FIG. 103), which now have the subscribers's loop attached and operates A relay (FIG. 103). A operates MB (FIG. 101). NC on operating signals the TSD link marker with a non-priority call signal to connect this TRT-0 to an idle TSD position control circuit. The TSD link marker signals the TRT-0 to connect the memory for classification of the call, which is used to train new operators by excluding certain predetermined types of calls from the training positions. The marker presents a ground, via the ASW switch, to the SPQ lead (FIG. 104) to operated LCM (FIG. 100).

1. Derivation of Queue Class Function (QC)

Referring to FIGS. 6, 7, 8, and 9, the derivation of the Queue Class function in the memory from the TRT-0 (FIG. 6) is now described. As will be shown, the Queue class function in effect permits restriction of certain types of calls from entering trainee position. Simultaneously a rate function is provided wherein if a coin box call is in progress, the Queue function would have been replaced by a rate function, the equipment being operative to provide a rate code into the memory being used for the call.

More specifically, ground, through the coil of TG1 (FIG. 6), make contacts of LCM (FIG. 6) and break contacts of CB is presented to the QC lead. QC lead to the coil of F4 (FIG. 9) through normally operated contacts of FGC and TGC to battery. F4 operates QC. QC releases FGC which closes -35V from the Zener diode (FIG. 9) to the QC lead to operate TG1. TG1, when operated, extends ground to the FN lead (FIG. 54). FN lead in the TRT-0 (FIG. 81) operates the FN relay (FIG. 81). F4 remains operated to the voltage difference.

TG1 operated causes the release of TGC preventing attempted seizure from another circuit. TGC, on release, applies master triangle ground to various parts of the circuit. TG1 operates the corresponding TC1 relay (FIG. 74). QC operates H1 and H1A (FIG. 52) from master triangle ground extended via break contacts of S1 (FIG. 52, bottom right hand corner). H1 and H1A hold to their own make contacts, and operate S1 (FIG. 58) DC1 and DC3 (FIG. 50). DC1, DC2 and DC3 prepare paths to the category decoder (FIGS. 67 and 71). S1 closes the SLV lead (FIG. 54) from the TRT-0 via the transmit amplifier to the check register card (FIG. 70) and category decoder.

QC closes -24V (FIG. 60) to the sense amp via the parity check cards (FIG. 69, A1-12) while ground is still being presented to the read lead via break contacts 21, 22 of S2 (FIG. 51) which causes the information in the memory core stack to be transferred and stored in the sense amp which presents the digital information to the D1 through D12 leads. The information on leads D1, D2, D3, D11 and D12 is then stored in the category decoder via the previously prepared paths of DC1, DC2 and DC3 (FIG. 67).

S1 operates S2 which opens the READ ground (FIG. 51). On the QC function, the C1 through C12 chain is not operated. S2 further closes -24V (FIG. 62) to the sense amps via the parity check cards (FIG. 69, A1-A12). H1 closes ground (FIG. 71) to the parity check cards (FIG. 69, B1-12), thereby preparing the parity check cards for detection of any errors. S2 closes ground (FIG. 58, bottom left hand corner) through make contacts 17, 18 of QC to the S2B lead (FIG. 67) to the category decoder.

S2B lead (FIG. 76) operates QR. A was previously operated by master ground on the MG lead supplied by the memory. QR starts the slow release of normally operated QF (FIG. 76). QF, on release, closes a path to S2C (FIG. 76), S2C lead (FIG. 67) through break contacts of RFG to the ECF lead (FIG. 67) to the category decoder which operates ECF (FIG. 76) applying master triangle ground (FIG. 80, bottom right hand corner) to the contact fan of the previously operated H0, H1, TL, T2, U0, U2 relays which extend the ground to the H1 + lead (FIG. 80) onto the 4 lead, through the diode to strapping point 14 (FIG. 79). Strapping point 14 may be connected to any of the CL strapping points (FIG. 75) thereby operating Q relays. Make contacts of the operated Q relays (FIG. 79) close sync pulses to the SLV lead (FIG. 80) to the memory. SLV lead (FIG. 67) is extended to the TRT-0 via the transmit amplifier (FIG. 54) to become the SL lead. SL lead (FIG. 102) becomes the FS lead or front sleeve. FS is extended through make contacts of previously operated LCM (FIG. 100) and break contacts of OGT (FIG. 100) to the SPQ lead (FIG. 104) which originated this sequence from the TSD link marker. The TSD link marker receives the sync pulses and translates the pulses to call classification information for the purpose of excluding predetermined types of calls from training positions.

Meanwhile, the ground closed through by S2 (FIG. 58, bottom left hand corner) which was extended by the release of QF (FIG. 76) to the ECF lead (FIG. 58) is also presented to the HS lead (FIG. 58) to the read write card (FIG. 72) which completes the necessary sequence to enable the parity check cards (FIG. 69) to detect any errors and transfer the information back to the core stack.

The same ground on HS lead (FIG. 58) is extended into FIG. 52 where it will further hold H1 and H1A and is extended through make contacts of QC (FIG. 52, upper center) to operate FNA. FNA operates FN which at its contacts 17, 16 (FIG. 58) release S2 (FIG. 51). S2 at its contacts 15, 16 (FIG. 58, bottom left hand corner) removes the ground from the ECF and HS leads (FIG. 58) causing H1 and H1A (FIG. 52) to release. H1 and H1A, on release, open the path to S1 (FIG. 58) which, on release, closes a path from master triangle ground (FIG. 52, bottom right hand corner) to the FN lead.

The FN lead is extended through make contacts of the QC relay (FIG. 54) to become the QCF lead to the TRT-0 and MC1 which is the marker class identifier. The QCF lead in the TRT-0 (FIG. 102) is extended through make contacts of FN and LCM (FIG. 100) to knock LCM down (FIG. 100). LCM, on release, opens the QC lead (FIG. 6) which releases the F4 and QC relays (FIG. 9) and further releases TG1 (FIG. 6) which opens the ground holding FN (FIG. 81). QC, on release, closes a path from battery (FIG. 9) to operate FGC (FIG. 6). FGC operates TGC which removes master triangle ground from the various parts of the memory circuit causing the release of the memory and the category decoder.

m. Connection of TPC to TRT-0

The crossbar switches ASW, BSW, and CSW are conventional crossbar switches and are now operated by the TSD link marker to connect the TPC to the TRT-0.

The idle position control circuit, having been connected to the requesting TRT-0 via the ASW, BSW, and CSW crossbar switches, the CTR, RS, T, R, and FS leads (FIG. 104) of the TRT-0 are now connected to the position control circuit. The FS lead (FIG. 32, left center) through PR break contacts, FB and FK break contacts to FL1 coil and through the FS1A coil to -48v prepares FL1. FS lead (FIG. 104) through FS coils (FIG. 100) in series to ground operates FS (FIG. 100) and FS1A (FIG. 32). FS (FIG. 100) operating shorts its own high resistance coil thereby operating FL1 (FIG. 32). FL1 causes CLD supervision lamp (FIG. 47) to light. FS1A operates FS1 (FIG. 32). FS relay in the TRT-0 closes ground (FIG. 87) to operate the SFA (FIG. 92) which operates SFB (FIG. 92). SFA releases NC (FIG. 90) by opening master triangle ground (FIG. 89). NC, on release, removes the demand from the TSD link marker causing the marker to release. RS lead (FIG. 104) to RS coils in series (FIG. 98) to ground operates the RS relay. RS lead (FIG. 46) is also connected through break contacts of PR, through the CLG supervision lamp and 800r in parallel to battery, but due to the high resistance coils in series, the CLG lamp will not light.

FS1 in the position control circuit operates LG1 (FIG. 32) over a circuit extending from battery over the coil of LG1 through make contacts of FS1 (FIG. 31) break contacts H1 (FIG. 31) through series break contacts of LC1, LC2, LC3, and LC4 (FIG. 32) through break contacts of PR to ground. LG1 applies triangle ground to various parts of the circuit. LG1 operates LC1 (FIG. 47) and closes 120 1PM (FIG. 36) to the ACS lamp (FIG. 35). LG1 releases normally operated PI (FIG. 23). Time start lamp (FIG. 32) lights read to master triangle ground indicating time has not started. RTO relay (FIG. 29) operates to master triangle ground. D relay (FIG. 28) operates to master triangle ground NTM relay (FIG. 29) operates to master triangle ground. KPD relay (FIG. 24) operates from the coil to FIG. 25, through FIG. 29 out the KD to FIG. 34 to FIG. 30, through series break contacts of keys KP TBL, KP NFY, KP CG, KP CD, KP SPL, KP RT, PER PAID, PER COL, PER SPL CLG, PER SPL CLD, PER NO CHG, STA AUTO COL, STA SPL CLD, STA SPL CLG, STA COL, STA PAID, KP GST, break contacts of TM relay, break to TR, break to NS to master triangle ground.

n. Memory Scan for Operator Lamp Indication

At this time the TPC via the TRTO effects a memory scan over a route which by passes the ASW, BSW and CSW switches. That is, master triangle ground described above operates CM relay (FIG. 24) in parallel with KPD through further break contacts to battery. CM holds through its own make contacts to battery. CM operates PG1 and PG1A (FIG. 49). PG1 closes ground to CM lead (FIG. 48) and also closes sync pulses (FIG. 46) via the transmit amplifier to the RS lead to the TRT-0. RS lead (FIG. 104) through FIG. 99, FIG. 100, FIG. 105 to the receiver amplifier (FIG. 106) and the receiver which convert the sync pulse to a ground potential to be presented on lead LK1. The LK1 lead is extended through FIG. 105 to FIG. 100 to operate LK1 relay. The CM1 lead (FIG. 83) is extended through make contacts of LK1 (FIG. 82) to operate CM relay (FIG. 82). CM holds to its own make contacts. CM, on operating, (FIG. 93, lower right hand corner) extends a momentary ground through continuous transfer contacts 16, 17, 18 during bunching time through FIGS. 88, 85, 86, to FIG. 83, make contacts Lk1 to the FR lead (FIG. 83). FR lead (FIG. 49) is extended through make contacts of PG1A to operate FR (FIG. 49). RF, on operating, releases PG1 and PG1A (FIG. 49) to remove the ground from the CM lead (FIG. 48) and also to remove the sync pulse (FIG. 46) from the RS lead. Sync pulse removed from the RS lead (FIG. 104) causes the receiver amplifier and receiver (FIG. 106) to remove ground potential from the LK1 lead releasing LK1 relay (FIG. 100).

Referring again to FIGS. 6, 7, 8, and 9, CM operated again extends the ground originating through the coil of TG1 to the MS lead (FIG. 6). MS lead (FIG. 9) operates F2 which operates MS (FIG. 9). MS releases FGC which closes -35V from the Zener diode (FIG. 9) to the MS lead to operate TG1 (FIG. 6). TG1, when operated, extends ground to the FN lead (FIG. 54). FN lead in the TRT-0 (FIG. 81) operates the FN relay (FIG. 81). F2 (FIG. 9) remains operated to the voltage difference. TG1 operated causes the release of TGC preventing attempted seizures from other circuits. TGC on release applies master triangle ground to various parts of the circuit. TG1 operates the corresponding TC1 relay (FIG. 74).

o. Transfer of Information from Sense Amps to Category Decoder

The equipment is now operative to effect transfer of the information in the sense amplifier to the category decoder for the purpose of providing kind of call information to the TSD position. More specifically, MS operates H1 and H1A (FIG. 52) from master triangle ground extended via break contacts of S1 (FIG. 52, bottom right hand corner). H1 and H1A hold to their own make contacts. H1 and H1A operate S1 (FIG. 58) and DC1, DC2, and DC3 (FIG. 50). DC1, DC2, and DC3 prepare paths to the category decoder (FIGS. 67 and 71.

S1 closes the SLV lead (FIG. 54) from the TRT-0 via the transmit amplifier to the check register card (FIG. 70) and the category decoder (FIG. 67). MS closes -24V (FIG. 60) to the sense amps via the parity check cards (FIG. 69, A1-12) while ground is still being presented to the READ lead via break contacts 21, 22 of S2 (FIG. 51) which causes the information in the memory core stack to be transferred and stored in the sense amps which present the digital information to the D1 through D12 leads. The information on leads D1, D2, D3, D11, and D12 are then stored in the category decoder via the previously prepared paths of DC1, DC2, and DC3 (FIG. 67), causing the information stored in the sense amp to be stored in the category decoder. S1 operates S2 (FIG. 51) which opens the READ ground. On the MS function, the C1 through C12 chain is not operated. S2 further closes -24V (FIG. 62) to the sense amps via the parity check cards (FIG. 69, A1-12). H1 closes ground (FIG. 71) to the parity check cards (FIG. 69, B1-12) thereby preparing the parity check cards for detection of any errors. S2 closes ground (FIG. 58, bottom left hand corner) through make contracts 24, 25 of MS to the ECF lead and HS lead. ECF lead to the category decoder (FIG. 67) operates ECF (FIG. 76) thereby presenting ground (FIG. 80, bottom right hand corner) to the contact fan of the previously operated H0, H1, T1, T2, U0, and U2 relays. The ground extended by the previously operated relays becomes the H1+ lead to FIG. 79 and becomes the 4 lead to FIG. 76 where it operates K3. The same ground through the contact fan also becomes the 3 lead to FIG. 77 operating CA1 and CA2. K3, CA1 and CA2 closes sync pulse 3, 6, and 7 respectively (FIG. 79) to the SLV lead which is extended to the position control circuit via the TRT-0. Also, master triangle ground (FIG. 78, bottom right hand corner) is extended through the previously operated contact fan of C0, C2, CL0, and CL1 to become the 1 lead which operates TC0 and TC1 (FIG. 77).

TC1 and TC0 extend sync pulses R8 and R9 (FIG. 79) to the SL lead which is extended to the position control circuit via the check register card (FIG. 70) lead through the TRT-0. Ground presented over the HS lead (FIG. 58) to the read WRITE card (FIG. 72) completes the necessary sequence to enable the parity check cards (FIG. 69) to detect any errors and transfer the information back to the core stack.

p. Transfer of Information from the Core Stack Horizontal to the Sense Amps

The same ground operates H2 and H2A. From the coils of H2 and H2A through break contacts of EM and DPR, make contacts of H1, series break contacts of DT through TCG to the HS lead (FIG. 58). H2 and H2A cause the release of S2 which releases H1 and H1A. H2A releases DC1, DC2 and DC3 (FIG. 50) which opens the D1, D2, D11 and D12 leads to the category decoder. S2, on release, grounds the read lead causing the information stored in the second horizontal of the memory core stack to be transferred and stored in the sense amps (FIG. 69).

S2 operates (FIG. 51) removing ground from the read lead and presenting ground to the HS lead which again completes the necessary sequence to enable the parity check cards to detect any errors and transfer the information back into the memory core stack. S2 operates H3 and H3A which releases S2 which in turn releases H2 and H2A. S2, on release, grounds the read lead causing the information (if information had previously been entered) in the third horizontal to be transferred and stored in the sense amps.

At this time ground is not presented to the parity check cards (FIG. 71) on the B1-12 leads since it is not anticipated that any information will be received from the horizontal which contains the special billing information for third number or credit card (i.e. not pertinent to this exemplary call). If the class type had been such that a third number or credit card number would be required, the category decoder would have presented ground to the BG lead (FIG. 71) causing an error to be detected, and a signal (sync pulse) to be sent to the position control circuit via the TRT-0 on the SLV lead causing the KP SPL lamp to light at the operator position.

H2 and H2A, on release, operate S2 which removes the ground from the read lead and grounds the HS lead. Ground on the HS lead operates H4 and H4A, which releases S2. S2, on release, again grounds the read lead, releases H3 and H3A, and the information (if previously entered) is removed from the core stack and stored in the sense amps.

S2 operates on the release of H3 and H3A grounding the HS lead. The parity is checked on leads B2-6 and 7. Errors detected on the leads when the memory is attached to the clock and calendar would transfer the clock (however such operation is not pertinent at this time). S2 operates H5 and H5A which releases S2. Ground applied to the read lead causes information (if previously entered) to be transferred and stored in the sense amps. The category decoder having presented a ground on the GG lead (FIG. 80) via the contact fan of the previously operated and held U2 and U0 relays.

q. Guest Number Verification

At this time the system checks for the presence of a guest number in horizontal S verticals 7-10. If the number had been entered, no error will be detected. Assuming however that the number has not been entered at this time, the GG lead (FIG. 71) being extended through make contacts of H5 (FIG. 71) now presents ground to the B7 and 8-10 leads thereby enabling the parity check cards 7 through 10 to detect an error. (Leads 2-6 check the clock when attached). H4 and H4A release operating S2, applies ground to the HS lead causing an error to be detected. Absence of information in sense amps 7 through 10 cause parity check cards 7 through 10 (FIG. 69) to close ground to the C7 and C8-10 leads (FIG. 70) which is extended through make contacts H5A (FIG. 70) to become the GNE lead (Guest Number Error) to the check register card. The check register card causes sync pulse 18 to be connected to the SLV lead which will light the KP GST lamp on the operator position. Ground on the HS lead (FIG. 58) is extended into FIG. 52 to further hold H5 and H5a, and through make contacts of H5A to operate FNA. FNA operates FN, which with S1 closes sync pulse 15 (FIG. 54) to the SPA lead to the TRT-0. FN releases S2 which removes ground from the HS lead causing H5 and H5A to release. H5 and H5A open the path holding S1 which releases. S1 on release closes a path from master triangle ground (FIG. 52, bottom right hand corner) to the FN lead. The FN lead is extended through make contacts of the MS (FIG. 54) to become the MSF lead to the TRT-0. The MSF lead in the TRT-0 (FIG. 82) is extended through make contacts of FN and CM (FIG. 82) to knock down CM (FIG. 82).

Referring to FIGS. 6, 7, 8 and 9, CM, on release, opens the MS lead (FIG. 6) which releases F2 (FIG. 9) and MS relays, and also releases TG1 (FIG. 6) which opens the ground holding FN (FIG. 81). MS, on release, closes a path from battery (FIG. 9) to operate FGC (FIG. 6). FGC operates TGC which removes master triangle ground from the various parts of the circuit causing the release of the memory and category decoder.

The SLV lead becomes the FS (front sleeve) lead in the TRT-0. The various sync pulses which were extended from the memory to the position control circuit were received by receiver amplifier and receivers which in turn converted the pulses to ground potentials for operating various relays which hold to their own contacts. These will be explained in detail following the brief summary hereat the pulse originators.

Sync Effect Position Relay Circuit Pulse Control Pos. Lamp __________________________________________________________________________ KC3 Category Decoder 3 Kind-of-call STA HOTEL Relay KC3 AC1 & Category Decoder 6 & 7 AC1 & AC2 HN PA AC2 TCT0 Category Decoder 8 & 9 TCT0 & TCT1 (STATION) & PAID Green TCT1 GNE Memory 18 GST KP GST (lead) __________________________________________________________________________

The SPA lead becomes the RS (rear sleeve) lead in the TRT-0.

fn memory 15 MPA relay No lamps

Sync pulse connected by the TRT-0 to the RS (rear sleeve) lead are maintained by the operated relay in the TRT-0 and hold the relay in the position control.

