Patent GB-700343-A (GB)
Title: Improvements in automatic telephone systems
IPC: H04M15/04
Filed: 1948-06-17
Abstract: 700,343. Automatic exchange systems. WESTERN ELECTRIC CO., Inc. June 17, 1948 [June 18, 1947], No. 16315/48. Class 40 (4). In an automatic ticketing system, information in respect of calls set up over a plurality of trunks is recorded on a single recorder common to the trunks, each entry including an " entry number " which indicates the nature of the information contained therein, e.g. calling line number or called party answer time, and the number of the trunk concerned in the call. Thus the four entries for each completed call can be associated to give a complete record thereof. General description of systems : Fig. 32. A calling station 1, 2, or 3 is connected by a line-finder 5, 6, or 7, to a first selector 8, 9, or 10, and upon receipt of dialling tone, the calling party dials the office code and number of the wanted party in the usual manner. When the calling station has been connected to a trunk 11 by the operation of one, two, or three selectors as the case may be, the next digit dialled is registered in the trunk. A trunk finder 15 connects a sender 16 to the trunk 11 and the remaining digits dialled are registered in the sender. An identifier 17 is also connected to the trunk by an identifier-trunk connector 18 and to the sender by an identifier-sender connector 19. The identifier determines the office code dialled by the calling station in the manner disclosed in Specification 700,341 and transfers this information to the sender, which then controls the setting up of the required connection to the called station 20 through the terminating office 24. The identifier also determines the office and directory number of the calling station. The information in respect of all calls to be ticketed is recorded on a tape by a recorder 21 of the type disclosed in Specification 610,413, [Group VIII], common to a plurality of trunks, each item when recorded including the number of the trunk over which the call is set up and a " type of entry " digit which indicates whether the entry is in respect of calling party identification, called party identification, time of called party answer, or time of end of conversation. The four entries corresponding to any call may thus be recognized and charging be made in accordance therewith. The recorder is seized by the trunk which controls it to record characters representing the trunk number and the type of entry. The identifier then causes the recorder to perforate its tape with characters representing the office code and number of the calling station, after which the recorder tape is moved to a new position in readiness for the next entry, and the identifier and recorder are released. When the called line information has been registered in the sender, the sender is connected to the trunk by the sender-trunk connector 25 whereupon the trunk again seizes the recorder and causes the recording of its number and the type of entry digit. The sender then controls the recorder to record the office code and number of the called station. The sender and recorder are then released. On the reply of the called party the trunk again seizes the recorder and the number of the trunk and the type of entry digit are recorded. A dav and hour circuit 22 also controls the recorder to record the interval of time in which the answer occurs, after which the recorder is again released. When either party hangs up, the trunk again seizes the recorder and the number of the trunk and the type of entry digit are recorded, the day and hour circuit again controls the recording of the time at which this occurs, and the recorder is again released. Initial entries are made in respect of uncompleted calls but the '' called party answer " and " disconnection " entries do not appear on the record thus allowing such calls to be recognized and not charged. Detailed operation : Assuming that the party at station 2 (Fig. 1) initiates a call by removing his receiver from its rest, line finder 6 operates in well-known manner to connect the calling station with first selector 9 and the caller receives dialling tone. The first two digits dialled operate first selector 9 and second selector 12 respectively to extend the calling line to a trunk (Figs. 2, 3, 4) in which relay A (Fig. 3) pulls up to the loop. Relay B follows and brings up SX, thus connecting the ground at the lower back contacts of D (Fig. 4) over the sleeve conductor 59 (Fig. 2) to hold selectors 9 and 12 (Fig. 1). Ground at lower back PB (Fig. 3) is connected over a front contact of B and conductor 60 to the trunk finder 15 (Fig. 2) of well-known type, which connects up the sender (Figs. 8 to 11, 13 to 16, 18 to 21, 24 to 27 and 29 to 31, not shown). Relay A repeats the next digit dialled (in this case the third) to the rotary magnet ROT of switch DS (Fig. 2), relay C (Fig. 4) coming up for the duration of the train. As soon as a sender has been connected up by the trunk finder relay