Patent GB-663715-A (GB)
Title: Automatic switching system applicable to telephony and telegraphy
IPC: H04M15/08
Filed: 1946-01-14
Abstract: 663,715. Automatic exchange systems. COMPAGNIE GENERALE D'ELECTRICITE. Jan. 14, 1946 [March 31, 1943], No. 1204/46. Class 40 (iv). [Also in Group XL (b)] Means for identifying, e.g. for metering purposes, a calling line which has been connected over a link-circuit to a register-controller, comprises an identifying switch associated with the register-controller and set under the control of a circular test circuit including a current source individual to the register-controller, wipers of the identifying switch and the link-circuit callfinder and a marking wire connected between the banks of these wipers. In the system shown, a calling line is connected over a primary finder RC2 and a secondary finder RC1, both of 100-line capacity, to a link circuit with which is then associated over a finder Ch a registercontroller containing an individual source of direct-current obtained from a transformer TF1 through a rectifier network Rd1 ... Rd4. For calls requiring identification of the calling party, auxiliary registering mechanism including two identifying switches RC, RA is associated with the main register-controller over a finder CT. A sequence switch H, having contacts a1 &c. closed in the positions shown, controls the identifying operations. In position 1 of the sequence switch, the magnet of switch RC is operated over contacts b and when wiper b reaches the terminal connected to multipled marking wire Sc, relay 2 operates over this wiper, wiper S of RC1, wiper S1 of Ch, the individual source in the main register and wiper S of CT. Relay 3 operates over sequence switch contacts c1 and switch H moves to position 2 in which relay 3 is short-circuited and the magnet of switch RA operates over wiper c of RC. When wiper a of RA reaches multipled marking wire Sa, relay 2 operates again over wipers a of RC and RA, wipers S of RC2, RC1 and the individual source. The sequence switch H moves to position 3 in which relay 4 (previously energized and locked) is short-circuited over contacts c3 and the normal contacts of bank a of a counting switch G. The release of relay 4 connects up a pair of self-interrupting relays 5, 6 and moves switch H to position 4. Relay 5 sends pulses over contacts a4 to a printing register and also to the magnet of counting switch G until relay 4 operates over bank a of G and contacts c4, the number of impulses corresponding to the first digit of the calling party's number being thereby transmitted to the printer. This digit (ten thousands) is fixed and one terminal of bank a of G is permanently wired to contacts c4. Relay 4 cuts off the impulsing relays and moves switch G to its home position in which relay 4 is again short-circuited and switch H moves to position 5., Four-further digits representing thousands, hundreds, tens and units are similarly sent in positions 5-8 of switch H over contacts c5 ... c8 in accordance with multiplings between bank a of switch G and banks e, d of RC and g, h of RA respectively. The Specification as open to inspection under, Sect. 91, which does not admit of satisfactory abridgment, describes and illustrates a complete telegraph system of which the description and drawing of the accepted Specification form only part.