Relay Circuit Sync Effect Position Pulse Control Pos. Lamp __________________________________________________________________________ ROF TRT-0 7 RLF relay (Release) FORWARD TC TRT-0 16 TAC relay T & C __________________________________________________________________________

the specific circuitry and mode of operation effected to operate the above relays to light the above lamps is now briefly set forth.

FS1 lead (FIG. 32) through break contacts of PR, make contacts of LC1, through break contacts of TR to the receiver amplifier and out the circle 5 lead appears on nine receivers associated with the front sleeve (FS) lead and are designated F1 through F9. In receiver F8 (FIG. 44) the circle 5 lead with sync pulse 3 will cause the KC3 relay to operate which holds through to own 16, 15 mak contacts to triangle ground. Also in receiver F9 (FIG. 44), circle 5 lead with sync pulse 6 causes AC1 relay to operate, holding through its own 18, 17 make contacts to triangle ground.

In receiver F4, (FIG. 42) circle 5, lead with sync pulses 7 and 8 cause AC2 and TCT0 to operate. AC2 holds to its own 16, 15 make contacts to triangle ground. Receiver F5, circle 5 lead with sync pulse 9 causes TCT1 to operate. TCT1 and TCT0, when operated, close a ground to operate TCH (FIG. 31). From the coil of TCH (straight down the page) through make contacts to TCT0 and TCT1, break contacts of TCT2, TCT4, TCT7 to FIG. 30, break contacts of 4A, 7A, to triangle ground. SPD (station paid) relay (FIG. 30) is operated by the same ground. FIG. 33 shows the station paid class charge lamp being lip green via make contacts of TCH and SPD relays. TCT0 and TCT1 release when the sync pulses are removed. FIG. 26 shows HNPA (home numbering plan area) lamps being lit through make contacts of AC1 and AC2. Hotel STA lamp (FIG. 26, lower left hand corner) is lit and CHS (FIG. 26) is operated through break contacts of KC4, make contacts KC3, break contacts of KC2, break contacts of KC1 and break contacts of EF to ground.

In receiver F3, (FIG. 31) circle 5 lead with sync pulse 18 operates GST relay (FIG. 30) which will hold to its own contacts.

KP GST lamp (FIG. 48) is lit through make contacts of GST to ground on FIG. 49.

Sync pulses on RS1 lead (FIG. 46) through break contacts of PR to the CG1 lead to FIG. 48 to and through the receiver amplifier, make contacts LC1, break contacts of TR to circle 4 lead appears on four receivers associated with the rear sleeve (RS) lead and are designated R1 through R4.

In receiver R1 (FIG. 25) the circle 4 lead with sync pulse 7 operates RLF. The REL FWD lamp (FIG. 47) is lit through make contacts of RLF to ground.

In receiver R4, (FIG. 44) circle 4 lead with sync pulse 16 operates TAC relay. The T & C lamp (FIG. 44) is lit through make contacts of TAC to ground.

In receiver R3, (FIG. 43) circle 4 lead with sync pulse 15 causes MPA to operate. MPA operates MP (FIG. 24) which holds to its own make contacts to the KD lead which has triangle ground. MPA releases when sync pulse 15 is removed from the circle 4 lead (RS1 lead). Sync pulse 15 was removed when S1 in the memory released as shown in FIG. 54. MP releases CM (FIG. 24) and CM releases FR (FIG. 49).

r. Display on TS0

Referring to FIG. 5, the operator now has displayed on her position all the necessary information as to the type and status of the call. The call originated in the home numbering plan area (HNPA lit white) (216); a hotel subscriber dialed a along distance DDD call (HOTEL STA lit white), and four digit room or guest number is required to complete the call (KP GST lit white). The call will have automatic time and charge on completion (T & C lit white), the calling subscriber is off-hook (CG lamp dark), the called subscriber is on-hook (CLD lit white), the forward progress of the call has not started (RELEASE FWD lit red), the calling and called numbers are stored in the memory (KPCG and KPCD lamps dark), timing of call has not started (TM ST lit red), the class charge is that of a station paid (STATION PAID lit green) and the operator has not accessed the call (ACS loop 1 flashing white). All other lamps are dark except for the time of day being displayed by the 24 hour clock in the upper right corner of the position.

s. Operator Access to Call

The operator seeing the type and status of the call depresses the ACS key (FIG. 31). ACS1 (FIG. 3) operates over a circuit extending from battery over the coil of ACS1 out the ACS1 lead to FIG. 35 to FIG. 36, through make contacts of LC1, through FIG. 32 to FIG. 31, through KA option (key access), ACS key depressed, through make contacts of LC1 to ground. ACS1 holds through its own make contacts FIG. 31, contacts 12, 13 to the PR1 lead to FIG. 32, through break contacts of PR to ground. The operator releases the ACS key.

ACS1 (FIG. 35) removes the 120 1PM and presents ground to the ACS lamp. The ACS lamp is now steady. ACS1 operates FK (FIG. 46, upper right hand corner). ACS1 closes the T & R through to a battery wetting circuit WC1 (FIG. 24) and also closes the operator headset to the T & R leads (FIG. 23). WC1 closed to T & R leads and the TRT-0 to cause OH in the TRT-0 to operate (FIG. 99). FK operates FB (FIG. 46, upper right hand corner). FB causes the slow release of FK (FIG. 46). FB and FK, being operated, remove battery from behind the coils of FS1A and FL1 (FIG. 32) to the FS1 lead to the TRT-0 (FIG. 32) which causes the release of the FS relay (FIG. 100). FS, on release, operates AC (FIG. 87). AC holds to rectangle 1 ground and operates ACA and ACB (FIG. 87). ACA operates SU (FIG. 94) which reverses the T & R toward the subscriber for supervision purposes (FIG. 103). FK, on release, extends battery again to the coils of FS1A and FL1 (FIG. 32) causing FS relay in the TRT-0 to operate (FIG. 100).

The operator is now connected to the subscriber and verbally requests the room or extension number. For this call, we will assume number 1,234 is to be entered into the memory. The operator depresses the KP GST key and contacts of the KP GST key open the holding ground from MP and KPD (FIG. 24) which were being held via the KD lead (FIG. 30, bottom left hand corner). Make contacts of KP GST key close a path to operate CAR (FIG. 27), over a circuit extending from battery over the coil of CAR (FIG. 27, bottom right hand corner) through make of KP GST key, make of GST, break of TCL, make GST, through series brakes of DAT, BH, DLT, DCG, DCD, DSPL, DRT to FIG. 28, break of STM, break of MPA to diamond master ground on normally operated TO relay (FIG. 29). Diamond master ground is from triangle ground (FIG. 47, top left hand corner). The KP lamp (reference FIG. 5) above the operators keyset lights red (FIG. 25).

The ground that operated CAR is extended through a break contact of KD (FIG. 27), make of CAR, make of GST to operate GSTR (FIG. 27). RP relay (FIG. 27) is operated by GSTR over the circuit extending from battery over the coil of RP through make contacts of CAR, parallel break contacts of NFR and FR, break of STM, break of ANFY, break of TCLR, make of GSTR, series breaks of KPR, SPLR, CDR, CGR, TBLR, NFR on the CAR lead through FIGS. 27, 28 to FIG. 29, through make contacts of CAR to ground. The GSTR holds to the same ground through its own make contacts (FIG. 27). The KP lamp above the operators keyset now turns to green and red goes dark (FIG. 25).

The operator releases the KP GST key which releases CAR that was holding through make contacts of the KP GST key (FIG. 27). RP operates RA 7 (FIG. 43) over a circuit which extends from battery over the coil of RA7, through make contacts of GSTR, series break contacts of RA7, RC, KPR, RA8, RA9, RA10, TBLR, TCLR, RA11, RA12, make contacts of RP, break contacts of CAR to the RP lead through FIGS. 37, 36, 35, 34, 29 to FIG. 28, break of STM, break MPA to diamond master ground.

t. Operator Keys in Guest Number

The operator now depresses the digit 1 key (FIG. 24, upper right hand corner) and FIG. 25, upper center). Battery over the coil of R1 (FIG. 24) through break of TF1, make of digit key 1, break of TF1 to the G lead, through FIG. 29 and 28 to FIG. 27, through break of MP to ground, operates R1. This is the ground behind the digit keys 1 through 0 (FIGS. 24 and 25). RO operates over the circuit extending from battery over the coil of RO to the 0 lead to FIG. 25, break contacts of TF1, through make contacts of digit key 1, break contacts of TF2 to G lead ground. RO and R1 operated cause D70 and D71 to operate (FIG. 39) to ground on the RP lead. RO and R1 release previously operate D (FIG. 28). D, on release, operates NS (FIG. 29). NS operates HG (FIG. 29) which places ground to the storage relays D1, through D12 (FIG. 39, bottom right hand corner). D70 and D71 (FIG. 39) hold to HG ground.

The operator releases digit 1 key (FIGS. 24 and 25) releasing RO and R1 (FIG. 24). RO and R1 close a path to reoperate D (FIG. 28). D closes a path from ground (FIG. 44, upper right hand corner) through break of ER, make of NS, make D, break of OD, through coil of EV relay, break of MP, break of STM, make of RA7, through coil of RA8 to -48V operating EV and RA8 in series. RA8 releases RA7.

The operator depresses digit 2 key which operates RO and R2 which open the path to D causing D to release. RO and R2 cause D80 and D82 to operate holding to HG ground. D, on release, causes EV to release. The operator releases digit 2 key. RO and R2 release causing D to operate. D causes RA9 and OD to operate in series and releases RA8.

The operator depresses digit 3 key, operating R1 and R2 which close a path to operate D91 and D92 which hold to HG ground. R1 and R2 cause D to release. D releases OD. The operator releases digit 3 key, releasing R1 and R2 which reoperates D. D causes RA10 and EV to operate in series and releases RA9.

The operator depresses digit 4 key which operates R0 and R4 which close a path to operate D100 and D104 which hold to HG ground. R0 and R4 release D which releases EV. The operator releases digit 4 key, releasing RO and R4 which cause D to operate. D causes RA11 and OD to operate in series.

u. Transfer of Guest Number from TPC to Memory

RA11, on operating releases RA10 and causes the start of a function to place the digital information in the memory. RA11 operates STM (FIG. 25) over a circuit extending from battery over the coil of STM (FIG. 25) S lead to FIG. 29, make of GSTR, make of RA11, make of RP, break of CAR, break of NFR to triangle master ground. STM operates and releases RP (FIG. 27) by opening the RP lead. RP releases NS (FIG. 29). RP causes the KP green lamp to go dark (FIG. 25). STM releases GST. GST was primarily held over a make of GST the TC lead, through FIGS. 34, 29, 28 to 27, make of RP break of TCL, make of GST, series breaks of RT, SPL, CD, CG, NFY, TBL, DAT, BH, DLT, DCG, DCD, DSPL, DRT to the TC1 lead to FIG. 28 and a break contact of STM, which as now operated opens the path to diamond ground on contacts of MPA break (FIG. 29). GST releases causing the KP GST lamp to go dark (FIG. 48). STM releases RA11 by opening the RP lead on FIG. 28.

v. Entry of TSD Position Number Into Memory

RP lead has the previously described diamond ground. RA11, on release, operates PN (FIG. 42). PN holds to diamond master ground (FIG. 42) PN closes ground (FIG. 41) to the ODO-OD7 and EVO-EV7 leads for position number identification. For this call it is assumed that the seized TSD is at position number 12. STM operates REGP (FIG. 24). A series break battery is on pin 2 of the coil of REGP (FIG. 24), which operates over REGP over the circuit which extends to the REGP lead to FIG. 28, make of STM, TC1 lead to FIG. 29, break of MPA relay to diamond ground.

w. Transfer of Function from TPC to TRT

REGP operates PG1 and PG1A (FIG. 49). PG1 closes ground to the REGP1 lead (FIG. 48) and also closes sync pulse (FIG. 46) via the transmit amplifier to the RS lead to the TRT-0. RS lead (FIG. 104) through FIG. 99, FIG. 100, FIG. 105 to the receiver amplifier (FIG. 106) and receiver which convert the sync pulse to a ground potential to be presented on lead LK1. The LK1 lead is extended through FIG. 105 to FIG. 100 to operate LK1 relay. The REGP1 lead (FIG. 81) is extended through make contacts of LK1 (FIG. 82) to operate REGP relay (FIG. 81). REGP holds to its own make contacts. REGP, on operating (FIG. 93 center), extends a momentary ground trough continuous transfer contacts, during bunching time, through RIGS. 88, 85, 86, to FIG. 83, make contacts of LK1 to the FR lead (FIG. 83). FR lead (FIG. 49) is extended through make contacts of PG1A to operate FR (FIG. 49). FR, on operating, releases PG1 and PG1A (FIG. 49) removing the ground from the REGP1 lead (FIG. 48) and also removes the sync pulse (FIG. 46) from the RS lead. Sync pulse removed from the RS lead (FIG. 104) causes the receiver amplifier and receiver (FIG. 106) to remove ground potential from the LK1 lead releasing LK1 relay (FIG. 100).

x. Storing of Guest Number in Memory

Referring again to FIGS. 6, 7, 8 and 9, REGP operated again extends the ground originating through the coil of TG1 to the RGP lead (FIG. 6). RPG releases FGC and operates LK1 which lead (FIG. 8) operates F10. F10 operates RPG (FIG. 8). RGP closes -V from the Zener diode (FIG. 9) to the RGP lead to operate TG1 (FIG. 6). TG1, when operated, extends ground to the FN lead (FIG. 54). FN lead in the TRT-0 (FIG. 81) operates the FN relay (FIG. 81). F10 (FIG. 8) remains operated to the voltage difference. TG1 operated causes the release of TGC preventing attempted seizures from other circuits. TGC on release applies master triangle ground to various parts of the circuit. TG1 operates the corresponding TC1 relay (FIG. 74). LK1 extends a ground to the PML link on the HP lead (FIG. 55) and also closes sync pulse R13 to the SPA lead (FIG. 54) to the TRT-0 which is extended through the TRT-0 to the position control circuit on the RS lead. RS1 lead (FIG. 46) is extended to the receiver amplifier (FIG. 48) where it becomes the circle 4 lead. In receiver R2, (FIG. 43) circle 4 lead with sync pulse 13 causes ML1 to operate. ML1 causes -48V to be presented to the PML link (FIG. 42, bottom left hand corner), and releases PN (FIG. 42).

The PML link, on operating, causes the MC relay (FIG. 35, bottom right hand corner) to operate, and connects ground to the C4 lead (FIG. 35) through the PML link to the memory (FIG. 55). Ground on the C4 lead causes C4 relay to operate in parallel with TN1 and TN2 relays (FIG. 55). TN1 and TN2, on operating, close the )D)-7 and EVO-7 leads to the PTO-PT7 and PUO-PU7 relays causing PT0, PT1, PU0 and PU2 relays to operate (FIG. 64) which hold to their own make contacts, thereby storing the position number. TN1 and TN2 operate FDC (FIG. 55) which releases TN1 and TN2. TN1 and TN2 extend the CH lead from ground on S2 (FIG. 58, bottom left hand corner) through the PML to the position control circuit which causes RA7 to operate (FIG. 43). FDC opens the HP lead to the PML (FIG. 55). FDC holds to its own 16 make contact. TN1 and TN2, on release, close a path from ground (FIG. 56) to operate HTL (FIG. 55). HTL causes H1 and H1A to operate (FIG. 52) from master triangle ground extended via break contacts of S1 (FIG. 52, bottom right hand corner). H1 and H1A hold through their own make contacts. H1 and H1A operate S1 (FIG. 58) and DC1, DC2 and DC3 (FIG. 50). DC1, DC2 and DC3 prepare paths to the category decoder (FIGS. 67 and 71). S1 closes the SLV lead (FIG. 54) from the TRT-0 via the transmit amplifier to the check register card (FIG. 70) and the category decoder (FIG. 67).

HTL closes -24V to the A1-3, 4-6, and 11-12 leads to the sense amps via the parity check cards (FIG. 69, A1-12) while ground is still being presented to the READ lead via break contacts 21, 22 of S2 (FIG. 51) which causes the information in the memory core stack to be transferred and stored in the sense amps which present the digital information to the D1 through D12 leads. The information on leads D1, D2, D3, D11 and D12 are then stored in the category decoder via the previously prepared paths of the DC1, DC2, and DC3 relays (FIG. 67).

S1 operates S2 (FIG. 51) which opens the READ lead. S2 further closes -24V to the A1-12 leads (FIG. 62) to the sense amps via the parity check cards (FIG. 69, A1-12). H1 closes ground to the parity check cards (FIG. 69, B1-12) thereby preparing the parity check cards for detection of any errors. S2 closes ground to the HS and ECF leads through make contacts 14, 15 of HTL (FIG. 58). Ground on the ECF lead to the category decoder (FIG. 67) operates ECF relay (FIG. 76) thereby presenting ground to the contact fan of the previously operated H0, H1, T1, T2, U0, U2, C0, C2, CL0 and CL1 relays. Ground on the HS lead (FIG. 58) to the read write card (FIG. 72) completes the necessary sequence to enable the parity check cards (FIG. 69) to detect any errors and also transfer the information back into the memory core stack.

The same ground operates H2 and H2A. H2 and H2A cause the release of S2 which releases H1 and H1A. H2A releases DC1, DC2, and DC3 (FIG. 50) which opens the D1, D2, D3, D11 and D12 leads to the category decoder. S2, on release, grounds the read lead causing the information stored in the second horizontal of the memory core stack to be transferred and stored in the sense amps (FIG. 69). S2 operates (FIG. 51) removing ground from the read lead and presenting ground to the HS lead which again completes the necessary sequence to enable the parity check cards to detect any errors and transfer the information back into the memory core stack.

S2 operates H3 and H3A which releases S2 which in turn releases H2 and H2A. S2, on release, grounds the read lead causing information, if any information has been previously entered, in the third horizontal to be transferred and stored in the sense amps. H2 and H2A, on release, operate S2 which removes the ground from the read lead and grounds the HS lead. Ground on the HS lead operates H4 and H4A which releases S2. H4 and H4A release H3 and H3A which operates S2 which causes ground to be extended through make contacts of PT0, PT1, PU0, PU2 (FIG. 58) to the D11 and D12 leads to the sense amps (FIG. 69).

S2 operates DW (FIG. 58) which now grounds the HS lead to cause the digital information in the sense amps to be stored in the memory core stack S2 also completes the necessary sequence to completely enable the parity check cards to detect any errors. Ground on the HS lead operates H5 and H5A (FIG. 52) which operates S3 (FIG. 51) and releases S2 (FIG. 51). H5 and H5A releases H4 and H4A which releases DW (FIG. 58). DW removes ground from the HS lead. S2, on release, places ground on the read lead which causes the information, if previously stored in the memory core stack, to be transferred and stored in the sense amps. Also, S2, on release, causes C7 (FIG. 57) to operate over a circuit which extends from battery over the coil of C7, through make contacts of HTL, break contacts of RC, CLT, series break contacts of C1 through C12, break contacts of S2 to FIG. 57 and out the 31 lead to FIG. 51, through make contacts of S3, make contacts of HTL to 21 break of S2, where ground is being presented by the contact fan of H1 through H5 on FIG. 58.

