Patent GB-770360-A (GB)
Title: Automatic toll ticketing telephone systems
IPC: H04M15/38
Filed: 1955-02-14
Abstract: 770,360. Automatic exchange systems. AUTOMATIC ELECTRIC LABORATORIES, Inc. Feb. 14, 1955 [Feb. 12, 1954], No. 4351/55. Class 40 (4). A subscriber on a first exchange wishing to call a subscriber on a second exchange dials appropriate digits to gain access to a repeater, dials his own directory number for registration in a recorder associated with the repeater, and then dials the wanted number which is also registered in the recorder, the repeater extending the connection to the wanted subscriber. The system is somewhat similar to that described in Specification 692,999. Toll-ticketed call from subscriber in exchange A to subscriber in exchange B. When a subscriber at substation A1 on a party-line closes his loop he gains access to a first selector 122 in the manner described in Specification 368,716. Local calls are made direct, but for a call to another exchange the subscriber must dial two preliminary digits 00. The first digit seizes an idle toll-ticket repeater 100, Figs. 1-7, to energize local line relay R140 which energizes local hold relay R240. R240 busies the repeater and operates hold relay R260. Local line relay R140 follows the impulses of the second preliminary digit 0, pulse control relay R320 pulling up and remaining up until the end of the train. The first restoration of R140 energizes the first relay R600 of a counting chain R600-R690. When R140 reoperates, a first transfer relay R570 energizes in series with R600 to operate first pulse relay R290 which locks up. The second release of R140 energizes R610 and when R140 again reoperates, a second transfer relay R580 energizes in series with R610, and restores R570 and R600. Subsequent impulses operate R620-R690 in turn under the control of transfer relays R570-R590. Automatic registration of calling party on party-line. As each of the counting relays R600-R690 energizes it prepares circuits to one or more marking relays R520-R550. The dials at the several stations on the party line have cams such as 832, whereby the nth substation transmits a ground impulse immediately following the nth dial impulse. This pulse reverses the flow of current through polarized party relay R150 which therefore operates, local line relay R140 being meanwhile held operated. According to the counting relay then energized so R150 operates one or more of calling-station marking relays R620-R550 to register the last digit of the directory number of the calling subscriber in the bank of calling station digit register 501. Conditioning of toll-ticket repeater for reception of calling number digits. Operation of the tenth counting relay R690 energizes the 0-digit dialled relay R280 which locks up and operates line relay R170 to condition the repeater to respond to subsequent dialled digits. R280 disconnects the circuit to transfer relays R570-R590 and the counting relays R600- R690. R170 transfers the calling loop from R140 and R150 to line relay R160 which pulls up. Line relay R160 operates release relay R250 which maintains local hold relay R240 and prepares a circuit to impulse control relay R230. Failure. If the subscriber had dialled a second digit other than 0, R280 would not have operated and R140 would have remained energized during the interdigital pause. Pulse control relay R320 would then restore and failure relay R130 would pull up to return busy tone and operate an alarm until the subscriber hung up. Registration of calling station directory number. The subscriber now dials the four digits of his own directory number. Line relay R160 repeats the impulses to impulse control relay R230, pulse control relay R320 holding up during each train. Impulse control relay R230 enters the digits into the hundreds, tens, units, and station registers 401, 402, 403 and 501, transfer being effected by relays R330- R355, R415. R230 also delivers each digit to the impulse counting relays R600-R690. At each interdigital pause pulse control relay R320 falls back so that the digit set up on counting relays R600-R690 is transferred to perforating magnets in a perforator of the type described in Specification 693,154, after which punch relay R220 operates slowly to energize the punch magnet in the perforator. Operation of R220 also restores the operated transfer relay R570- R590 and counting relay R600-R690, whereupon the punch relay and punch magnet restore to advance the tape one step. When the fourth digit is registered R410 pulls up to disconnect the impulsing circuit from the registers. Verification of calling number. Verification is performed in two stages, first of the number of the station on the party line and second of the number of the line. If the station digit dialled and therefore used to set wiper 515 of register 501 is the same as that set up on the contact bank of register 501 by the dial cam 832, then calling station matching relay R270 operates during the interdigital pause. R270 seizes the trunk selector 215 associated with the repeater so that it can respond to subsequent dialled digits. R270 also energizes verification start relay R360 which starts a verifier allotter 373 of the type described in Specification 749,171. The verifier allotter searches for and finds the repeater to connect it to a verifier 372 and then operates verifier hold relay R420, so restoring R360. The verifier is of the type described in Specification 749,171 modified to handle 1000 lines. R420 operates R450 which operates slow-to-release verification signal relay R760 and connects registers 401, 402, 403 to the verifier. The verifier selects a conductor, say S111, individual to the digits dialled. If this conductor corresponds to the calling line a battery impulse supplied by verification signal relay R760 sent over the C conductor operates verification check relay R750. If the numbers do not agree then verification failure relay R770, normally cut out by R750, pulls up slowly to operate an alarm and operate failure relay R130 which returns busy tone. R130 also shunts contacts 161 to prevent transmission of further dialled impulses. The verifier and allotter are dismissed by R750 or R770, as the case may be. Registration of called number and completion of connection. The first digit of the called number selects at 215 an idle trunk repeater 216 extending to the wanted exchange. Subsequent digits are sent over the line to complete the connection in known manner. The digits of the called number are repeated by impulse control relay R230 to the counting relays R600-R690 for registration on the tape. Controlling perforation to register duration of conversation. When the called party answers answer relay R210 pulls up to energize conversation time control relay R710. R710 energizes R720. R710 also energizes punch relay R220 which, as the perforating magnets are unoperated, causes the tape to advance one step. R710 also operates R730 slowly to restore punch relay R220, and causes time pulse conductor C736 to transmit a ground pulse every 6 seconds to the dial pulse counting relays R600-R690. The first pulse energizes R600, transfer relay R570 and punch relay R220 to enter the digit 1 on the tape. R220 energizes R560 to restore punch relay R220. Succeeding pulses step on the counting relays without punching until R690 operates after one minute and because R720 is still up the digit 1 is again entered on the tape. Subsequent minutes of conversation are recorded in the same manner. When the calling subscriber hangs up, line relay R160 falls back to restore release relay R250. R160 also releases the switching apparatus in the called exchange. R250 restores local hold relay R240 which interrupts the circuit to the counting relays and restores the switching apparatus in the calling exchange, but withholds the toll ticket repeater from further service until information in a dater-timer 371 has been entered on the tape. The dater-timer is of the type described in Specification 522,094. A pulse on conductor C201 energizes timer connect relay R310 which connects the marking and punch conductors to the dater-timer. The date and time of day are'then entered on the tape, and cut-off relay R320 energizes to operate R790 to cause the perforator to insert an end-of-message signal on the tape. R320 also restores the repeater.