Interfacing circuit status detection arrangement in a telephone

Details Interfacing circuit status detection arrangement in a telephone Interfacing circuit status detection arrangement in a telephone

1979-06-20

1981-10-27

Brown, Thomas W.

179 18ES, 179 18FG, H04M 322

Patent

active

042975328

ABSTRACT:
There is provided a telephone exchange including a switching network, a plurality of interface circuits whose corresponding transmit/receive paths are connected to the switching network, a data generator connected to the interface circuits to sequentially generate state information indicative of the states of the interface circuits, and a control circuit for controlling the switching network according to an output data from the data generator. The data generator generates state-variation information when the state of the interface circuit is varied and the control circuit is responsive to the state-variation information from the data generator to cause the switching network to be set to a state corresponding to the above-mentioned state information.

REFERENCES:
patent: 3787635 (1974-01-01), Kammerl et al.
patent: 3980833 (1976-09-01), Calcagno et al.
patent: 4095054 (1978-06-01), Anizan et al.
patent: 4117278 (1978-09-01), Ehrlich et al.
patent: 4154988 (1979-05-01), Fechalos et al.
"Number 1 ESS Scanner, Signal Distributor and Central Pulse Distributor", by L. Freimanis et al., vol. 43, 1964, Bell System Technical Journal, pp. 2255-2266.
"Horizon Communication System-An Advanced Technology System for Small Business Customers", by T. M. Quinn, Private Electronic Switching Systems, (International Conf., Apr. 1978), IEE Conference Publication No. 163, pp. 70-75.

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