Patent GB-145034-A (GB)
Abstract: 145,034. Western Electric Co., (Assignees of Polinkowsky, L.). June 4, 1919, [Convention date]. Automatic exchange systems; metering systems. -The operation of a subscriber's meter is dependent on the setting of the register-controller, so that calls through the main exchange are metered, whereas calls local to a satellite are not. In the system described, the metering-battery 259 is connected over contact 212 to the subscriber's meter as the sequence switch 220 passes through positions 14 to 16 during the release of the connexion, provided that the relay 277 has been energized during the setting up of the connexion. The relay 277 is controlled by a relay 276 in series with the tripping-spindle power-magnet 248, the relay 277 being thus connected, during the operation of the first selector, to wire 297, which is earthed over contact 358, except when a local call is made, in which case the relays 382, 383 are energized over contacts 406, 416, and 427 of the ten-thousands, thousands, and hundreds registers 400, 410, 420 respectively. Connexion to, and operation of, idle register. This proceeds substantially in the same manner as in Specification 141,080, except that as the capacity of the exchange is assumed to be 20,000 lines, the controlling sequence switch 320 has more operative positions, and five registers 400, 410, 420, 430, 440 are used, responsive to the ten thousands, thousands, hundreds, tens, and units digits respectively, in the 3rd, 5th, 8th, 10th, and 12th positions of the switch 320. Connexion to line in the same satellite. It is assumed that the subscribers on the satellite are numbered from 22,500 to 22,890. As the impulsesenders transmit numbers of impulses complementary to the digits required, and the register 400 moves an additional step as described in the above-mentioned Specification, the register 400 will be in position 9, register 410 in position 8, and register 420 in one of the positions 2 to 5. When these three registers have been set, the switch 350 moves out of its 1st position, so that relays 382, 383 are energized over contacts 406, 410, 427, and 372. Relay 382 closes a further circuit to move switch 350 into its fifth position, so that the selecting-operations which normally take place under control of registers 400, 410 in positions 3, 4 of switch 350 are omitted, and the group selector, Fig. 2, is controlled by the hundreds register 420 to select a local final selector. In the 5th position of switch 350, the relay 222, Fig. 2, is energized over contact 247, wire 269, stepping-relay 355, contact 380, and armature of relay 382. Relay 222 moves switch 220 into its 6th position, in which magnet 248 rotates the tripping-spindle, contact 250 short-circuiting the stepping-relay 355 in the usual way, thus stepping-on the register 420 in known manner. When the register 420 reaches normal, switch 350 is moved into position 6, opening the circuit of relay 22, which moves switch 220 into position 7 wherein an idle final selector 217 is found in the usual way. The switch 220 then moves into position 9, in which the fundamental circuit is extended to the final selector and the wanted line selected under control of registers 430, 440. When the selection is completed, switch 220 moves into position 10, and when the called subscriber answers into position 12. When the calling party replaces his receiver, the switch 220 moves to position 17, but as the relav 277 has not been energized, the metering-battery 259 remains disconnected and the connexion is released without metering. Connexion to main exchange. In this case the relays 382, 383 are not energized, and the switch 350 comes to rest in position 2, closing the circuit of relay 222 over wire 269, stepping-relay 355, and contact 356. Relay 222 moves switch 220 into position 6, in which the trip spindle rotates as before. Relay 276, in series with the tripspindle power magnet, is energized and connects the relay 277 to wire 297, which in a non-local call is earthed over contact 358. Relay 277 is energized and locks up, connecting up the metering battery 259, which is connected to the subscriber's meter during the release of the apparatus in the usual way. If the connexion is not completed, or if the called subscriber does not reply, the metering-preventing relay 224 is energized in the 11th position of switch 220, and prevents the call being metered. If it is desired that calls to certain exchange officials shall not be metered, the earth connexion of contact 358, Fig. 4, is replaced by the connexions shown in dotted lines, and the numbers allotted to these officials are such that the contacts of registers 400, 410, associated with this alternative connexion, are both opened when these numbers are registered, thereby preventing the energization of the metering relay 277. After the selection of an idle trunk to the main exchange, a set of registers at the main exchange are operated in accordance with the setting of the registers 410, 420, 430, 440 and control the selection of tho wanted line by selectors 266, 267, 268 as described in Specification 146,517.