C7, on operating, closes ODO-OD7 (FIG. 64) to the D7 lead to the sense amp. At this time, the ODO-OD7 and EVO-EV7 are closed through to the position control circuit via the PML (FIG. 55). RA7 (FIG. 43), being previously operated, has presented ground to the ODO, OD1 leads. These leads now being extended to the sense amps via make contacts of C& are being presented to sense amp 7. C7 operates S2 over the circuit extending from battery over the coil of S2 to lead 32 to FIG. 57, make contacts 32, 31 of C7 to the 31 lead which has ground.

S2 operates C8 (FIG. 57) and E in series. This ground is extended to the EV lead through the PML (FIG. 55) to the position control where it becomes the ED lead (FIG. 42) which operates RA8. RA8 closes ground to the EV0 and EV2 leads which are presented to the sense amps via contacts of C8 (FIG. 64). S2 closes -24V to the sense amps via contacts of C8 (FIG. 64). S2 closes -24V to the sense amps (FIG. 62) via parity check cards. C8 releases C7 which is also occurring in the position control circuit (FIG. 43). The release of both C7 (FIG. 57) and RA7 (FIG. 43) releases E (FIG. 57). E released, operates 0 which operates C0 (FIG. 57) and RA9 (FIG. 42). RA9, being operated, causes ground to be presented to the OD1 and OD2 leads which are extended to the sense amps via contacts of C9 (FIG. 64). CO, when operated, releases C8 (FIG. 57) and RA9 releases RA8 (FIG. 42). The release of C8 and RA8 release 0. 0, on release, operates E which operates C10 and RA10. The digit four is stored in the sense amps.

C10 releases C9. RA10 releases RA9 which releases E. E, on release, operates 0 and DW in series (FIGS. 57 and 58). DW extends ground to the HS lead which causes the information stored in the sense amps to be transferred to the memory core stack and also completes the sequence necessary to completely enable the parity check cards to detect any errors. DW causes FNA to operate (FIG. 52). FNA closes a path to operate FN (FIG. 52). FN releases S2 (FIG. 51) and also releases 0 (FIG. 57) and C10. DW being series with O also releases. DW removes the ground to H5 and H5A (FIG. 52) which releases. FN closes sync pulse 15 to the SPA lead (FIG. 54) which is extended to the position control circuit via the TRT-0. The SPA lead becomes the RS lead in the TRT-0. H5 and H5A, on release, open the path holding S1 (FIG. 58) which, on release, closes ground (FIG. 52, bottom right hand corner) through the make contacts of FN to the FN lead. The FN lead becomes RPF (FIG. 54) to the TRT-0. The RPF lead (FIG. 81), through make contacts of FN (FIG. 81), through make contacts of RGP to knock down the RGP relay (FIG. 81).

y. Release of Memory and PML Switch

Referring to FIGS. 6, 7, 8 and 9, RGP on release, opens the RGP lead (FIG. 6) which releases F10 (FIG. 8) and RPG (FIG. 8). RGP also releases the TG1 (FIG. 6) which opens the ground holding FN (FIG. 81) and removes the sync pulses from the SPA lead (FIG. 54). RPG releases LK1 (FIG. 8) which on release, closes a path from battery (FIG. 9) to operate FGC (FIG. 6). FGC operates TGC which removes master triangle ground from the various parts of the circuit causing the release of the memory and the category decoder.

RS1 lead (FIG. 46) is extended to receiver amplifier (FIG. 48) which it becomes the circle 4 lead. In receiver R3, (FIG. 43) circle 4 lead with sync pulse 15 causes MPA to operate. MPA operates MP (FIG. 24) and releases STM (FIG. 25) and GSTR (FIG. 27). STM releases REGP relay (FIG. 24) which releases FR (FIG. 49). MP holds to its own make contacts and when the memory disconnects the sync pulse is removed and MPA will release. ML1 releases because of absence of sync pulse (FIG. 43), and opens the VP leads to the PML (FIG. 42) releasing the PML switch. RA10 (FIG. 42) releases due to the CH lead being opened through the PML switch. MC (FIG. 35, bottom RH corner) releases because the PML switch is released. ML1 releases HG (FIG. 29) which releases previously operated storage bins.

z. Automatic Buildup of Call Forward

GSTR, on release, closes a path to operate ACS (FIG. 27) which operates RLFA (FIG. 25). RLFA operates PG1 and PG1A (FIG. 49) which closes a ground to the ROF 1 lead (FIG. 25) to the TRT-0 and closes sync pulse (FIG. 46) via the transmit amplifier to the RS lead to the TRT-0. RS lead (FIG. 104), through FIGS. 99, 100, 105 to the receiver amplifier (FIG. 106) and receiver which convert the sync pulse to a ground potential to be presented on lead LK1. The LK1 is extended through FIG. 105 to FIG. 100 to operate LK1 relay. Ground on RPF lead (FIG. 83) through FIGS. 83, 86, 89, 94, 95 to FIG. 101 shunts down ROF relay (FIG. 101). ROF (FIG. 93) on release, extends a momentary ground through continuous transfer contacts, during bunching time, through FIGS. 88, 85, 86, to FIG. 83, make contacts of LK1 to the FR lead (FIG. 83). FR lead (FIG. 49) is extended through make contacts PG1A to operate FR (FIG. 49). FR, on operating, releases PG1 and PG1A (FIG. 49) removing the ground from ROF1 lead (FIG. 25). PG1 removes sync pulse on RS lead. LK1 releases in the TRT-0. ROF (FIG. 106) on releasing removes sync pulse 7 from the transmit amplifier to the RS lead which is extended to the RS lead (FIG. 46) in the position control. In receiver R1 (FIG. 25) circle 4 lead without sync pulse causes RLF to release. RLF (FIG. 27) releases ACS (FIG. 27) which releases RLFA (FIG. 25) which releases FR (FIG. 49).

aa. Seizure of Code Sending Converter (CSC)

ROF extends -48V to the CSC (code sending converter) on the CS1 lead (FIG. 86) and also to the Reg I on CS lead (FIG. 86), the circuit extending from over make contacts 21, 22 of HA (FIG. 88, center) break contacts of CSR, through make contacts of AC, break contacts of ROF, BY, C2 to the TO2 lead through break contacts of TXA (FIG. 85) to the CS1 lead to the code sending converter. -48V on CS1 lead (FIG. 110) operates CS1 which operates 1U (FIG. 110) 1U operates H. H1 causes the rotator chain to step (FIG. 108).

bb. Forwarding of Called Number from Memory to CSC

Referring again to FIGS. 6, 7, 8 and 9, the manner in which the code sending converter calls the memory to retrieve the called number for out pulsing is now set forth. FIG. 6 shows the ground from the coil of TG1 being extended by make contacts of CS1 and H relay, break of F, through the coil of MG to the MGS and MGA leads. MGS, through make contacts of TGC to the coil of F6 (FIG. 9) and MGA to the coil of F6 (FIG. 9). F6 operates TNS. TNS opens the -48V to FGC. FGC on release closes -35V from the Zener diode to the MGS and MGA leads causing TG1 to operate releasing TGC TG1 closes ground to the FN lead (FIG. 54) to the TRT-0 to operate FN (FIG. 81). TGC closes master triangle ground to various parts of the circuit. The release of TGC causes MG (FIG. 6) to operate. F6 remains operated to the voltage difference. TNS operates TC1, TC2, TC3, TC4, and TC5 (FIG. 50) which close the digital leads D1 through D10 to the code sending converter (FIG. 65). From break contacts of TX1 (FIG. 108) ground is extended over the CD lead to the memory (FIG. 65) where it becomes the CGD lead. CGD extends to FIG. 56 and again becomes the CD lead which causes TCD to operate (FIG. 55).

TCD operates H2 and H2A from master triangle ground (FIG. 52, bottom right hand corner). TNS has applied -24V (FIG. 61) to the sense amps via the parity check cards (FIG. 69). H2 and H2A operate S1 (FIG. 58). S1 grounds the read lead causing the information in the memory core stack to be transferred to the sense amps where the digital information is presented to the D1 through D10 leads to the code sending converter (FIG. 65).

The digital information is stored in the code sending converter relays A0-A7 through J0-J7 (FIG. 109). H2 and H2A operate S2 which removes the ground from the read lead (FIG. 51) and closes it to TC2 lead which is extended to the code sending converter (FIG. 65) where it becomes the T2 lead. T2 (FIG. 108) operates HS which closes ground to the HS lead (FIG. 108). HS lead (FIG. 65) is extended to the read write card to complete the sequence necessary for the parity check sends to be enabled to detect any errors (FIG. 73) and also causes the information stored in the sense amps to be transferred and stored in the memory core stack.

Ground on the HS lead also causes FNA to operate (FIG. 52) which also operates FN (FIG. 52). FN releases S2 (FIG. 51). S2 opens the TC2 lead which releases HS (FIG. 108). HS (FIG. 108) removes the ground from the HS lead which allows H2 and H2A to release (FIG. 52). H2 and H2A open the path holding S1 (FIG. 58) which, on release, closes ground (FIG. 52, bottom right hand corner) to the FN lead. The FN lead is extended to the code sending converter (FIG. 65) where it becomes the FIN lead. FIN lead (FIG. 108) operates the F relay (FIG. 108).

Referring to FIGS. 6, 7, 8 and 9, F (FIG. 6), on operating, opens the lead holding TG1, F6 and TNS. TG1, on release, opens the FN lead to the TRT-0 releasing FN relay in the TRT-0 (FIG. 81). TNS, on release, closes a path from battery (FIG. 9) to operate FGC (FIG. 6). FGC operates TGC which removes master triangle ground from various parts of the circuit, causing the release of the memory and the category decoder.

cc. Operator Release

The functions of the code sender converter, although happening now, will be explained in detail later in the sequence.

The FR relay (FIG. 27) having been released previously in the sequence, operates AST (FIG. 27). AST (FIG. 29) operates TMA (FIG. 25). TMA operates PG1 and PG1A (FIG. 49) which closes -48V through break of TM, make of AST, make TMA operates PG1 and PG1A (FIG. 49) which closes -48V through break of TM, make of AST, make TMA, make PG1 to the TM1 lead (FIG. 48) to the TRT-0. PG1 sens sync pulse on the RS lead (FIG. 46) to the TRT-0. RS lead (FIG. 104) through FIG. 99, 100, 105 to the receiver amplifier (FIG. 106) and receiver which converts the sync pulse to a ground potential to be presented to the LK1 lead.

The LK1 lead is extended through FIG. 105 to FIG. 100 to operate LK1 relay. The TM1 lead (FIG. 83) is extended through make contacts of LK1, through coil of TM relay, break of DT to rectangle 1 master ground operating TM relay which holds to its own contacts. TM, on operating, extends a momentary ground through FIGS. 88, 85, 86 to FIG. 83, make contacts of Lk1 to the FR lead (FIG. 83). FR lead (FIG. 49) is extended through make contacts of PG1A to operate FR (FIG. 49). FR, on operating, releases PG1 and PG1A (FIG. 49) removing the -48V from the TM1 lead. PG1, on release, removes sync pulse from the RS lead allowing LK1 to release in the TRT-0. The TM relay in the TRT-0 closes sync pulse 8 (FIG. 106) to the RS lead. RS lead (FIG. 46) in the position control circuit is extended to the receive amplifier to become circle 4 lead. FIG. 29, receiver R2, circle 4 lead with sync pulse 8, operates TM (FIG. 29).

Time start lamp (FIG. 32) now turns to green and red goes dark because of make and break contacts of TM relay (FIG. 32). TM operates ASM (FIG. 32). ASM holds through its own make contacts, and opens the path to AST (FIG. 27). AST opens the path holding TMA (FIG. 25), which releases FR (FIG. 49).

The operator may release at this time by depressing the POS RLS key. The operator depresses the POS REL key (FIG. 36) which operates PR and MB in parallel (FIG. 36). PR opens the RS lead (FIG. 46) which causes the TM relay which is being held by sync pulse over the RS lead to release (FIG. 29). The RS relay in the TRT-0 is released (FIG. 98). PR opens the FS lead (FIG. 32) which releases FS1A and FL1 (FIG. 32). FS1A releases FS1 (FIG. 32). FS relay in the TRT-0 is released (FIG. 100). PR release LG1 (FIG. 32) which removes master ground from the position control circuit which releases the ASW, BSW, and CSW switches and the position control circuit itself, making the position idle for another incoming call. Because the position control circuit is disconnected, SFA, SFB (FIG. 92) and OH (FIG. 99) will release in the TRT-0.

A call signal having been sent to the Reg-I simultaneously with the call signal to the code sending converter causes a Reg-I to attach to the code sending converter via the TRT-0 (FIG. 86).

dd. Transfer of Digit and Information from CSC to Reg I

Code sending converter, FIGS. 108, 109, 110, 111, -24V on St lead (FIG. 110) from the Reg I via the TRT-0 operates CST (code start) relay. H relay, having been previously operated caused SA1 (FIG. 109) to operate. The CST relay causes PG to operate (FIG. 111). CTS operates PL2 (FIG. 111) which operates PL1 (FIG. 111) and releases PG (FIG. 111). PL1 operates PS (FIG. 111) which holds to its own make contacts. PL1 connects the correct potential associated with the digital information to the ST and SR leads (FIG. 110). The fust digit is transferred to the Reg-I. PG, on release, releases PL2 (FIG. 111). PL2 reoperates PG (FIG. 111) and releases PL1 (FIG. 111). PL1 removes the potential from the SR and ST leads (FIG. 110). PL1 operates EV and SA2 in series (FIG. 109). SA2 releases SA1. PG closes a path to operate PL2 (FIG. 111). PL2 operates PL1 and releases PG.

PL1 connects the correct potential associated with the second digit to the SR and ST leads (FIG. 110) and also releases EV (FIG. 109). The remainder of the digital information will be transferred to the Reg-I in the manner previously described until all digits have been transferred.

On the last digit, EV operates in series with SA10 which releases SA9 (FIG. 109). PG is operated causing PL2 to operate. PL2 operates PL1 which releases PG. PL1 releases EV and the correct potential is connected to the SR and ST leads to cause the transfer of the tenth digit to the Reg-I. PG, on release, causes the release of PL2 which releases PL1. PL2, on release, operates PG. PL1 removes the potential from the SR and ST leads and causes OD and SA11 to operate in series. SA11 releases SA10 (FIG. 109).

PG, on operating, causes PL2 to operate. PL2 operates PL1 and releases PG. As there is no more digital information stored, PL1 operates ST (FIG. 111). ST applies +48 to the SR and ST leads as a start signal to the Reg-I. ST releases CST (FIG. 110) which releases PL2 (FIG. 111). PL2 releases ST and PL1 (FIG. 111). St, on release, closes +48V on the TX lead to the TRT-0 (FIG. 110). TX lead in the TRT-0 (FIG. 86) is extended through FIGS. 89, 90, to FIG. 95 to operate CSR which holds to its own contacts. CSR removes -48V from the CS1 lead to the code sending converter (FIG. 86). Removal of -48V from the CS lead in the code sending converter (FIG. 110) releases CS and 1U, which causes the release of H. H removes master ground from various parts of the circuit and the circuit is released. The Reg-I having received the called number presents resistance ground on the RC lead (FIG. 86) to operate C1 (FIG. 88). C1 operates C1A (FIG. 88) which removes -48V from Reg-I CS lead (FIG. 86). When the Reg I attaches to a sender-I the resistance ground on the RC lead is changed to a solid ground which causes C2 to operate (FIG. 88).

ee. Seizure of Switching Equipment for Call Forwarding

+48V on the TBY lead (FIG. 86) from the Reg-I is extended to operate TK (FIG. 89). TK holds to its own make contacts. C2 presents ground on the C lead forward (FIG. 105) to seize the group selector (not shown) and outgoing trunk. The Reg-I and Sender-I outpulse the called number. The outgoing trunk closes ground back on the S lead (FIG. 105) to operate C2A (FIG. 88) and hold C2 (FIG. 88). When the Reg-I and Sender-I have completed outpuling they disconnect by themselves. The Reg-I being released, causes C1 and C1A to release (FIG. 88). CIA removes ground from the C lead. C1, on release, closes the T & R leads from the subscriber to the outgoing trunk via a transmission bridge in the TRT-0 (FIG. 104). The transmission path for this call is through FIGS. 103, 104, and 105 T & R leads.

ff. Called Party Answer

The `B` or called party answers. The outgoing trunk presents ground back on the C lead (FIG. 105) which is extended through FIG. 100 to FIG. 94 to operate SUA (FIG. 94). SUA releases DA (FIG. 95) which releases DA1 (FIG. 95).

Referring to FIGS. 6, 7, 8 and 9, the ground extended from the coil of TG1 through break contacts of DA1 becomes the AT (answer time) lead (FIG. 6). AT lead operates F3 (FIG. 9) which operates AT (FIG. 9). AT releases FGC which closes -35V from the Zener diode (FIG. 9) to the AT lead to operate TG1 (FIG. 6). TG1, when operated, extends ground to operate FN relay in the TRT-0 (FIG. 81). F3 (FIG. 9) remains operated to the voltage difference. TG1 causes the release of TGC preventing attempted seizure from other circuits.

TGC, on release, applies master triangle ground to various parts of the circuit. TG1 operates the corresponding TC1 relay (FIG. 74). AT operates H4 and H4A (FIG. 52). H4 and H4A hold to their own make contacts. H4 and H4A operate S1 (FIG. 58). H4 closes -24V to the A2-6 and A7 leads (FIG. 71), and AT closes -24V to the A8-10 and A11-12 leads (FIG. 60) to the sense amps via the parity check cards (FIG. 69, A1-12) while ground is being presented to the READ lead which causes the information, if it had been previously stored, to be transferred from the memory core stack and stored in the sense amps. S1 operates S2 which removes the ground from the READ lead and closes it to the HM4 lead to FIG. 50 to operate CHS. CHS operates CC1, CC2, CC3, and DNC (FIG. 50). These relays operated connect the D2 through D7 leads to the clock and calendar (FIG. 66). The clock information (the answer time of the called party) is now presented to the sense amps where it is stored.

DNC, on operating, grounds the HS lead (FIG. 58) which causes the information stored in the sense amps to be transferred and stored in the memory core stack. Ground on the HS lead operates FNA which operates FN (FIG. 52). FN releases S2. S2 releases CHS which releases CC1, CC2, CC3, and DNC (FIG. 50). The release of these relays removes the D2 through D7 leads from the clock (FIG. 66). DNC removes ground from the HS lead which causes H4 and H4A to release. H4 and H4A release S1 which close the FN lead to ground.