SLV (Fig. 3) operates to ground in the trunk finder over conductor 64, and TR (Fig. 2) pulls up to ground at a back contact of D (Fig. 4) over SLV front. If however a sender has not been associated with the trunk by the time C falls away at the end of the digit, the release of A to the first impulse of the next digit brings up PH (Fig. 3) over back contacts of C and TR, followed by PB which connects busy tone over the ring conductor 53 to the calling station, and removes the ground from conductor 60 causing the trunk finder to disconnect the sender from the trunk. Assuming TR to have been operated as a result of the association of a sender before the release of C, A and B are released while SX holds over a front contact of SLV to ground on back CT (Fig. 2), and the calling line is extended over conductors 72 and 73 of cable 87 to the sender. The impulses of subsequent digits dialled are counted by a relay chain PI, . . . P6 (Fig. 25, not shown) and the digits are registered in the sender on some or all of five groups of register relays. When the first digit has been registered in the sender an identifier preference relay is operated and an idle identifier is connected to the sender and subsequently to the trunk. Battery is extended from the identifier via the sender over conductor 86 of cable 87 (Fig. 2) to the trunk finder and thence over conductor 88 through the two windings of IC is series to ground at the upper back contact of D (Fig. 4). Relay IC which is polarized actuates its lower set of contacts only, thus removing the short-circuit from coil C1 and extending conductor 93 from the identifier to the sleeve 59 of the trunk and thence over the sleeve 95 of the calling station to the identifier. Relay IC also extends a lead from the identifier connected to conductor 96 of cable 94 (Fig. 2) to the brush of DS the bank terminals of which lead to the identifier also, and connects conductor 100 to the identifier. By means of these circuits the identifier operates in the manner described in Specification 700,341 to reconstruct the office code dialled and register it in the sender, and to identify the office and number of the calling line and to register them .also. When the identification of the calling line is completed the identifier applies battery to conductor 102 of cable 103 to operate the preference relay TKP1 (Fig. 5) associated with the trunk. Relay RA1 (Fig. 4) follows, controls the connection of the identifier to the recorder (Fig. 6) and brings up TKE and TDE1 (Fig. 5). Magnets and M4 (Fig. 6) are then operated to punch the recorder tape with the digit " 4 " -the " type of entry " digit indicating calling line information. The lower four front contacts of TKE (Fig. 5) are cross-connected to two of the magnets M6 to M10 and two of M11 to M15 to record the two-digit number of the trunk. The calling station office register relays (not shown) of the identifier extend ground over conductors of cable 110 (Fig. 6) to operate two magnets of each group M16 to M20, M21 to M25, and M26 to M30 to record the calling office code. Similarly other conductors of cable 110 are grounded by the calling number register relays (not shown) to record the calling number on magnets M31 to M50. Contacts of the magnets M1 to M50 are interconnected so that when two out of each group of five magnets are operated a circuit is completed for stepping magnet SM, which operates causing the disconnection of the identifier from the trunk and from the recorder. Relays TKP1 (Fig. 5), RA1 (Fig. 4), and TKE (Fig. 5) are released, followed by the punch magnets, whereupon SM relapses and moves the recording tape in readiness for the next entry. On the release of RA1 relay IDE2 (Fig. 5) operates in series with IDE1 and when all the called line information has been registered in the sender a preference relay associated with the sender operates and the sender is connected to the recorder. Relay TKP1 (Fig. 5) comes up followed by RA1 and TKE as before and SNE1 operates. Punch magnets M1 and M3 are thus operated to record the " type of entry " digit " 2 " indicative of called line information. The lower front contacts of TKE cause the trunk number to be recorded as before and the sender register relays also operate further punch magnets to record the called office code and number. SM operates again and TKP1, RA1, and TKE release. The sender is disconnected from the recorder and from the trunk. Relay SNE2 (Fig. 5) operates in series with SNE1. When the call has been extended to the called station ground is applied at the terminating office 24 to conductor 143 (Fig. 1) and is extended by the trunk finder to conductor 88 (Fig. 2) thus operating TC to close its upper contacts and open its lower ones. Relay CT (Fig. 2) pulls up, holds IC, and operates release magnet RLS of DS which homes the switch. CT also extends the calling line to the left-hand windings of repeating coil C2 (Fig. 2), and the right-hand windings of the coil to the trunk to the called station, relay S (Fig. 3) pulling up to