Patent GB-143830-A (GB)
Abstract: 143,830. Western Electric Co., (Assignees of Deakin, G.). May 26, 1919, [Convention date]. Automatic exchange systems; metering systems.-In systems of the register-controller type, the registers indirectly govern the calling-subscriber's meter so as to operate it differently, according to the character of the call established. In the example, described calls to subscribers whose ten-thousand digit is 1, 2, 3, 4, 7, 8, or 9 cause a single operation of the meter independently of the duration of conversation, while calls to subscribers whose ten-thousands digit is 5 or 6 cause repeated operation of the meter at timed intervals as long as conversation is in progress, the intervals being of different lengths for these two values of the digit. A subscriber can connect himself to a special service position by calling the digits 01, in which case his meter is not operated. The meter 58, Fig. 1, is operated by a booster battery 120 when a sequence switch 100 passes through its 2nd to 5th positions. The switch 100 either makes a single cycle when the called subscriber answers, or else moves continuously through a succession of cycles at a rate determined by which of two interrupters 113, 114 has been brought into circuit. The choice between these alternatives is determined by the position to which a sequence switch 130 has been brought, which in turn is determined by the setting of the registers. Apart from metering, the switch 100 serves as a monitoring-device, for giving warning of uncompleted calls, or of false calls due to faults, or for releasing the connexion in case of failure of the calling- subscriber to disconnect himself within a given interval of the called subscriber doing so. Specification 143,277 is referred to. Connexion of calling-line to idle first selector and register-controller. A calling-line is connected to the first-selector circuits shown in Fig. 1, by first and second line-finders, and an idle register-controller, Fig. 3, is connected to the same circuits by a pair of finders 201, 202, Fig. 2, which, though they operate separately, have practically the function of a single hunting-switch. When the second line-finder completes its connexion, the test relays 147, 141, Fig. 1, are energized as usual, and the switch 130 moves to its 4th position, open-circuiting relay 136, which was energized by the common starting-relay 16. Relay 150 is now energized in series with marginal relay 143 (which does not respond) and closes a circuit for relays 160, 161, 164; at the same time, the relay 205, Fig. 2, of each idle register-controller is energized in a circuit closed by the contact 146, and completes a driving-circuit for the power magnet 210 of the " in " finder 201. When this finder completes its connexion, the test relays 215, 213 are energized and the switch 230 is moved to its 4th position, energizing relay 253, which connects the stepping-relay 243 to the brushes 216, 217. At the same time, the closure of contact 246 short-circuits relays 215, 213, 150 and energizes marginal relay 143, which opens the common register starting-circuit. The relapse of relay 150 opens the circuit of relays 160, 161, 164, and relay 160 completes the connexion from the calling-line to the stepping-relay 243, which becomes energized. A tone signalling device 248 is at the same time brought into action. Meanwhile the " out " finder 202 has followed up its companion 201, the power ma.gnet 220 having been energized in the locking-circuit closed by the relay 205 through its right-hand winding. This locking-circuit is opened by the energization of relay 225 when the test-brush 229 comes on to the terminal energized by the corresponding brush 219 of the " in " finder. Signalling uncompleted calls or false calls due to faulty lines. In the 4th position of switch 130, circuits are closed through contacts 149, 145 to drive the switch 100 to its 7th position, and the intermittent energization of relay 136 by interrupter 114 closes circuits for driving it slowly to its 12th position, whence it is driven over contact 145 to its 13th position, and then a.gain by relay 136 to its 17th position. The circuit of relay 243 is now opened at contact 106, and the continued de-energization of this relay causes a train of operations by which (1) switch 230 is driven round to normal, (2) switch 350, Fig. 3, is driven round from normal to normal, (3) as switch 350 passes its 2nd position it closes a circuit for driving switch 130 to its 5th position, closing a circuit 145, 108 for driving switch 100 to its 18th position, in which a monitoring-lamp 119 is ignited. Relay 150 is now again energized (being no longer short-circuited by contact 246) and holds open the circuit through contact 107 bottom, so that switch 100 remains in its 18th or signalling position. In answer to the signal 119, an attendant may connect himself to the calling-line at jack 118 (having first thrown a holding-key 