Ground on the FN lead extended to the TRT-0 becomes the ATF lead (FIG. 54). ATF in the TRT-0 (FIG. 82) operates AT relay (FIG. 82) which holds to its own make contacts. AT, on operating, removes the ground from the AT lead (FIG. 6) which releases F3 and AT (FIG. 9) also releasing TG1 (FIG. 6) which opens the ground holding the FN relay in the TRT-0. AT, on release, closes -48V to operate FGC (FIG. 6). FGC operates TGC which removes master triangle ground from the various parts of the circuit releasing the memory and category decoder. Answer time is now stored in the memory.

gg. Flash Recall By calling Subscriber

Should the calling subscriber flash the switchhook of his telephone initiating a flash recall in the TRT-0 an idle TSD position would be seized. Answer time along with all other relevant information would be displayed to the operator. The called subscriber goes on hook, causing the outgoing trunk to remove ground from the C lead (FIG. 105) releasing the SUA relay (FIG. 94). The calling subscriber goes on hook and via the loop which is now open releases the A relay (FIG. 103). A releases H (FIG. 101) which releases HB (FIG. 101). HB releases C2A (FIG. 88) and HA (FIG. 96).

Referring again to FIGS. 6, 7, 8 and 9, the release of C2A causes the ground from the coil of TG1 to be extended to the F1 relay (FIG. 9). The sequence is identical to the previous answer time sequence with the exception that H5 and H5A are operated instead of H4 and H4A. Ground from the memory on the DTF lead (FIG. 82) causes DT to operate (FIG. 82) opening the ground between the coil of TG1 and F1 (FIGS. 6, 7, 8 and 9) causing the memory to release as previously described in the answer time function.

hh. Transfer of Digital Information in Memory To Tape Readout

DT holds to its own make contacts and releases AT (FIG. 82). Referring to FIGS. 6, 7, 8 and 9, the DT and TC operated (FIG. 6) ground is extended from the coil of TG1 to operate F12 (FIG. 7). F12 operates TC (FIG. 7). TC closes -48V to TP1, TP2 and TP3. TP1 operates releasing FGC which closes -35V to operate TG1. TG1 releases TGC. TGC, on release, applies master triangle ground to various parts of the circuit. TG1 operates the corresponding TC1 relay (FIG. 74) and closes ground to operate the FN relay in the TRT-0. T01 operates PA1, PA2, PA3, PA4, PA5, PA6 and PA7 (FIG. 50) which close the D1 through D12 leads to the tape readout (FIG. 66). TP1 operates TP (FIG. 55). TP operates H1 and H1A (FIG. 52). H1 and H1A operates S1 (FIG. 58). TP closes -24V (FIG. 62) to the sense amps via the parity check cards (FIG. 69, A1-12). S1 closes ground to the READ lead which causes the information in the memory core stack to be transferred and stored in the sense amps which present the digital information to the D1 through D12 leads which are now connected to the tape readout (FIG. 66). S2 operates removing the ground from the read lead and transferring it to the HM1 lead (FIG. 51). The tape readout having received the digital information places ground on the HS lead (FIG. 66) which is extended to the read write card (FIG. 72) which causes the information in the sense amps to be transferred and stored in the memory core stack and also completes the necessary sequence to enable the parity check card (FIG. 69) to detect any errors. The same ground operates H2 and H2A which release S2. S2 releases H1 and H1A and ground is again placed on the READ lead causing the information stored in the second horizontal to be transferred from the memory core stack and stored in the sense amps where the digital information again is presented to the D1 through D12 leads which are connected to the tape read out.

This procedure continues until all digital information has been transferred from the memory core stack to the tape read out. The tape readout knows this is a time and charge call because of ground extended to the tape readout from TC operated (FIG. 66, bottom right hand corner) and will cause a time and charge ticket to be printed prior to making the punched paper tape for billing purposes.

ii. Entry of Memory Number in TRTO

H5 and H5A and S2 operated causes N to operate releasing S2. S2 releases H5 and H5A. H5 and H5A, on release, causes S2 to operate. N operating ground the TRT-0 number strapping and memory number strapping points (FIG. 59) causing this information to be transferred to the tape readout. N also extends ground to the HM6 lead (FIG. 51). The tape readout, having received this last information, grounds the HS lead which operates FNA (FIG. 52). FNA operates FN. FN releases S2. The tape readout removes ground from the HS lead releasing N. N releases S1 which closes ground to the FN lead. Ground on the FN lead to the TRT-0 becomes the TPF lead (FIG. 54). TPF in the TRT-0 (FIG. 82) knocks DT down (FIG. 82).

jj. Release

Referring to FIGS. 6, 7, 8 and 9, DT, on release (FIG. 6) opens the ground from the coil of TG1 to the F12 relay causing the release of both. TG1, on release, causes the release of FN in the TRT-0. F12 releases TC and TP1. TP1, on release, closes -48V to operate FGC (FIG. 6). FGC operates TGC which removes master ground from various parts of the circuit allowing the memory and the category decoder to release.

DT relay in the TRT-0, on release, removed a substitute master ground (FIG. 82) from the TRT-0 which allowed the TRT-0 to release and make itself available to further incoming traffic.

ADDITIONAL FEATURES

Having completed the detailed description of the Hotel 1+ call, variations, using the preceeding description as a base, are now set forth.

a. Lack of Area Code or Seven Digit Called Address

A very common variation would be the lack of an area code or a seven digit called address. Had the hotel subscriber dialed or keyed only seven digits, the AR relay in the Reg TT (FIG. 11, Seg. 3) would not have been operated. Ground would be extended to the memory on the NA lead (FIG. 11, Seg. 3) causing NA1 and NA2 to operate in the memory (FIG. 54) reversing the EV0-EV7 and 0D0-0D7 leads (FIG. 63). The Reg. TT identification number (FIG. 15) would be shifted to the eighth stepping chain. NA1 closes ground (FIG. 56, center) to the TRD lead causing TRA (FIG. 57) to operate. TRA opens the path to the C1 stepping chain relay (FIG. 57) and closes a path to the C4 stepping chain relay (FIG. 57). Referring to FIG. 74, it will be seen that horizontal 2, vertical 1 through 11 may contain the called number whether it consists of seven or 10 digits and that vertical 12 will contain the Reg TT identification number. This variation would then proceed as set forth in the detailed description relating to the hotel +1 call.

b. Effect of Different Category Codes on System

Referring to FIG. 74 again, let us look at horizontal 1, verts 1 through 12. The manner of derivatives of the information and the effect the variations have on this information further reveals the capabilities of this system and the manner in which all types of calls are handled. Horizontal 1, verts. 1, 2 and 3 contain the category information which not only provides a source for establishing lamp indicators for the TSD position and for conditioning the memory to check various horizontals for errors, but further is very important in providing to the telephone industry in general a means for providing a toll settlement which is an inter-telephone company method of paying for the use of each others' services.

The detailed description used category hundreds 1, tens 3, and units 2. The units digit, derived from the core panel, as described in FIGS. 1 and 2 indicate the kind of subscriber which made the call. In the detailed description units digit 2, indicated that a hotel subscriber placed the call. The emphasis of effect is placed on the category decoder circuit FIGS. 75 through 80. If the subscriber had been a non-coin flat rate subscriber for 1+ call, the units digit 0 would replace the units digit 2 causing U4 and U7 relays (FIG. 76) to operate instead of U0 and U1. Ground extended to the contact fan (FIG. 80) would cause ground to be placed on the NC1+ lead (FIG. 80) which becomes the 1 lead (FIGS. 79 and 76). Ground on the 1 lead (FIG. 76) operates K1. K1 closes sync pulse R1 to the SLV lead (FIG. 79). Notice that ground was not extended to the RRO lead (FIG. 80) which in the previous detailed description caused the forward progress of the call to be halted also ground was not extended to the CG lead which caused the error to be detected in the memory indicating no guest number was present. Also, no ground on CTM lead did not cause TC relay (FIG. 93) in the TRT-0 to operate. The finish signal being returned to the Reg TT as previously described caused RF (FIG. 14) to be released and a -48V signal to be sent to the TRT-0 on the RF lead (FIG. 10). But because no ground was extended on the RR0 lead from the category decoder to the Reg TT, CL4 did not operate and close a ground to the TRT-0 on the R0 lead (FIG. 10). -48V on the RF lead in the TRT-0 (FIG. 84) causes RF to operate (FIG. 87) which releases relay ON (FIG. 87). Relay ON, on release, closes the A relay battery to the R lead (FIG. 103) which is the signal to the originating sender and register to start outpulsing. The call then proceeds as previously described. No operator participated in this call, and a time and charge ticket was not provided.

c. Automatic Time and Charge Without Operator Participation

With units digit 1 (Automatic time and charge without operator participation) substituted for units digit 0, the only difference in the category decoder (FIGS. 75-80) is that the CTM lead is grounded (FIG. 80). As previously described, ground will operate the TC relay in the TRT-0 (FIG. 93) to condition the tape head out to print a time and charge ticket, and the call is processed the same as in the case of the units digit 0.

Coin Calls (1+)

Coin indication is provided with units digit 3. Referring to the category decoder (FIGS. 75-80), FIG. 80 shows the ground on the contact fan being extended to the Cn1+ lead, CBM lead, RR0 lead and due to some changes that take place in the IBR, CL2 and CL4 operate (instead of CL0 and CL1) because the marking from the category are panel (FIG. 1) indicated that the call was from a coin telephone and as will be described in detail later, results in ground on the RG lead.

This direct ground on the CBM lead is extended to the TRT-0 (FIG. 102) where the lead designation changes to CBT, causing CB and CTM to operate in series (FIG. 99). The RR0 lead is extended back to the Reg TT, where it performs as set forth in the detailed description (i.e. operates CL4 FIG. 12) which closes ground to the R0 lead (FIG. 10) to the TRT-0 to operate R0F (FIG. 101). Ground on the RG lead is extended to the memory (FIG. 73) where it will cause the fourth horizontal to be checked for digital information during the MS function (previously described). Ground on the CN1+ lead changes to the 7 lead (FIGS. 79 and 76) causing K1, K2 and K3 to operate (FIG. 76) and close sync pulses R1, R2 and R3 to the SLV lead. The seizure of the position control and release of the originating sender and register is the same as previously described.

In the TRT-0 two additional relays CTM and CB (FIG. 99) have been operated. CTM, on operating, causes R to operate (FIG. 99). R closes -48V (FIG. 98, lower center) to the CS lead (FIG. 98) and to the CTM call timer circuit causing a call timer to be connected to the TRT-0. The call timer consists of a timing device actuated by 6 second pulses for timing purposes, and contains the coin control apparatus for collect, return, and rering. This is accomplished by in-band signaling. The timer being connected extends ground to the VH lead (FIG. 98) causing TH to operate (FIG. 98). TH releases CTM and R (FIG. 99).

Remembering that CL) and CL1 were changed to CL2 and CL4 in the category decoder, and referring to the contacts of the third category digit (FIG. 21), with C32 and C31 operated, ground has been placed on the 0D4 and 0D2 leads. As a result digit 6 is entered instead of 1 for the class charge digit, and the telephone industry is provided with a means for distinguishing between send paid coin and sent paid flat rate by merely looking at the class charge digit. Such information is useful as a means for establishing toll settlement.

1. Connection of TPC to TRT0

The position control circuit being connected through the ASW, BSW and CSW switches causes the TRT-0 to request an MS function as described in detail previously. Now, in stepping through the memory, the category decoder presents different sync pulses to the SLV lead. In the position control, the sync receivers will cause different relays to operate thereby causing different indicator lamps to be lit. As previously described, the SLV lead becomes the FS lead (FIG. 32) in the TPC which is closed to the receiver amplifier (FIG. 32) where it becomes the circle 5 lead. In receivers F7 and F8 (FIGS. 43, 44) R2 and R3 and circle 5 lead with sync pulses R1, R2, and R3 cause KC1, KC2 and KC3 to operate which closes a path to light the red sta coin lamp (FIG. 26, lower right hand corner). The call timer closed sync pulse 10 to the SL lead (FIG. 98) which becomes the RS lead to the TPC (FIG. 46) where it is closed through to operate CB1 (FIG. 48). CB1 closes a path to light TIME BACK (FIG. 36) lamp which indicates to the operator the direction of the coin control functions. Since ground was extended from the category decoder on lead RG, an error was detected during the memory scan on horizontal four and a ground is closed for the RNE lead (FIG. 70) to the check register card. The check register card then closes a sync pulse to the SLV lead which is extended to the TPC via the TRT-O where it becomes the FS lead. The FS lead in turn becomes the circle 5 lead and in receiver F2 (FIG. 31) circle 5 lead with sync pulse R16 causes Rt and RTA (FIG. 30) to operate, which in turn causes KP RT to light (FIG. 49). The rest of the lamp indications are the same as previously described.

2. Indications Provided to Operator

Referring to FIG. 5 the following chart identifies the lamps which have been lit and the circuits for effecting such operations.

Front Sleeve

Effect Position Relay Circuit Sync Pulse Control Pos. Lamp __________________________________________________________________________ K1, K2, Category 1, 2, 3 KC1, K3 Decoder KC2, KC3 Sta Coin (Red) AC1, Category 6, 7 AC1, AC2 HN PA (216) AC2 Decoder TCT0, Category 8, 9 TCT0, TCT1 (Station) TCT1 Decoder PAID (green) RNE Memory 16 RT, RTA KP RT Lead __________________________________________________________________________

Rear Sleeve

Effect Position Relay Circuit Sync Pulse Control Pos Lamp __________________________________________________________________________ Not Call Timer 10 CB1 TIME BACK Shown (Red) ROF TRT-0 7 RLF (Release) Forward (Red) TIME ST (red) CLD (white) ACS Flashing __________________________________________________________________________

3. Entry of Rate Code

The call now proceeds in the identical manner as previously described except that the operator enters a 3 digit rate code rather than a 4 digit guest number and secures the initial deposit.

4. Initial Period Notification

At the end of the initial period, the call timer closes the T & R leads (FIG. 104) and the TRC operates (FIG. 104). TRC closes ground to operate REC (FIG. 90) which causes a priority call signal to be sent to the TDS link marker. The TPC, on connection through the ASW, BSW and CSW switches cause the TRT-0 to request an MS function as previously described. In addition to the lamps previously described lamps NFY will also be lit. Sync pulse from the call timer on the RS (rear sleeve) lead will operate NY1 (FIG. 46). NY1 operates NFYC (FIG. 31) which lights NFY lamp (FIG. 22), NFYC operates LTG (FIG. 34), LTG operates LTGA (FIG. 33, upper right hand corner), LTGA operates CTM (FIG. 25). CTM operates PG1 and PG1A (FIG. 49) which at this time closes the 0D0-0D7 and EV0-EV7 lead to the call timer (FIG. 39 bottom) to receive the initial period (in minutes) which is also displayed to the operator. D61 and D62 in operating cause RLT to operate (FIG. 42). RLT operates BH (FIG. 35) which operates HG (FIG. 29). HG supplies ground to the storage relays allowing D61 and D62 (FIG. 39) to hold their own make contacts.

5. Operator Access to Call

The call timer, having sent the digital information, places a momentary ground on the FR lead (FIG. 49). FR operates which releases PG1 and PG1A (FIG. 49) PG1 and PG1A opens the 0D0-0D7 and EV0-EV7 leads (FIG. 39), BH releases CTM which releases FR. The operator accesses the call, notifies the subscriber of the end of the initial period, and releases.

6. Overtime

The call timer goes into overtime and causes OT to operate (FIG. 98). The subscriber, when finished talking, flashes his switchhook. `A` relay (FIG. 103) follows the pulses which activates the flash detector card (FIG. 91) causing FRE to operate. FRE closes ground to be extended to the memory on the DT lead as previously explained in the detailed description involving entry of the disconnect time into the memory. After disconnect time has been entered, a tape punch function is established as previously described. Now, having previously attached to a call timer TH relay is holding HA (FIG. 96) which keeps master grounds applied to various parts of the circuit. FRE not only established a disconnect time function, but also operated REC (FIG. 90).

7. Collection of Overtime Charges

REC has established a priority call signal to the TSD link marker for connection to an idle TPC as previously described in the notify function. The seizure of the idle TPC is affected in the same manner as in the description of the notify function with the exception that "charges due" lamp is lit instead of "notify" lamp by sync pulses from the call timer. The operator secures the money for the overtime period, collects the money, and releases the position which causes the timer and TRT-O to release. It is apparent now that a subscriber may flash his switchhook and activate the flash detector card which operates REC, signaling a priority call signal to the TSD link marker. When the TPC connects to the TRT-O causing a memory scan function, the answer time, if entered, will be displayed to the operator.

The storage of other units digits in the category decoder will result in the application of correspondingly different sync pulses to the SLV lead which terminates in receivers at the TPC to control lighting of correspondingly different indicator lamps.

d. Identification of Originating Place By Category Digits

The tens digit indicates the call originaion. In the previous detailed description the tens digit 3 identified the call as originating from the recorder office and caused the home numbering plan area lamp to light (from the category decoder). Tens digit 5 indicates that a tributary within the HNPA originated the call. Tens digit 6 indicates a tributary in one of two foreign number plan areas originated the call and causes the proper FNPA lamp to light (from the decoder).

Tens digit 7 indicates the other FNPA. The tens digit of the category may originate in the core panel of the recording office by grouping trunk sleeve wires, or may be sent from the trib along with the units digit and calling number via MF pulsing.

d. Identification of Type of Originating

The hundreds digit 1 was used in the detailed description and was derived from the Reg TT in combination with the class digit and the digital quantity received from the sender. Hundreds digit 1 indicates the subscriber dialed or keyed a station paid long distance DDD call. Hundreds digit 2 indicates the subscriber dialed a premium call such as a person-to-person, collect or special billing and requires the participation of the operator. Hundreds digit 0 indicates the subscriber dialed only the digit zero and requests operator assistance to complete the call. Hundreds digit 5 indicates an inward assistance (121) call from an intertoll trunk. Hundreds digit 6 indicates a WH (11XX) call from an intertoll trunk.

As previously stated, the combination of digital quantity and class received from the sender causes different hundreds digits to be derived as shown in FIG. 14. Point 1 shows rectangle ground 3 being applied by the ST relay, which operates from the start signal, through various combinations of CL relays and RA relays, and grounds the different CO-C7 leads which when closed to the IBR (FIG. 19) will cause ground to be extended to the memory as the first digit of the category. These category digits are presented to the category decoder on each seizure of the memory, and the different combinations of relays operated in the category decoder will cause correspondingly different sync pulses to be extended to the TPC via the TRT-O when a TPC is connected thereto.

Referring again to FIG. 74, horizontal 1, vertical 4 through 10 contain the calling number and vertical 11 and 12 the class type or class charge. The class type consists of two digits, tens and units. In the earlier description tens 2 and units 1 were used to identify the class type. Tens digit 2 indicates the call is station-to-station. Tens digit 3 indicates the calling subscriber has requested a particular person or a person-to-person call. The units digit indicates the charge, such as collect, third number, credit card, etc. The rest of FIG. 74 has either been explained or is self-explanatory.

e. Flash Recall

Assuming now that a calling subscriber for some reason has reached a wrong number and flash recalls the operator. The operator has accessed the call, and having been told by the subscriber that a wrong number was reached, orally requests the number which was dialed by the subscriber. To verify the number, the operator depresses the display called number key (FIG. 35) causing DCD (FIG. 34) to operate. DCD holds to its own make contact and operates DPC1 (FIG. 35). DPC1 operates Reg P (FIG. 24) by closing ground through break contacts of DRT (FIG. 28). The call now proceeds in the same manner as earlier described in the REG-P function with the exception that when the PML is closed between the memory, the TPC ground is extended on the C2 and C4 leads (FIG. 35) instead of only the C4 as in the earlier example. Ground on these leads operate C2 and C4 (FIG. 55) which close ground (FIG. 52) which, as previously described, will cause the information in the second horizontal of the memory to be transferred and stored in the sense amps. DPD closes ground (FIG. 51) to the 31 lead operating C1 (FIG. 57). The ODO-OD7, EVO-EV7, OD and EV leads are closed to the TPC via the PML, and the operation of the stepping chain, both in the TPC and memory are the same as earlier described with this exception that information is transferred from the memory to the TPC, C10 (FIG. 57) closes ground through make contacts of DPD, to operate DW which grounds to the HS lead. The finish signal and release are now the same as described.

It can be seen that had the operator depressed the display calling key, the calling number would have been transferred to the TPC storage bins. Also, the display special and display rate would create a similar function. The storage relays of the TPC have contact fans which convert the 2 out of 5 to 1 out of 10, and ground applied to the contact fan will cause Nixie tubes to light in the display panel of the position (FIG. 40, seg. 2). It is commonly understood that each Nixie tube has ten filaments which illuminate digits 1 through 0.

The operator verifies that the subscriber did dial the right number. The operator now depresses the time start key which is lit green (FIG. 32) because the call had been timing. The time start key depressed operates TMA (FIG. 25) via make contacts of the key and TM relay (FIG. 27). TMA now creates a function similar to the Reg P function to the TRT-O, as earlier described with the exception that ground is closed to the TMI lead (FIG. 48). The TMI lead in the TRT-O (FIG. 83) causes the TM relay to be shunted down. TM, on release, opens sync pulse 8 from the RS lead (FIG. 106) which releases TM relay in the TPC (FIG. 29) changing the green lamp to red which indicates timing has stopped and causing NTM to operate (FIG. 29).

The operator depresses the release forward key (which will release the forward connection) causing RLFA to operate (FIG. 25) via ground closed through make contacts of NTM (FIG. 29). The operation of RLFA creates a function similar to the Reg P function earlier described with the exception that Resistance -48V is closed to the ROF 1 lead (FIG. 25). The ROF (FIG. 101) operates ROA (FIG. 95). ROA opens the SU and S3 leads (FIG. 88) which is the ground on the sleeve lead toward the forward connection causing its release. ROF (FIG. 106) closes sync pulse to the RS lead which as previously described causes the release forward lamp to light red (FIG. 47) indicating to the operator that the forward connection is released. The operator depresses the start key which operates the ST relay (FIG. 24) which holds over its own contacts. ST operates RLFA (FIG. 25), which causes a function similar to that previously described when the forward progress of the call was started automatically.

At this time it is assumed for exemplary purposes that the subscriber requests the call to be person-to-person (rather than station as originally started) and requests a 3 minute notice. Request is also made for a time and charge ticket after call termination. The operator may perform any of the above listed requests in any sequence. The operator depresses the T & C key which operates the TC relay (FIG. 43). TC operates TCA (FIG. 24) which creates a function to the TRT-O similar to the Reg. P function, as previously described, with the exception that ground is extended to the TC1 lead (FIG. 48) which causes the TC relay in the TRT-O (FIG. 93) to operate and close a sync pulse, as described earlier, to the rear sleeve causing the T & C lamp to light (FIG. 44).

The operator depresses the Per. Paid Key (FIG. 30) causing PPD (FIG. 31) to operate which releases SPD (FIG. 30). SPD operates TCL (FIG. 34), and Person Paid Key releases KPD (FIG. 24). TCL releases TCH (FIG. 31), and operates CAR (FIG. 27) to diamond ground (FIG. 29, right center). CAR operates TCLR (FIG. 27) and RP (FIG. 27).

The operator removes her finger from the person paid key and KPD operates (FIG. 24) and releases CAR (FIG. 27). CAR, on release, operates RA11 (FIG. 42) which operates STM (FIG. 25). From the coil of STM to FIG. 29, make contacts of Reg-P on operating creates the same function as earlier described. When the PML is closed, ground is extended to the C3 lead (FIG. 35) instead of C4 as in the detailed description. C3 (FIG. 55) operates which in turn operates CLT (FIG. 55). CLT operates H1 and H1A (FIG. 52) which operates S1 (FIG. 58). S1 operates C11 (FIG. 57) which closes the ODO-OD7 leads to the sense amps. C11 operates S2 (FIG. 51) through make contacts 31, 32, (FIG. 57) and S2 operates C12 in the memory and TA12 in the TRT-O in series with E (FIG. 57).

The call now completes in the same manner as earlier described with the exception that the new class type digits in the category decoder close different sync pulses to the SLV which cause different TCT relays to operate in the TPC. In the present example Person Paid (FIG. 33) would be lit green. The operator depresses the KP NFY key operating NFY (FIG. 30). NFY operates CCTB (FIG. 32). CCTB closes sync pulse R2 (FIG. 46) to the RS lead via the transmit amplifier. CCTB closed -48V to the R lead (FIG. 24) from the 13J ballast lamp (FIG. 24). The -48V on the R lead in the TRT-O causes R relay to operate (FIG. 99) which connects a -48V call signal to the call timer circuit as previously described in the coin call. The timer being connected, and the sync pulse from the TPC being closed to the timer, causes the timer to connect but with the coin controls inhibited. The timer connects sync pulses R10 and R12 to the RS lead which cause CB1 and CF1 (FIG. 48) to operate. CF1 and CB1 light the TWD TIME BACK lamps (FIG. 36) as an indication to the operator that a timer has been connected but will have no coin control functions. NFY operates NFR (FIG. 27) which operates RA6 (FIG. 43).

The operator keys in digit 3, 4, or 5. The digit entered will operate the corresponding N3, N4 or N5 relay (FIG. 43). N3 operates CTM (FIG. 25) which now creates a function similar to the previously described REG-P function but instead of closing to the TRT-O, it is closed to the call timer. N3 closes sync pulses R1 to the timer (FIG. 44). The timer receives the sync pulse, and sends a function received signal which operates the FR relay (FIG. 49).

The operator now has changed the class type from STATION PAID (1+) to PERSON PAID (0+), connected a timer that will recall an operator at the end of 3 minutes, and conditioned the TRT-O so that on disconnect, a time and charge ticket will be printed. The call is now completed as previously described.

f. Call Originated by Operator

The TSD operator may originate a call using a TRT-O by depressing her ACS key to cause the TSD link marker to find an idle TRT-O and to connect the TRT-O to the requesting TPC. The operator enters the calling and called numbers and by operating the MK BACK key before depressing the start key will cause the calling number to be retrieved from the memory and stored in the code sending converter. The function will also cause the Reg I and Sender I to be called in for the out pulsing of information.

The operator depresses the start key a second time and the called information is retrieved from the memory and stored in the code sending converter. This function again causes a Reg I and Sender I to be attached for the out pulsing of information. Had the operator not depressed the MK BACK key originally, the called information would be sent first. In such event, the operator must depress the MARK BACK key, and then depress the START key to retrieve the calling information from the memory, and to effect storage thereof in the code sending converter. Completion of a WH call will be readily apparent therefrom.

ADDENDA

The queue control is in combination with the OGT and TSD link marker so that when all TSD positions are busy the call would be routed through the QSW crossbar switch (BB) to the queue circuit for storage until a TSD position becomes idle or makes a bid for an ONI call via the traffic regulator (DD).

The rate finder and decoder are optional equipment and are only accessed on coin calls.

The operator training system may be connected to any TSD position and simulates all other circuitry other than the clock which is used to tell time of day on the TSD position display panel. This is accomplished by pulling out the plug at the rear of the TSD board which connects to the TSD system and inserting the plug which connects to the TSD training system.

Toll Service Desk

A brief resume of the physical layout of the toll service desk keyboard and lamp display as shown in FIG. 5 at this time will simplify the understanding of the different call descriptions which follow.

The toll service desk as shown in FIG. 5 provides the operator with displays of the information set which is required to supervise all types of calls normally received at the operator's position, and provides the keys which are used by the operator in controlling the connection, as well as the ancillary equipment required for supervision and billing purposes.

The call control equipment consists of (1) a digital display; (2) lamps; (3) pushbotton keys; (4) alternate action pushbutton keys; (5) keys such as noted in 3 and 4 which also contain (internally) a lamp or lamps.

The abbreviations used for these different items are as follows:

Item Abbreviation __________________________________________________________________________ Digital Display (DD) Lamp (L) Push Key (K) Alternate Action Push Key (AK) Push Key With Lamp (KL) Alternate Action Push Key With Lamp (AKL) __________________________________________________________________________

identi- fication Item or Number Designation Description and/or Function 901 Digital Display used to display the following (DD) digital information as the (3 digits) equipment or operator may dictate: a. NPA code (if available) (area code). b. First three digits of a credit card number. c. The "hour" connect time (tens and units) of a flashing recall. d. "Charge" due on a coin call (when so equipped). 902 Digital display used to display the following (DD) digital information as the (3 digits) equipment or operator may dictate. a. Office code (either calling, called or third number). b. Second set of 3 digits of a credit card number. c. The minutes "connect" time (tens, units and tenth of minute) in a flashing recall. d. The initial time interval requested ("3, 4 or 5" minutes) on a notify call or the elapsed time (max. 10 minutes), subsequent to the initial period on a coin call. 903 Digital Display used to display the following (DD) digital information as the (4 digits) equipment or operator may dictate: a. Four digit station number (either calling, called or third number address). b. The last four digits of a credit card number. c. A three digit "Rate" or "Rate Code" when associated with a coin call. (The description "RATE" will also be lighted). 904 Digital Display A 24 hour clock indicating (DD) time in hours (tens & units), (5 digits) minutes (tens & units) respectively. 925 Calling Area These lamps, when lighted, Code Lamps indicate the area code of the (3) (L) calling subscriber. The left lamp indicates the home NPA. The center and right lamp will indicate the foreign NPA of offices served by the TSD, as required. 950-A Rate (AKL) Operation of the RATE key initiates a call signal to the rate operator. The lamp will flash at 120 IPM until answered by the rate operator; at which time, the lamp becomes steady. After receiving the information from the rate operator, the TSD operator will reoperate the RATE key to release the connection at which time the lamp will go dark. 950-B BV (AKL) Operation of the BV key initiates a call signal for a "Busy Verification" trunk. The lamp will flash at 120 IPM until a trunk is seized at which time the lamp will go steady. During the time the operator is connected to the "BV" trunk, her telephone circuit will be automatically "split" from the subscriber's loop circuit. Release of the "BV" trunk is accomplished by re-operation of the "BV" key at which time the lamp will go dark. 950-C TFR (KL) Transfer call to a "prime" position. Operation of the TFR key lights the TFR lamp. The call is directed to a "prime" position. The original operator can release from the loop and the "prime" operator will complete the call. 952 Non-Coin ("Kinds of Call" indication for calls from non-coin stations). 951-A STA (L) Indicates a station-to-station call. "1" + 7 or 10 digit called number. Operator must request and "key" calling number. 951-B PPCS (L) Indicates a person-to-person, collect, or special information call. "0" + 7 or 10 digit called number. Operator supervises the establishment of the connection as directed by the originating subscriber. Class-type information must be "keyed". 951-C DIAL 0 (L) Indicates the subscriber has dialed 0 only. The operator must "key" all information to automatically ticket the call. 951-D SPL Indicates the call has ori- SUB (L) ginated from a special subscriber (such as a mobile station). This lamp lights together with one of the previously described lamps and indicates that the calling number must be identified and "keyed". 924 Hotel "Kind of Call" lamps for traffic from PBX's which have automatic "time and charge" marking and require identification of the calling station. 924-A STA (L) Station-to-station call. Access Code +1 + 7 or 10 digit called number. 924-B PPCS (L) Person-to-person, collect or special information Access Code +0 + 7 or 10 digit called number. 924-C DIAL 0 (L) The subscriber has dialed 0 only. The operator must "key" all information to automatically ticket the call. 924-D KP Key pulse guest number. GST (KL) This is a lamp and key. A lighted KP Guest lamp indicated that the guest (ext., dept.) number is missing. Operation of the key makes the operator's keyset functional so that a four digit number (representing the room number, extension number or department number) can be "keyed". If the number given consists of less than four digits, the operator will prefix the number with sufficient zeros to satisfy the four digit requirement. 956 NFY (L) Lamp lights (red) to notify the operator at the end of the initial period on a coin call or at the end of the initial period (3, 4, or 5 minute) when requested on a non-coin call. 952 Coin ("Kind of Call" indication for calls from coin stations). 952-A STA (L) Indicates a station-to-station call. "1" + 7 or 10 digit called number. Operator must determine initial period and secure initial deposit. Operator also "keys" three digit rate. 952-B PPCS (L) Indicates a person-to-person, collect, or special information call. "0 + 7 or 10 digit called number. Operator supervises the establishment of the connection as directed by the originating subscriber. A call timer may be connected. 952-C DIAL 0 (L) Indicates the subscriber has dialed "0" only. The operator must "key" all information to automatically ticket the call. 952-D CHG Charges due at the end of 10 DUE (L) minute overtime period or at the end of conversation during an overtime period. The rate and elapsed time are displayed. Operator collects. 954 Auxiliary ("Kind of Call" indication keys and lamps equipped only on certain "Prime" positions. Positions so equipped have the ability to function as information or special service desks during periods of low traffic when the normal auxiliary service positions may not be manned). 953 SPL TOLL ("Kind of Call" indications for special toll traffic). 953-A WH (L) "We Have" or "TX" call. Because the called party at the distant office could not be reached on the original attempt, he (the called party) is returning the call by asking for "Operator M." The operator obtains the called number, the name and number of the (original) calling subscriber and operates the "MARK BACK" key. This enables the automatic equipment to set up a connection to the original calling subscriber. 953-B INW (L) Inward assitance given to a distant operator. The call is completed on a no-charge basis. If the call is collect to a coin station, a coin timer is connected and the disposal of coins is supervised. 953-C TS (L) Call has originated from a common battery Toll Station. Operator must "key" all information to automatically ticket call. 953-D EMG (L) Emergency--no use has been assigned to this lamp at the present time. 953-E SR (AKL) Two-way tie line to supervisor's turret. Operation of key causes lamp to flash at 120 IPM. Answer (by the supervisor) causes the lamp to become steady. An incoming signal (from the supervisor) is also indicated by a flashing SR lamp. The called operator answers by depressing the SR key, at which time the lamp becomes steady. The large red "request assistance" lamp (above the ticket compartment -- A1) will flash, become steady or dark in conjunction with the SR lamp. 953-F MAKE BUSY Make (position) busy. (AKL) The red MAKE BUSY lamp lights when the key is operated. The MAKE BUSY key should be operated before the position is released from a loop if it is desired to "busy" the position to incoming traffic. Re-operation of the MAKE BUSY key releases the key. MAKE BUSY lamp goes dark. 953-G (AKL) Position transfer left. Transfers the operator's head-set circuit to the position on the left and lights the red lamp in the key. 953-H (AKL) Position transfer right. Transfers the operator's head-set circuit to the position on the right and lights the red lamp in the key. The above keys allow the operator to dispose of calls left on loops on the position to the right or to the left when that position is vacated. Keys on the vacated position must be used to complete the calls. New calls will not appear at either position while the POS TR key is operated. The key is again operated to release the transfer condition. 905 CW (L) Call Waiting. This lamp indicates that one (or more) call, of any kind, is waiting to be answered by an operator. 957 ONI This is a key with a two color lamp indication. A lighted green lamp indicates that ONE ONI call is waiting to be processed. A lighted red and green lamp indicates that two (or more) ONI calls are waiting. Operation of the ONI ACC (Operator number identification-accept) key notifies the automatic equipment that the position will accept an ONI overlap call. The operator may be working a loop and find that she has time to accept an ONI call. If the call does come to her position, the loop she was working is automatically placed on HOLD. The HOLD lamp flashes. A different loop is seized by the ONI call. After the seven digit calling number is "Keyed" and the POS RLS key is operated, the operator is automatically reconnected to the original loop and the HOLD condition is removed. 906 Coin Control (Coin Control designation of nonilluminated keys.) 906-A COL (K) Collect. Collect key operation is a "backup" for collecting coins. Generally, it is not necessary because the coins are automatically collected when the calling party goes on-hook. 906-B RET (K) Return. Return key operation allows the operator to return a coin deposit. In the case of coin originated station-to-station traffic where the operator may leave the connection before the called party