115 to open-circuit the release relay 158) to test the line and ascertain if the call was due to a fault. Setting of the registers. The switches 130 and 230 being in their 4th positions, the subscriber's impulses operate the stepping-relay 243 which controls the differential relay 241 to set the registers 340 - - 300, Fig. 3, in known manner, switch 230 being moved to a fresh position at the termination of each series of impulses by a sluggish relay 240 (energized by the final prolonged impulse of each series) and relay 237. When all the registers have been set, switch 230 is in its 16th position. Operation of the selectors under control of the registers; release of the register-set. When switch 230 moves to its 6th position, after the setting of the first register, contact 232 closes a circuit for driving switch 350 to its 3rd position, and contact 375 passingly closes a circuit for driving switch 130 to its 5th position, closing a circuit 145, 108 for driving switch 100 (which is being slowly stepped round as described in the last paragraph but one) immediately to its 18th position, whence it is driven on again to normal by a circuit through contact 107 and the righthand back contact of relay 150. The signal'lamp 119 is therefore only momentarily energized. With the switches 130, 350 in their 5th and 3rd positions, a fundamental circuit is closed through relays 136, 373, and relay 136 drives a switch 130 to its 6th position, in which the magnet 160 of the brush-choosing spindle is energized. The selective operation now proceeds in known manner, the rotation of the brush-choosing spindle intermittently short-circuiting relay 373, which operates the differential relay 378 (in a circuit 374, 256), which steps forward the register 340. When the register regains its zero position, it closes a circuit for relay 370, which opens the fundamental circuit, and for switch 350, which moves to its 4th position. The relapse of relay 136, at the other end of the fundamental circuit, opens the driving-circuit of magnet 160 and drives switch 130 to its 7th position, in which the brush carriage magnet 170 is energized, and the selected brushes are tripped and advanced to the terminals of an idle trunk. The energization of the test relays 147, 141 then drives switch 130 to its 9th position, relay 141 also open-circuiting the power magnet 170. Switch 350 now moves to its 5th position (provided that the setting of the second register has been completed so that switch 230 has reached its 7th position), and the fundamental circuit is again closed through relay 373 and a relay of the second selector, and the setting of this and of the subsequent selectors proceeds on the lines already described, circuits being finally closed, when all the registers have functioned and returned to zero, for restoring switches 350, 230 to normal. During these operations, switch 130 is moved to its 11th, 13th, or 15th position, according to the setting of the first register 340, this being effected as follows :-If the first register has been set to its 6th position, the passage of switch 350 through its 2nd position closes, at contact 366, circuits for energizing relays 367, 376, which lock themselves up; if the register is in its 5th position, only relay 367 is energized, and in other positions neither relay is energized. When switch 350 runs through its 6th position, it closes a circuit 363, 375, 228, 137 for driving switch 130 to its 11th position; when running through its 8th position, and supposing relay 367 has been energized, it closes a circuit 388, 228, 137 for driving switch 130 to its 13th position; and when running through its 13th position, and supposing relay 376 has been energized, it closes a circuit 388, 228, 137 for driving switch 130 to its 15th position. Switch 130 remains in whichever of these three positions it has been set, until conversation is finished. When switch 230 left its 15th position, the short circuit of relay 150 at contact 246 was removed, and relays 150, 160. 161, 164 were again energized. Metering. When the called subscriber answers, relay 163 is energized over the called line and closes a circuit 151, 107 to start the switch 100, which moves to its 6th position and passingly closes a boosting-circuit 120, 111, 155, 154 to energize the meter 58. It has been explained in the previous paragraph how switch 130 has been brought to its 11th position if the first digit of the called number is 1, 2, 3, 4, 7, 8, or 9, to its 13th position if this digit is 5, and to its 15th position if the digit is 6. In the first case, switch 100 remains in its 6th position, and the meter is only operated once, a circuit 145, 107 is closed for moving switch 100 to its 7th position, and relay 136 is then intermittently energized over contacts 104, 135 by interrupter 113 or 114, and closes circuits for moving switch 100 through successive cycles, at a rate depending on which interrupter is in action, as long as con