answers, the coins are automatically returned if the calling party goes on-hook before the called party answers. 958 RING (Function designation of non-illuminated keys.) 958-A BACK (K) Ring back (to the calling party). Allows the operator to ring BACK to a PBX or distant operator or coin subscriber who has gone on-hook, after the call has come back to a position. Some tributaries are not arranged for ring-back and the calling coin station must, therefore, be instructed to flash on completion of an overtime call in order to recall an operator. 958-B FWD (K) Ring forward (to the called party). Permits re-ring to a "121" (Inward) operator: Also permits re-ring on a collect call to a coin station after the call signal has come back to a position. If the called office is not arranged for re-ring, the called coin station must be instructed to flash on completion of an overtime collect call in order to recall an operator. 925 T & C (KL) Time and charge marking key (illuminated). Operation of this key allows the operator to process a time and charge request from any non-coin station by "marking" the automatic equipment to prepare a time and charge ticket at the completion of the call. A lighted lamp indicates T & C marking has been received by the equipment, either by operation of the key or automatically in cases where all calls from certain subscribers always require time and charges. (PBX's, etc.) 909 RELEASE (Release control of forward and back connection). 909-A BACK (KL) Release back connection (to calling party). The BACK lamp and key are used on operator-originated calls only. A lighted red BACK lamp indicates that the connection to the calling party has not been established. After the calling number is keyed and the ST key operated, the light goes dark. Operation of the key, with a dark lamp, breaks the back build-up or connection and the lamp lights red. (Operation of this key on non-operator originated calls, disconnects the calling subscriber.) 909-B FWD (KL) Release forward connection (to called party). A lighted red FWD lamp indicates that that forward connection has not been established and that the ST key must be operated. If the lamp is dark, operation of the FWD key breaks the forward connection or prevents the forward build-up until the ST key is operated. The FWD lamp lights red. Operation of the FWD key does NOT erase the called number from the automatic equipment and the connection can be established or re-established by operating the ST key. 915 STATION (Station class and type assignment keys). 915-A PAID (KL) Station-to-Station, sent paid. 915-B COL (KL) Station-to-Station, sent collect. 915-C SPL Station-to-Station, charge CLG (KL) to other than the originating number, at the instruction of the original subscriber (credit card, 3rd number, etc.). 915-D SPL Station-to-Station, charge CLD (KL) to other than the terminating number, at the instruction of the terminating subscriber. (Credit card, 3rd number, etc.). 915-E AUTO Station-to-Station, auto- COL (KL) matic collect (Enterprise, etc.) 959 PERSON (Person class and type assignment keys). 959-A PAID (KL) Person-to-Person, sent paid. 959-B COL (KL) Person-to-person, sent collect. 959-C SPL Person-to-person, charge CLG (KL) to other than the originating number, at the instruction of the originating subscriber (credit card, 3rd number, etc.). 959-D SPL Person-to-person, charge CLD (KL) to other than the terminating number, at the instruction of the terminating subscriber. (Credit card, 3rd number, etc.). NOTE: The Station and Person "class-type" keys such as 915A, etc., each have a two-color (red and green) lamp cap. The red lamp indicates the equipment has been requested to accept the automatic class-type mark and the subsequent lighting of the green lamp is the equipment's acknowledgement to the operator, that the class-type requirement has been satisfied. 916 NO CHG (KL) No charge - This key has a two color (red and green) lamp cap. It is operated to provide a "no charge" indication (type digit) to the automatic equipment. A lighted red lamp indicates the equipment has been "called for" and the subsequent lighting of the green lamp indicates the equipment's acknowledgment of the "no charge" marking. Assuming the "NO CHG" key has been operated and is followed by the operation of the "POS RLS" key (D2), a billing record will not be made. If, however, the operation of the "NO CHG" key is followed by the operation of the "TIME ST" (D2) and "POS RLS" (D2) key, a billing record (with "no charge" type indication) will be made. 926-A POS Position release. RLS (KL) The POS RLS key releases a loop from the position so that a new call may be received. If the loop has been placed on HOLD, the POS RLS key releases the position circuit from that loop. The POS RLS key is effective only if all ticketing information has been provided (called number, calling number, class-type information, timing started and, on certain calls, rate or guest number), or if a ticket is not required (no charge or transfer). If the key is operated while some information is missing, the POS RLS lamp flashes at 120 I.P.M. while the key is depressed. 926-B CA Cancel call. CALL (K) The non-illuminated CA CALL key provides a means to force the release of a connection. Its operation releases the automatic equipment, the loop and the position. The originating subscriber receives busy tone from his line equipment. 926-C TIME Time Start. ST (KL) This key has a two section lamp cap which lights red until the equipment has been "conditioned" to start timing the call upon answer of the called party. The TIME ST key is operated whenever the "start of conversation" is the next step in the progress of the call. The lamp turns green to indicate that the "start timing" indication has been given to the automatic equipment. If the key is operated prematurely, it has no effect - the lamp remains red. If a call is processed on a "no charge" (NO CHG) basis, it is not necessary to operate the TIME ST key unless company policy requires a tape on such calls. Re-operation of the key, after the lamp is green, cancels the timing and the lamp turns red. 908 DISPLAY (Designation of the key grouping which allows the operator to activate the numerical display (A2; A3; A4) associated with each particular key. The keys are effective whenever the position is associated with a LOOP (D3) and the requested information is available from the equipment). 908-A RATE (K) This non-illuminated key causes the minute and rate digits to be displayed along with the words "minutes" and "rate" (effective only if a rate or rate code has been stored in the automatic equipment). The minute digit values are dependent on whether the call is in an initial period or in an overtime period. 908-B SPL Special (billing) number. NO (KL) This key lights when operated and displays the credit card number or a third number (effective only if a credit card or third number has been stored in the automatic equipment). 908-C CLG Calling Number. NO (KL) This key lights when operated and displays the seven or ten digit calling number. 908-D CLD Called Number. NO (KL) This key lights when operated and displays a seven or ten digit called number. 913 "LOOPS" Each TSD is equipped with four loops which may be compared to four (front and rear) cord pairs on a manual cord-type tollboard. Each loop is comprised of a combination of five keys and lamps: access key, hold key, called key, calling key, and time. Together, these items afford the operator a connection with the functional toll equipment. The operator receives a call via a loop and disposes of it over the same loop. The operator may be connected to only one loop at a time and no new calls will be directed to her position while she is connected to a loop. Calls are directed to the loop in a rotating "right to left" sequence thereby allowing the operator to anticipate the appearance of her next call and also equalizing the use and wear of the loop equipment.

Loop Control Keys--Each

913-B ACS (KL) Access Key. Operation of the ACS key allows the operator to connect her headset to the loop. She may be answering a call, initiating a call, or re-entering a loop previously placed on "hold" or signaling a "recall". On a new call, the ACS lamp flashes until the ACS key is operated. The lamp then becomes steady and informs the operator that she is connected to that loop. On operator initiated calls, operation of the ACS key causes the ACS lamp to flash until an outgoing trunk is seized. The lamp then becomes steady. Improper operation of the ACS key causes the ACS lamp to flash while the key is depressed. 913-F HOLD (KL) "Holds" the ticketing equipment connected to the loop for supervision by the operator even though the operator releases from that particular loop. The HOLD lamp lights when the key is operated. When the operator re-enters the loop, the "hold" condition is removed - the lamp goes dark. If the loop is to be placed on "hold" again, it is necessary to re-operate the HOLD key. If an ONI overlap call is accepted, the loop being worked is automatically placed on "hold". The HOLD lamp flashes at 30 I.P.M. The "hold" condition is automatically removed after the ONI overlap operation is completed. 913-J CLD (AKL) Called party supervision. Lighted: Unanswered ("on-hook"). Cark: Answered (off-hook). The key can be operated to split the calling party off the connection allowing the operator to talk to the called party. Re-operation of the key removes the split condition. 913-N CLG (AKL) Calling party supervision. Lighted: Unanswered ("on-hook"). Dark: Answered ("off-hook"). The key can be operated to split the called party off the connection allowing the operator to talk to the calling part. Re-operation of the key removes the split condition. 913-R TIME (L) This red lamp lights to indicate that a timer has been connected to the loop. The indication BACK indicates that the call originated from a coin box (The coin control signals are passed BACK). The indication FWD indicates that the call is terminating to a coin box (the coin control signals are passed "FORWARD" ). Coin Box Calls. Calls identified by coin "kind of call" lamp. A timer is automatically connected for an initial three minute period on station-to-station calls. On "sent paid" station calls from a coin box, the timer is automatically connected after the class-type PAID key is operated. A call timer can be connected on collect calls to a coin box by simultaneously operating the KP RATE and MARK FWD keys. Non-Coin Calls. On calls from non-coin subscribers , the timer may be connected for the notify functionby operating the KP NFY key and then "keying" a single digit for a 3, 4, or 5 minute period. When both the "BACK" and "FWD" lamps are lighted red, it indicates a "non-coin" subscriber has requested initial period notification. General. If a loop is placed on hold, the timer lamp remains lighted. When the notify or charges due signal is sent, the lamp flashes at 120 I.P.M. until the operator connects to the loop. 910 "KP () LAMPS & The KP () lamps are used KEYS" to indicate the necessary call information which has not been automatically secured and is, therefore, missing and must be provided to the equipment. Operation of a particular KP () key associates the KEYSET with the automatic equipment, in such a manner, that the operator may then "key-in" that particular information. Missing information may be "keyed" in any order. A dark lamp indicates the information is stored in the equipment. The operator may "erase" previously stored information by operating the associated key and "keying" new information. 910-D KP Key Pulse Called Number. CD (KL) A lighted KP CD lamp indicates that the called number is missing. Operation of the KP CD key associates the keyset so that the called number may be "keyed". Other KP lamps that may be lighted go dark until this operation is completed. The called number may consist of not less than three, nor more than ten, digits. After the address is "keyed", the operator must depress the ST key after which the KP CD lamp will go dark. 910-C KP Key pulse calling number. CG (KL) A lighted KP CG lamp indicates that the calling number is missing. Operation of the KP CG key associates the keyset so that the calling number may be "keyed". Other KP lamps that may be lighted go dark until this operation is completed. After calling number is "keyed", the KP CG lamp goes dark. The calling number must consist of seven digits. 910-B KP Key pulse the "notify" NFY (KL) period. The initial notify period on coin box calls is automatically set at three minutes. If the initial period should be four or five minutes, the operator must depress the KP NFY and then "key" a 4 or a 5. The key is also used to provide a 3, 4, or 5 minute "notify" period for non-coin subscribers who request such notice. 910-A KP Key pulse (one digit) TBL (KL) trouble code. If trouble is experienced on a connection (poor transmission, cut-off, etc.) the originating subscriber can recall an operator by "flashing". The operator can now insert the trouble code by operating the KP TBL key and keying the one digit code corresponding to the trouble encountered. The call may be re-established. NOTE: Any digits 1 thru 0 may be assigned, at the discretion of the operating company, to indicate a particular trouble condition. 910-G MARK BACK (KL) This key is used on "WH" or "TX" calls and on operator-originated calls to "mark" the automatic equipment to establish a connection "back" to the calling subscriber after the ST key has been operated. The green MARK BACK lamp will light when the key is operated. MARK BACK can also be operated simultaneously with the KP RATE key to connect a timer on a call from a coin box or to connect a timer to a tributary coin box which arrived without coin box "kind of call" marking. 910-H MARK FWD (KL) Operation of this key lights the green MARK FWD lamp to cancel a previous BARK BACK operation, thereby allowing the automatic equipment to establish a connection "forward" to the called party. MARK FWD can also be operated simultaneously with the KP RATE key to connect a timer on a collect call to a coin box. 910-F KP Key pulse special (billing) SPL (KL) number. A lighted KP SPL lamp indicates that the class-type SPL CLG or SPL CLD key has been previously operated and the special billing number has not, as yet, been keyed into the equipment. Operation of the KP SPL Key associates the keyset so that the ten digit billing number may be "keyed" into the equipment after which the KP SPL lamp will go dark. A previously "keyed" billing number may be "erased" and a new billing number "keyed" by subsequent operation of the KP SPL key. 910-E KP Key pulse (three digit) RATE (KL) rate. A lighted KP RATE lamp indicates that the three digit rate or rate code is missing on calls from a coin box. Operation of the KP RATE key associatesthe keyset so that the rate may be keyed. Other KP lamps that may be lighted go dark until this operation is completed. After the rate is keyed, the KP RATE lamp goes dark. 927 KP (L) Key pulse keyset supervision. This lamp will light in conjunction with a KP () key that was operated and lighted, indicating that the operator may start "keying" with her KEYSET. 911 KEYSET (K) The ten keys, "one thru zero" of the keyset are operational whenever the KP supervisory lamp is green, and allow the operator to "key" the necessary digital information into the automatic equipment. 912 ST (K) The "START" key must be operated to start the forward or back build-up on a "WH" or "DELAYED" type of call. The ST key is also operated after the operator "keys" a called number to indicate the "end of that number" so that equipment may be notified and start the call build-up. 914 ERROR (L) Gives an indication to the trainee that she has pressed a wrong key. 920 START (K) The trainee can start the program by pressing this key. 921 STOP (K) The program can be stopped by the trainee through depression of this key. 960 MAN (K) Key to be depressed by a new operator to gain familiarity with various keys. The depression of this key results in an effective disconnection of all the units except the register unit from the training board. __________________________________________________________________________

It is apparent from the foregoing description that in actual practice, a toll service desk (TSD) operator has to be trained to monitor many types and classes of calls, as for example, coin station-to-station, hotel-dial-0 person-to-person, delayed call person-to-person, etc. The extent of training will be further apparent from a detailed consideration

CORRELATION OF FIGS. 3 AND 5

In FIG. 3, the keys and lamps were generally identified as status key indicators, display key indicators, function key indicators, class-charge key indicators and kind of call indicators. The specific keys and lamps included in these different categories are listed below.

STATUS KEY INDICATORS

KP GST (A Hotel Key) CA CALL KP TBL RATE KP NFY SR KP CG MAKE BUSY KP CD ) POS. TR. KEYS ) POS RLS TIME ) ) CLG ) ) CLD ) LOOP KEYS ) HOLD ) ) ACS )

DISPLAY KEY INDICATORS

RATE SPL NO CLG NO CLD NO

FUNCTION KEY INDICATORS

ST ONI ACC T & C COL ) ) COIN CONTROL KEYS BACK ) RET ) ) RELEASE KEYS FWD ) BACK ) ) RING KEYS TIME ST FWD ) ONI ACC BV TFR

CLASS-CHARGE KEY INDICATORS

(PAID ) ( ) (COL ) ( ) CHARGE (SPL CLG ) STATION KEYS ( ) (Class) (SPL CLD ) ( ) (AUTO COL ) (PAID ) ( ) (COL ) CHARGE ( ) PERSON KEYS (SPL CLG ) (Class) ( ) (SPL CLD )

KIND OF CALL INDICATORS

216 ) ) 513 ) CALLING AREA CODE LAMPS ) 614 ) STA ) ) PPCS ) ) NON-COIN LAMPS DIAL O ) ) SPL SUB ) STA ) ) PPCS ) ) COIN LAMPS DIAL O ) ) CHG DUE ) STA ) ) PPCS ) HOTEL CALL LAMPS ) DIAL O ) WH ) ) INW ) ) SPL TOLL LAMPS TS ) ) EMG ) NFY ) NOTIFY LAMP

call sequences

with reference to the foregoing detailed description of a hotel 1+ call the description of the operators panel shown in FIG. 5 and the sequence description set forth hereinafter, the system's operation for other types of calls will become apparent to those of ordinary skill in the art.

NON-COIN PREMIUM CALL

1. Calling party dials 0-419-468-2420. Digits received and stored by Reg-O, which connects to SDR-0 and TNS.

2. SDR-0 establishes connection to TRT and Reg TT and marks for a "premium" call. (TNS releases.)

3. Reg TT receives and stores called number from SDR-0.

4. Reg TT calls buffer register and ALI and passes first category digit indicating 0+ call.

5. ALI gives buffer the calling number and second and third category digits indicating local, non-coin substation (ALI releases.)

6. Buffer register sends category code and calling number to memory. Reg TT sends called number to memory. (Buffer and Reg TT release.) (Reg-0 and SDR-0 release.)

7. TRT generates "new call" signal to TSD link marker.

8. TSD link marker identifies calling TRT-0 and gets queue "class" from memory category decoder.

9. TSD link marker establishes connection to TSD. TRT-0 scans MEM and passes signals to TSD to indicate kind and status of call. "ACS" lamp on. "CLD" lamp on. "Release FWD" lamp on. "Time ST" lamp on (red). "Non-coin PPCS" lamp on. Home area code lamp on (216). (TSD link marker releases.)

10. Operator obtains details of call and marks "class-charge." Operator presses "Person Paid" key. "Person Paid" lamp goes red, then green. MEM can signals "Class-charge" stored.

11. Operator starts forward connection. Operator presses "ST" key. "Release FWD" lamp goes dark.

12. CSC sends called number to Reg-I, which connects to SDR-I and TNS.

13. SDR-I establishes connection to OG trunk and outpulses required digits. (Reg-I, SDR-I, and TNS release.)

14. "Off-hook" signal sent from called office. "CLD" lamp goes dark.

15. Operator obtains called party and starts timing. Operator presses "Time ST" key. MEM scan signals "Answer Time" stored. "Time ST" lamp goes green.

16. Operator releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

17. On completion of call, TRT causes "disconnect time" to be stored in memory. TRO is connected and all billing information is sent to the tape punch.

COIN STATION CALL

1. Coin customer dials 1-419-468-2420. Coin "class" mark and digits received and stored by REG-O, which connects to SDR-O and TNS.

2. SDR-O establishes connection to TRT-O. REG-TT is seized.

3. REG-TT receives "Coin" mark and called number from SDR-O (REG-O, SDR-O and TNS release.)

4. REG-TT calls buffer register and ALI, and passes first category digit indicating 1+ call.

5. ALI gives buffer the calling number and second and third category digits indicating local, coin substation. (ALI releases.)

6. Buffer register sends memory the category code (three digits), calling number (seven digits), and class-type code (two digits), indicating coin, station-to-station, sent-paid call. REG-TT sends called number to memory (REG-TT and buffer release.) SDR-O causes initial coin to be refunded and releases.

7. Memory category decoder signals TRT-O to link to call timer and conditions TRT-O for rate finder scan.

8. TRT-O generates "new call" signal to TSD link marker.

9. TSD link marker identifies calling TRT-O and gets queue "class" from category decoder.

10. Rate finder receives calling office code and called area and office codes from memory and causes rate code to be stored in memory. (Rate finder releases.)

11. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "ACS" lamp on. "CLD" lamp on. "Station Paid" lamp on (green). "Release FWD" lamp on. "Time ST" lamp on (red). "Coin STA" lamp on. Home area code lamp on (216). Initial charge and period display. "Time" lamp on. Rate decoder receives rate code and one indication from MEM and sends signals to TSD for display of initial period charge and minutes. (TSD link marker and RDC release.)

12. Operator obtains coin deposit for initial period and starts forward connection. Operator presses "ST" key. "Rls FWD" lamp goes dark. REG-I is seized.

13. CSC sends called number to REG-I, which connects to SDR-I and TNS.

14. SDR-I establishes connection to OG trunk and outpulses required digits. (REG-I, SDR-I and TNS release.)

15. Operator listens for first ring-back-tone and releases the TSD, ASW, BSW and CSW switches. Operator presses time start key and "Pos Rls" key. All lamps go dark.

16. "Off-hook" signal from called office causes "answer time" to be stored in memory and starts timer.

17. Disconnect before the end of the initial period causes coins to be collected, and "disconnect time" to be stored in the memory. TRO is connected and all billing information is sent to the tape punch.

COIN RECALL - NOTIFY

1. Eighteen seconds before the end of the initial period, timer sends coin collect signal to the coin telephone.

2. Six seconds before the end of the initial period, timer causes TRT-O to generate "recall" signal to the TSD link marker.

3. TSD link marker identifies calling TRT-O and tests idle positions.

4. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate "notify" condition and kind and status of call. "ACS" lamp on. "Station Paid" lamp on (green). "Time ST" lamp on (green). "Coin Sta" lamp on. "NFY" lamp on. Home area code lamp on (216). Lapsed time. Call timer sends initial period time to TSD.

5. Operator notifies calling party of end of initial period, and releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

If the call is held on the position, the following operations take place:

a. 18 seconds before the end of the initial period, timer sends coin collect signal to the coin telephone. "Hold" lamp on.

b. 6 seconds before the end of the initial period, timer causes TRT-O to generate "recall" signal to TSD loop. "Time" lamp on (flashing).

c. Operator connects to calling loop. Operator presses "ACS" key. "Hold" lamp goes dark. "Time lamp on (steady).

d. TRT-O scans MEM and passes signals to TSD to indicate "notify" condition and kind and status of call. "ACS" lamp on. "Station Paid" lamp on (green). "Time ST" lamp on (green). "Coin STA" lamp on. "NFY" lamp on. Home area code lamp on (216). Lapsed time.

e. Operator notifies calling party of end of initial period, and releases TSD and ASW, BSW and CSW switches, or operator places call on "hold." Operator presses "hold" key and "Pos Rls" key. "Hold" lamp on, all others dark.

COIN RECALL - CHARGES DUE

1. Six seconds before the end of the overtime period (10 minutes), timer sends "recall - charges due" signal to TRT-O.

2. TRT-O generates "recall" signal to TSD link marker.

3. TSD link marker identifies calling TRT-O and tests idle positions.

4. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate "charges due" condition and kind and status of call. "ACS" lamp on. "Station paid" lamp on (green). "Time ST" lamp on (green). "CHG DUE" lamp on. "Coin Sta" lamp on. Home area code lamp on (216). "Time" lamp on.

5. Timer sends lapsed time to TSD, which links to memory and rate decoder and charge computer. Total charges and lapsed time display. From lapsed time and overtime rate, RDC sends signals to TSD for display of total charges.

6. Operator obtains deposit of overtime charges and causes "coin collect" signal to be sent to coin telephone. Operator presses "coin col" key.

7. Operator releases TSD and ASW, BSW, and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

8. At the end of the call, calling party flashes the switch-hook. TRT causes "disconnect time" to be stored in MEM and stops timer. TRO is connected and all billing information is sent to the tape punch.

9. TRT-O generates "recall" signal to TSD link marker.

10. TSD link marker identifies calling TRT-O and tests idle positions.

11. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate "charges due" condition and kind and status of call. "ACS" lamp on. "Station Paid" lamp on (green). "Time ST" lamp on (red). "CHG DUE" lamp on. "Coin STA" lamp on. Home area code lamp on (216). "Time" lamp on.

12. Timer and computer send signals to TSD for display of lapsed time and total charges. Total charges and lapsed time display.

13. Operator obtains deposit of overtime charges and causes "coin collect" signal to be sent to coin telephone. Operator presses "coin col" key.

14. Operator releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

15. The calling connection releases when the calling station goes "on hook," or is force-released after a time-out period in the TRT.

NOTE: If the call is held on the position, the "Time" lamp will flash at the end of an overtime period, and when the calling party flashes.

COIN CALL WITHOUT RATE FINDER AND DECODER

1. Coin customer dials 1-419-2420. Coin "class" mark and digits received and stored by REG-O, which connects to SDR-O and TNS.

2. SDR-O establishes connection to TRT-O. REG-TT is seized. (TNS releases.)

3. REG-TT receives "coin" mark and called number from SDR-O.

4. REG-TT calls buffer register and ALI, and passes category digit 1, indicating 1+ call.

5. ALI gives buffer the calling number and category digits 2 and 3, indicating local, coin substation. (ALI releases.)

6. Buffer sends MEM the category code, calling number, and class-type code, indicating coin, station-to-station, sent-paid call. REG-TT sends called number to MEM. (Buffer and REG-TT release.) SCR-O causes initial coin to be refunded and REG-O and SDR-O release.

7. Memory category decoder signals TRT-O to link to call timer.

8. TRT-O generates "new call" signal to TSD link marker.

9. TSD link marker identifies calling TRT-O and gets queue "class" from category decoder.

10. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "ACS" lamp on. "KP Rate" lamp on. "CLD" lamp on. "Station Paid" lamp on (green). "Release FWD" lamp on. "Time ST" lamp on (red). "Coin STA" lamp on. Home area code lamp on (216). "Time" lamp on. (TSD link marker releases.)

11. Operator displays calling and called numbers and determines rate. Operator presses "Display CLG NO." (CLG NO.) key. "Display CLD NO." (CLD NO.) lamp on. Nixie displays on.

12. Operator keys in three-digit rate for overtime charge per minute (less tax). Operator presses "KP RATE" key. "KP" lamp on (red), then (green). Operator keys "065." "KP RATE" and "KP" lamps go dark.

13. Operator obtains coin deposit for initial period and starts forward connection. Operator presses "ST" key. "Release FWD" lamp goes dark. REG-I is seized.

14. CSC sends called number to REG-I, which connects to SDR-I and TNS.

15. SDR-I establishes connection to inter-toll trunk and outpulses required digits. (REG-I, SDR-I and TNS release.)

16. Operator listens for first ring-back-tone and releases the TSD and ASW, BSW and CSW switches. Operator presses time start key (time start lamp turns green) and "Pos Rls" key. All lamps go dark.

17. "Off-hook" signal from called office causes "answer time" to be stored in memory and starts timer.

18. Disconnect before the end of the initial period causes coins to be collected and "disconnect time" to be stored in the memory. TRO is connected and all billing information is sent to the tape punch.

COIN RECALL - CHARGES DUE WITHOUT RATE FINDER AND DECODER

1. Six seconds before the end of the overtime period (10 minutes), timer sends "recall-charges due" signal to TRT-O.

2. TRT-O generates "recall" signal to TSD link marker.

3. TSD link marker identifies calling TRT-O and tests idle positions.

4. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate "charges due" condition and kind and status of call. "ACS" lamp on. "Station paid" lamp on (green). "Time ST" lamp on (green). "CHG DUE" lamp on. "Coin STA" lamp on. Home area code lamp on (216). "Time" lamp on.

5. Timer sends signals to TSD for display of lapsed time. Lapsed time and rate display. MEM sends signals to TSD for display of overtime rate previously keyed in by an operator.

6. Operator computes charges, adds tax, obtains deposit of coins, and causes "coin collect" signal to be sent to coin telephone. Operator presses "coin col" key.

7. Operator releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

8. At the end of the call, calling party flashes the switch-hook. TRT-O causes "disconnect time" to be stored in MEM, and stops timer. TRO is connected and all billing information is sent to the tape punch.

9. TRT generates "recall" signal to TSD link marker.

10. TSD link marker identifies calling TRT-O and tests idle positions.

11. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate "charges due" condition and kind and status of call. "ACS" lamp on. "Station Paid" lamp on (green). "Time ST" lamp on (red). "CHG DUE" lamp on. "Coin STA" lamp on. Home area code lamp on (216). "Time" lamp on.

12. Timer and MEM sends signals to TSD for display of lapsed time and overtime rate. Lapsed time and rate display.

13. Operator computes charges, adds tax, obtains deposit of coins, and causes "coin collect" signal to be sent to coin telephone. Operator presses "coin col" key.

14. Operator releases TSD and ASW, BSW and CSW switches.

15. The calling connection releases when the calling station goes "on-hook," or is force-released after a time-out period in TRT-O.

NOTE: If the call is held on the position, the "Time" lamp will flash at the end of an overtime period and when the calling party flashes.

WH CALL

1. Operator in distant office dials "11XX" into recording office. Digits are received and stored by REG-I, which connects to SDR-I and TNS.

2. SDR-I establishes connection to TRT-O and marks for a "premium" call. (TNS releases.)

3. REG-TT receives and stores the digits "11XX" from SDR-I.

4. REG-TT calls buffer register and ALI, and passes first category digit indicating "WH" call.

5. ALI identifies trunk, adds second and third category digits, and passes category code to biffer and MEM. (ALI, buffer register, REG-TT, REG-I, SDR-I release.)

6. TRT-O generates "new call" signal to TSD link marker.

7. TSD link marker identifies calling TRT-O and gets queue "class" from memory category decoder.

8. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "Release FWD" lamp on. "Time ST" lamp on (red). (TSD link marker releases.)

9. Operator obtains details of call and marks "class charge." Operator presses "person paid" key. MEM scan signals "class-charge" stored. "Person paid" lamp goes red, then green.

10. Operator keys in calling number (operator presses "KP CG" key, "KP CD" lamp goes dark; "KP" lamp goes red, then green; operator keys calling number) and marks for sending of calling number (operator presses "Mark Back" key; "Mark Back"

lamp on), MEM scan signals "calling number" stored ("KP CG," "KP" lamps go dark; "KP CD" lamp on).

11. Operator keys in called number (operator presses "KP CD" key; "KP" lamp goes red, then green; operator keys called number) and starts forward connection (operator presses "ST" key; "RLS FWD," "KP CD," "KP" lamps go dark), MEM scan signals "called number" stored. REG-I is seized.

12. CSC sends calling number to REG-I which connects to SDR-I.

13. SDR-I establishes connection to STT and calling line. STT rigns calling station. (REG-I, SDR-I release.)

14. Calling station answers.

15. Operator obtains calling party and starts timing (operator presses "Time ST" key), MEM scan signals "answer time" stored ("Time ST" lamp goes green).

16. Operator releases TSD and ASW, BSW, and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

17. On completion of call, TRT causes "Disconnect time" to be stored in memory. TRO is connected and all billing information is sent to the tape punch.

INW CALL - COLLECT TO A COIN STATION

1. Operator in distant office dials 121 into recording office. Digits are received and stored by REG-I which connects to SDR-I and TNS.

2. SDR-I establishes connection to TRT and marks for a "premium" call. (TNS releases.)

3. REG-TT receives and stores the digits 121 from SDR-I.

4. REG -TT calls buffer register and ALI and passes first category digit indicating "INW" call.

5. ALI identifies trunk, adds second and third category digits, and passes category code to buffer and MEM. (ALI, buffer register, REG-TT, REG-I and SDR-I release.)

6. TRT-O generates "new call" signal to TSD link marker.

7. TSD link marker identifies calling TRT-O and gets queue "class" from memory category decoder.

8. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "KP CG" lamp on, "ACS" lamp on. "INW" lamp on. "CLD" lamp on. "Release FWD" lamp on. "Time ST" lamp on (red). (TSD link marker releases.)

9. Operator obtains details of the call and connects timer for coin control of called station. Operator pressed "KP RATE" and "MARK FWD" keys; "KP RATE" lamp and "Time" lamp on.

10. Operator marks "no charge" "class charge." Operator presses "No CHG" key. "NO CHG" lamp goes red, then green. "KP RATE" lamp goes dark.

11. Operator keys in called number (Operator presses "KP CD" key; "KP CG" and "KP RATE" lamps go dark; "KP" lamp goes red, then green; operator keys called number) and starts forward connection (operator presses "ST" key), MEM scan signals "called number" stored. REG-I is seized ("RLS FWD", "KP CD", "KP" lamps go dark; "KP CG" and "KP RATE" lamps on.)

12. CSC sends called number to REG-I which connects to SDR-I.

13. SDR-I establishes connection through STT to called line. STT rings called station. (REG-I and SDR-I release.)

14. Called station answers. "CLD" lamp goes dark.

15. The distant operator requests the charges for the call and the TSD operator supervises the deposit and collection of coins.

16. When the call is established, the TSD operator releases the position and ASW, BSW and CSW switches.

17. The distant operator may recall the TSD operator for further coin control functions by ringing forward. The TSD operator may recall the distant operator by ringing back ("ring back" key.)

18. On call completion, the TSD operator is connected to the call and releases the position and link.

OPERATOR ORIGINATED CALL

1. Operator calls for outgoing trunk. OGT marker identifies call and seizes TRT-O. Operator presses "ACS" key. "ACS" lamp on flashing, then steady.

2. TRT-O generates an "OGT call" signal to TSD link marker.

3 TSD link marker identifies calling TRT-O.

4. TSD link marker establishes connection to TSD marked for OGT call. MEM is erased and TRT-O passes signals to TSD to indicate status of call. "KP CD" lamp on. "KP CG" lamp on. Non-Coin Dial 0 lamp on. "CLD" lamp on. "CLG" lamp on. "RLS FWD" lamp on. "RLS Back" lamp on. "Time ST" lamp on (red). (Markers release.)

5. Operator keys in calling number. Operator presses "KP CG" key. "KP CD" lamp goes dark. "KP" lamp on red, then green. Operator keys calling number. MEM scan signals "calling number" stored. "KP CG," "KP" lamps go dark. "KP CD" lamp on.

6. Operator keys in called number. Operator presses "KP CD" key. "KP" lamp on red, then green. Operator keys called number, and starts forward connection. Operator presses "ST" key. MEM scans signals "called number" stored. "KP," "KP CD," RLs Fwd lamps go dark.

7. CSC sends called number to REG-I which connects to SDR-I and TNS.

8. SDR-I establishes connection from front TRT-O inlet to OG trunk and outpulses required digits. (REG-I, SDR-I and TNS release.)

9. Operator marks class-charge. Operator presses "person paid" key. MEM scan signals "class-charge" stored. Operator presses "PER PAID" lamp on red, then green.

10. Operator starts backward connection. Operator presses "Mark Back" key. "Mark Back" lamp on (green). Operator presses "ST" key. "Rls Back" lamp goes dark. REG-I is seized.

11. CSC sends calling number to REG-I which connects to SDR-I.

12. SDR-I establishes connection from rear TRT-O inlet to STT and calling line. STT rings calling station. (REG-I, SDR-I release.)

13. Calling and called parties answer.

14. When the conversation starts, operator starts timing. Operator presses "Time ST" key. TRT-O signals "answer time" started. "Time ST" lamp goes green.

15. Operator releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

16. On completion of call, TRT-O causes "disconnect time" to be stored in MEM. TRO is connected and all billing information is sent to the tape punch.

NOTE: If the calling party flash recalls, the call will appear on a TSD position as a "non-coin dial 0" kind of call.

QUEUING - ONI OVERLAP

1. Calling party dials 1-419-468-2420. Digits received and stored by REG-O which connects to SDR-O and TNS.

2. SDR-O establishes connection to TRT-O and marks for a "station" call to a trunk. (TNS releases.)

3. REG-TT receives and stores called number from SDR-O.

4. REG-TT calls buffer register and ALI and passes first category digit indicating 1+ call.

5. ALI detects absence of identity jumper and gives buffer second and third category digits indicating local, non-coin substation.

6. Buffer gives memory the category code and the class-charge code indicating non-coin, station-to-station, send-paid call. MEM detects absence of calling number and signals for call to operator. REG-TT gives called number to MEM. (Buffer, REG-TT, REG-O and SDR-O release.)

7. TRT-O generates "new call" signal to TSD link marker.

8. TSD link marker identifies calling TRT-O and gets queue "class" from memory category decoder.

9. TSD link marker tests "all positions busy," calls queue control and passes TRT-O identity and queue class.

10. Queue control (QC) connects TRT-O to queue. "CW" and "ONI ACC" lamps on. Calling party gets ring back tone from TRT-O. (Marker and QC release.)

11. An operator bids to accept the waiting ONI call on an "overlap" basis. Operator presses "ONI ACC" key. "Hold" lamp on flashing. "ACS" lamp goes dark. All other position call lamps go dark. Traffic regulator (TR) scans the queue for on ONI call and signals TRT-O to call TSD link.

12. TRT-O generates "out of queue" call to TSD link marker. Marker identifies TRT-O and gets "class" from queue.

13. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "KP CG" lamp on. "ACS" lamp on. "Station paid" lamp on. "CLD" lamp on. "Release FWD" lamp on. "Time ST" lamp on (red). "Non-coin STA" lamp on. Home are code lamp on (216). "CW" and "ONI" lamps go dark. (Unless another call is waiting) (MRK and queue release.)

14. Operator keys calling number. Operator presses "KP CG" key. "KP" lamp goes red, then green. Operator keys calling number. "KP CG," "KP" and "RLS FWD" lamps go dark. "TIME ST" lamp goes green. Releases position and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. Loop and position lamps go dark. "ACS" lamp on. "HOLD " lamp on goes dark. All other lamps relating to the "over-lapped" call go on. REG-I is seized.

15. CSC sends called number to REG-I which connects to SDR-I and TNS. (CSC releases.)

16. SDR-I establishes connection to OG trunk and outpulses required digits. (FEG-I, SDR-I and TNS release.)

17. "Off-hook" signal from called office causes TRT to store "answer time" in memory.

18. On completion of call, TRT causes "disconnect time" to be stored in memory. TRO is connected and all billing information is sent to the tape punch.

NOTE: The forward connection is started automatically during the keying of the calling number.

MANUAL MOBILE CALL

1. Mobile station goes off-hook. Seizes mobile trunk. FIG. 1 1C TKS terms.)

2. Trunk connects to REG-I and marks for "common battery" operation. REG-I connects to SDR-I and TNS.

3. SDR-I establishes connection to TRT and REG-TT, and marks for a 0- call. (TNS releases.)

4. REG-TT calls buffer register and ALI and passes first category digit indicating 0- call.

5. ALI identifies trunk and gives buffer second and third category digits, indicating home NPA, mobile substation. (ALI releases.)

6. Buffer sends category code to MEM. (Buffer, REG-TT, REG-I and SDR-I release.)

7. TRT-O generates "new call" signal to TSD link marker.

8. TSD link marker identifies calling TRT-O and gets queue "class" from memory category decoder.

9. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "KP CD" lamp on. "KP CG" lamp on. "ACS " lamp on. "CLD " lamp on. "Release FWD" lamp on. "Time ST" lamp on (red). "SPL SUB" lamp on. "NON-COIN Dial 0" lamp on. Home area code lamp on (216). (TSD link marker releases.)

10. Operator obtains details of the call and marks "class-charge." Operator presses "STA PAID" key. MEM scan signals "class-charge" stored. "STA PAID" lamp goes red, then green.

11. Operator keys calling number. Operator presses "KP CG" key. "KP CD" lamp goes dark. "KP" lamp goes red, then green. Operator keys calling number. MEM scan signals "calling number" stored. "KP" lamp goes dark. "KP CD" lamp on.

12. Operator keys called number. Operator presses "KP CD" key. "KP" lamp goes red, then green. Operator keys called number. Starts forward connection. Operator presses "ST" key. MEM scan signals "called number" stored. "RLS FWD," "KP CD," "KP" lamps go dark. REG-I is seized.

13. CSC sends called number to REG-I which connects to SDR-I and TNS.

14. SDR-I establishes connection to OG trunk and outpulses required digits. (REG-I, SDR-I and TNS release.)

15. Operator marks TRT to start timing on called station "off-hook." Operator presses "Time ST" key. "Time ST" lamp goes green.

16. Operator waits for connection to be established, then releases the position and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

17. "Off-hook" signal from called office causes "answer time" to be stored in MEM.

18. 1C trunk sends disconnect signal ("on hook") to TRT-O, when: (a) auto. mobile: "on hook" signal received, or carrier absent 6.5 seconds. (b) Manual mobile: absence of carrier and voice for 8 seconds. "Disconnect time" is stored in MEM.

19. TRO is connected and all billing information is sent to the tape punch.

NON-IDENTITY TRIBUTARY CALL

1. Calling party in tributary office dials "station" access code, plus 232-2305. Call is connected to 1C trunk. REG-I is seized and gets a mark indicating a "station" call. (From access code or from trunk (dual-function, or segregated group)).

2. REG-I receives and stores called number and connects to SDR-I.

3. SDR-I establishes connection to TRT-O and REG-TT and makes a "station" local call.

4. REG-TT receives called number from SDR-I and "non-identity" tributary mark from trunk.

5. REG-TT calls buffer register and ALI and passes first category digit indicating 1+ call.

6. ALI gives buffer second and third category digits indicating home NPA, non-coin substation. (ALI releases.)

7. Buffer register sends memory the category code and the class charge code, indicating non-coin, station-to-station, sent-paid call. REG-TT sends called number to memory. (Buffer register, REG-TT, REG-I and SDR-I release.)

8. TRT-O generates "new call" signal to TSD link marker.

9. TSD link marker identifies TRT-O and gets queue "class" from memory category decoder.

10 TSD line marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "KP CG" lamp on. "ACS" lamp on. "CLD" lamp on. "Station Paid" lamp on. "Release FWD" lamp on. "Time ST" lamp on (red). "Non-Coin STA" lamp on. Home area code lamp on (216). (TSD link marker releases.)

11. Operator keys calling number. Operator presses "KP CG" key. "KP" lamp goes red, then green. Operator keys calling number. "RLS FWD," "KPCG" and "KP" lamps go dark. "Time ST" lamp goes green. Releases position. Operator presses "Pos. Rls" key. All lamps go dark. Releases ASW, BSW and CSW switches. The forward connection is started automatically after the keying of the calling number. REG-I is seized.

12. CSC sends called number to REG-I which connects to SDR-I.

13. SDR-I establishes connection through STT to called line. STT rings called station. (REG-I, SDR-I release.)

14. "Off-hook" from the called station causes TRT-O to store "answer time" in memory.

15. On completion of call, TRT-O causes "disconnect time" to be stored in memory. TRO is connected and all billing information is sent to the tape punch.

1. Calling party in tributary office dials "premium" access code, plus 419-468-2420. Call is connected to 1C trunk. REG-I is seized. (If dual-function or segregated trunks are provided, REG-I will receive "premium" mark.)

2. REG-I receives and stores called number and connects to SDR-I and TNS. (If access code is received, REG-I receives "premium" indication at this time.)

3. SDR-I establishes connection to TRT-O and REG-TT and marks for a "premium" call. (If "premium" indication has been received.) (TNS releases.)

4. REG-TT receives called number from SDR-I and "identity" tributary mark from trunk.

5. REG-TT calls buffer register and tributary tone receiver and passes first category digit indicating a 0+ call. (If "premium" indication has not been received, REG-TT just marks that called number has been dialed.)

6. Signal is passes to tributary to ask for calling number and category identification.

7. Tributary sends identity (MF) and tributary tone receiver causes buffer to store called number and second and third category digits indicating home NPA, "hotel" type substation. ("ST" signal from tributary indicates "premium" call, if required.) (Tributary tone receiver releases.)

8. Buffer sends MEM the calling number and category code. (Buffer releases.) REG-TT sends MEM the called number. (REG-TT, REG-I, and SDR-I releases.)

9. TRT-O generates "new call" signal to TSD link marker.

10. TSD link marker identifies TRT-O and get queue "class" from memory category decoder.

11. TSD link marker establishes connection to TSD. TRT-O scans MEM and passes signals to TSD to indicate kind and status of call. "ACS" lamp on. "CLD" lamp on. "Release FWD" lamp on. "KP GST" lamp on. Time and charge lamp on. "Time ST" lamp on (red.) "Hotel PPCS" lamp on. Home area code lamp on (216). (TSD link marker releases.)

12. Operator obtains details of call and enters "class-charge." Operator presses "SPL CLG" key. "SPL CLG" lamp on (red). MEM scan signals "class-charge" stored. "KP SPL" lamp on. "SPL CLG" lamp on (green).

13. Operator keys in billing number. Operator presses "KP SPL" key. "KP" lamp on (red), then (green). Operator keys credit card number. MEM scan signals billing number stored. "KP SPL" and "KP" lamps go dark.

14. Operator keys in extension number. Operator presses "KP GST" key. "KP" lamp on (red), then (green). Operator keys extension number. "KP GST" and "KP" lamps go dark. Starts forward connection. Operator presses "ST" key. "RLS FWD" lamp goes dark. REG-I is seized.

15. CSC sends called number to REG-I which connects to SDR-I AND TNS.

16. SDR-I establishes connection to OG trunk and outsends. (REG-I and SDR-I release.)

17. "Off-hook" signal sent from called office. "CLD" lamp goes dark.

18. Operator obtains called party and starts timing. Operator presses "Time ST" key. "Time ST" lamp on (green).

19. Operator releases TSD and ASW, BSW and CSW switches. Operator presses "Pos Rls" key. All lamps go dark.

20. On completion of call, TRT-O causes "disconnect time" to be stored in memory. TRO is connected and all billing information is sent to the tape punch and time and charge printer.

Claims

We claim:

1. A telephone central office switching system having at least one toll service desk (TSD), toll ticketing equipment (TRO), a plurality of toll recording trunks (TRT-O), a plurality of lines over which calls are initiated, a first switching means (SLA, GSA) including marker means for selecting an idle one of the toll recording trunks from said plurality of toll recording trunks and for connecting the calling line to the selected idle one of the toll recording trunks, means for providing a first signal set which identifies the calling line and a second signal set which provides the category of the calling line, a first register means (RTT) accessible to said toll recording trunk for storing the called number of a connection, a second register means (IBR) for storing the identification and category of the calling line provided by said first and second signal set, memory means (MEM) including means for storing calling and called information secured from said first and second register means (RTT and IBR), and category decoder means for ascertaining the need for operator assistance (CD) including decoding means (CD) for determining the category of the call represented by said second signal set stored in said memory means by said second register means, and call status means in said memory means for indicating the status of the call, position control means (TPC) for connecting said toll recording trunk to said toll service desk, visual display means on said toll service desk, and means in said memory means enabled by said toll recorder trunk (TRT-O) to transmit status information to said desk for display by said visual display means to the operator.

2. A telephone system as set forth in claim 1 which includes means in said category decoder means for transmitting a signal to said toll trunk recorder (TRT-O) to stop the forward progress of the call whenever said call status means in said memory means (MEM) determines further information is required for processing of the call.

3. A telephone system as set forth in claim 2 in which said toll recording trunk (TRT-O) includes connect means responsive to said signal from said category decoder means to release said first and second register means (RTT and IBR) from the connection.

4. A system as set forth in claim 3 which includes second switching means (ABC) accessible to said connect means and in which said connect means in said toll recording trunk (TRT-O) also enables said second switching means (ABC) in the selection of said position control means (TPC), and which operates means in said position control means (TPC) responsive to seizure by said second switching means (ABC) to prepare said toll service desk (TSD) for use in the call.

5. A system as set forth in claim 4 which includes a bypath circuit extending between said position control means (TPC) and said toll recording trunk (TRT-O), means in said position control circuit (TPC) responsive to seizure to signal said toll recording trunk (TRT-O) over said bypath circuit, and means in said toll recording trunk (TRT-O) for enabling said memory means to transmit kind and status information obtained from said category decoder means over said toll recording trunk (TRT-O) and said second switching means to said position control means (TPC).

6. A system as set forth in claim 1 in which said position control means (TPC) includes means for enabling said visual display means to display said kind and status information to the operator, and means on said toll service desk (TSD) for use by said operator in transmitting additional information required for the call to said memory means.

7. A system as set forth in claim 6 which includes code sending converter means (CSC), register sender means (REG-I, SDR-I), and means in said position control means (TPC) automatically responsive to completion of storage of the required information in said memory means to signal said toll recording trunk (TRT-O), and means in said TRT-O responsive to said signal to enable said code sending converter means (CSC) to transmit the called number stored in said memory means (MEM) via said toll recording trunk (TRT-O) to said register sender means (REG-I) for outpulsing.

8. A system as set forth in claim 1 which includes time information means for providing time information, and supervision means in said toll recording trunk (TRT-O) responsive to answer by the calling party to enable said memory means to store the answer time provided by said time information means.

9. A system as set forth in claim 8 which said toll recording trunk (TRT-O) includes means including said supervision means automatically responsive to a disconnect signal from the called subscriber to enable said memory means to store the time of disconnect provided by said time information means.

10. A system as set forth in claim 9 which includes billing means (TRO) for automatically providing a record of said call, and means in said memory means responsive to storage of said disconnect time for operating said billing means.

11. A system as set forth in claim 10 in which said toll recording trunk (TRT-O) includes recall means responsive to receipt of a recall signal during the period of an established connection thereover to effect reseizure of a toll service desk.

12. A system as set forth in claim 11 which includes first means responsive to a flashing hookswitch signal by a calling line to enable said recall means, and call timer means (CTM) for providing an enabling signal to said recall means.

13. A system as set forth in claim 12 in which said memory means includes means enabled by said first means to forward the answer time to said toll service desk (TSD).

14. A system as set forth in claim 13 which said call timer means (CTM) includes means for measuring the lapsed time of a connection, and which includes means in the position control means (TPC) responsive to a later operation of said first means in said toll recording trunk to control said call timer means to forward the lapsed time to said toll service desk (TSD) for display to the operator.

15. A system as set forth in claim 14 in which said toll service desk (TSD) includes means operable by said operator to change the class of call stored in said memory means (MEM) from one class to another.

16. A system as set forth in claim 15 in which said visual display means includes means for displaying a request from said memory means for a plurality of different sets of information, and key means at said toll service desk for transmitting said information sets to said memory means, and in which said memory means accepts said information sets from said toll service desk in any sequence.

17. A system as set forth in claim 1 in which said category decoder means includes means for automatically detecting calls from hotels, and which includes key means on said toll service desk including means for transmitting information relating to the hotel guest number over said position control means to said memory means for storage therein, and means in the position control means responsive to storage of such information in said memory means for controlling said toll recorder trunk to further extend the call through the system.

18. A system as set forth in claim 17 in which said category decoder means includes means for providing a predetermined signal set in response to detection of a coin call, and in which said toll recording trunk includes means for effecting forwarding of call information including the calling and called number from said memory means to said toll service desk for use by the operator in providing a charge for the call.

19. A system as set forth in claim 18 which includes means including said toll recording trunks for use in extending calls from incoming trunks over the system, and in which said category decoder means includes means for providing a predetermined class identification signal set responsive to detection of a call back which is forwarded over an incoming trunk as a result of an incomplete person-to-person call.

20. A telephone switching system as set forth in claim 1 in which certain of said lines comprise subscriber lines, and other of said lines comprise incoming trunks, and in which said second switching means includes means for establishing connections from said toll service desk to said toll recording trunk, and in which said toll recording trunk is operative to establish a connection to said memory means in response to a call from a subscriber line, or an incoming trunk, or said toll service desk.

21. In a telephone central office switching system having at least one toll service desk (TSD), billing equipment (TRO), a plurality of subscriber lines, a plurality of incoming trunks (IC), a common plurality of toll recording trunks (TRT-O), first switching means including a first set of paths for connecting said subscriber lines to said toll recording trunks, and a second set of paths (GSA and GSB) for connecting said incoming trunks (IC) to said toll recording trunks, second switching means including a third set of paths for connecting said toll service desk to said toll recording trunks, means for indicating the ones of said toll recording trunks which are available for access over said first, second, and third sets of paths, and means in each of said toll recording trunks for controlling engagement of said billing equipment (TRO) for toll calls established to the trunk over said first, second, or third paths.

22. An arrangement as set forth in claim 21 which includes a plurality of registers (RTT) for recording the called number and in which said toll recording trunks (TRT-O) are arranged in groups, each two groups of toll recording trunks having access to three of said registers (RTT's).

23. An arrangement as set forth in claim 21 in which a position control means (TPC) is provided for each toll service desk, and in which each toll recording trunk (TRT-O) has access to a plurality of said position control means over said second switching means.

24. A telephone central office switching system having non-coin lines, a toll recording trunk, and first means including said toll recording trunk accessible to said non-coin lines for use in extending toll calls over the system, a toll service desk, means accessible to said first means for selecting a toll service desk for temporary use in establishment of a call, means at said toll service desk for disconnecting said desk from said call, recall means in said toll recording trunk for effecting reselection of a toll service desk responsive to receipt of a predetermined signal from a non-coin line during the period a call is established thereover, clock means for providing answer time for a call, storage means, and means in said toll recording trunk for enabling storage of the answer time in said storage means.

25. A telephone central office switching system having non-coin lines, a toll recording trunk, and first means including said toll recording trunk accessible to said non-coin lines for use in extending toll calls over the system, a toll service desk, means accessible to said first means for selecting a toll service desk for temporary use in establishment of a call, means at said toll service desk for disconnecting said desk from said call, recall means in said toll recording trunk for effecting reselection of a toll service desk responsive to receipt of a predetermined signal from a non-coin line during the period a call is established thereover, call timer means, and means in said toll recording trunk for enabling said call timer means to forward the elapsed time to said toll service desk for display purposes responsive to operation of said recall means.

26. A telephone central office switching system having non-coin lines, a toll recording trunk, and first means including said toll recording trunk accessible to said non-coin lines for use in extending toll calls over the system, a toll service desk, means accessible to said first means for selecting a toll service desk for temporary use in establishment of a call, means at said toll service desk for disconnecting said desk from said call, recall means in said toll recording trunk for effecting reselection of a toll service desk responsive to receipt of a predetermined signal from a non-coin line during the period a call is established thereover, memory means having means for storing the called number during the period of a call, and key means in each toll service desk operable to control forwarding of the called number from said memory means, whereby rekeying of the number of the operator from a call is eliminated.

27. In a telephone central office switching system having subscriber lines, toll recording trunks, and means including said toll recording trunks accessible to said subscriber lines for use in extending calls over the system, memory means for storing information relating to the call including means for recognizing hotel subscriber calls, a toll service desk, means including said toll recording trunks responsive to detection of a hotel call to provide a display information requirement for guest room information on said toll service desk, and means at said toll service desk for keying the guest room information for storage in said memory means.

28. A system as set forth in claim 27 which includes means at said toll service desk for releasing the toll service desk and said memory means after storage of said guest room information in said memory means, and means including said toll recording trunk for enabling completion of the call via said toll recording trunk responsive to storage of said information in said memory means.

29. A system as set forth in claim 28 in which said toll recording trunk includes means responsive to answer by the calling party to effect storage of the answer time in said memory means.

30. A system as set forth in claim 28 which includes billing means, and in which said toll recording trunk includes means responsive to disconnect by the calling party to automatically effect transfer of the information in said memory means for the call to said billing means.

31. A system as set forth in claim 30 in which said billing means includes time and charge means for providing a time and charge ticket for immediate use.

32. A telephone central office switching system having incoming trunk lines, toll recording trunks, and means including said toll recording trunks for use in extending calls from incoming trunks over the system, a toll service desk, means accessible to said toll recording trunk for selecting a toll service desk for use in extending a call, means for detecting a call back which is forwarded over said incoming trunk as the result of an incomplete person-to-person call, storage means for storing the calling and called number of the call back, and means in said toll service desk for keying the calling and called numbers for said call into said storage means.

33. A system as set forth in claim 32 in which said toll service desk includes first key means for enabling said storage means to store the calling number, and second key means for enabling said storage means to store the called number, third key means for starting forward connection of the calling number subsequent to storage of the called number in said storage means, said calling number being the directory number of the party initiating call.

34. A system as set forth in claim 33 in which said toll service desk includes means for initiating timing of a call after answer by the calling party, and means for thereupon releasing the toll service desk from the call.

35. A system as set forth in claim 34 which includes automatic billing means, and means for enabling said automatic billing means to make a permanent record of the call information in said storage means responsive to a disconnect signal.

36. A telephone central office switching system having at least one toll service desk (TSD), a plurality of incoming trunk lines, first switching means, a toll recording trunk (TRT-O) accessible to said incoming trunk lines over said first switching means for use in extending connections toward a called number, memory means accessible to said toll recording trunk including means for storing the class charge of call, and category decoder means responsive to said signals to provide an identification to the toll service desk (TSD) of the additional information required, second switching means (ABC) accessible to said toll recorder trunk for use in seizing said toll service desk (TSD) for use in the extension of the call, means at said toll service desk for keying a class charge into said memory means along with the calling and called numbers which are verbally received by the operator, means at said toll service desk for enabling said memory means to start the call forward over said toll recording trunk to the calling number, means at said toll service desk for initiating timing of the call with answer by the called party, and means for releasing the toll service desk from the connection.

37. A telephone central office switching system having at least one toll service desk (TSD), a plurality of subscriber lines including non-coin subscriber lines, means including a toll recording trunk (TRT-O) accessible to said subscriber lines for use in extending calls of different classes over the system, register means accessible by said toll recording trunk for automatically providing a class-charge for a call, memory means for storing the class charge of the call provided by said register means including means in said memory means for signalling said register means to control said toll recording trunk to seize a toll service desk (TSD) for use in the extension of the call, class-charge means at said toll service desk operable by the operator to selectively change the class-charge of a call stored in said memory means from one class-charge to a different class-charge during the call, means in said toll service desk for releasing the desk from the connection, and recall means in said toll recording trunk operable by a non-coin subscriber line during the call to reselect a toll service desk for further assistance.

38. A system as set forth in claim 37 in which said class charge means are operable to change the class-charge from a station-to-station class-charge to a person-to-person class charge, and from a person-to-person class charge to a station-to-station class charge.

39. A telephone central office switching system having subscriber lines, toll recording trunks, and means including said toll recording trunks accessible to said subscriber lines for use in extending toll calls over the system, a toll service desk, means accessible to each toll recording trunk for selecting a toll service desk for temporary use in the establishment of a call, call timer means, means for automatically enabling said call timer means to time non-coin calls extended over said trunk, means at said toll service desk for releasing said desk from a non-coin call when the connection is made, recall means for effecting reconnection of a toll service desk to the non-coin call responsive to a signal from the calling party, and means responsive to operation of said recall means a predetermined period after start of the non-coin call to forward the answer time to said toll service desk for display purposes.

40. In a telephone central office switching system having incoming trunks over which calls are received, toll recording trunks, and means including said toll recording trunks accessible to said incoming trunks for use in extending calls over the system, toll service desk means accessible to each toll recording trunk for selecting a toll service desk for temporary use in the establishment of a call, means for forwarding the call from said toll recording trunk to a called station, release means at said toll service desk for releasing the toll service desk from said call, and recall means for reselecting a toll service desk for connection to the call in response to a signal received over the incoming trunk.

41. A system as set forth in claim 40 in which said call timer means is operative to automatically provide elapsed time of the call to said toll service desk.

42. A system as set forth in claim 40 which includes means at the toll service desk for enabling the operator to provide time and charges to the called party for a call received over said incoming trunk.

43. A system as set forth in claim 40 which includes automatic billing means for providing a record of certain of said calls.

44. A system as set forth in claim 40 in which station having the called number is a coin telephone and which includes release means at the toll service desk for releasing the toll service desk from said call.

45. A system as set forth in claim 40 which includes call timer means for operating said recall means a predetermined period after start of the call to effect reconnection of a toll service desk to the call.

46. A system as set forth in claim 40 which includes automatic billing means for providing a permanent record of incoming calls, and in which said toll service desk includes means operable by the operator to prevent said billing means from providing a charge for such call.

47. In a telephone central office switching system at least one toll service desk (TSD), a plurality of toll recording trunks (TRT-O), a plurality of lines over which calls are initiated, switching means including marker means for selecting an idle one of the toll recording trunks from said plurality of toll recording trunks and for connecting a calling line to the selected idle one of the toll recording trunks, means for providing a first signal set which identifies the calling line and a second signal set which provides the category of the calling line, register means (RTT and 1BR) accessible to said toll recording trunk for storing the identification and category of the calling line provided by said first and second signal set, memory means (MEM) including means for storing the information secured from said register means, and category decoder means for ascertaining the need for operator assistance (CD) including decoding means (CD) for determining the category of the call represented by said second signal set stored in said memory means by said register means, and means in said memory means for enabling said toll recorder trunk to select said toll service desk for use in extending the call as required.