Subscriber's line equipment for a telephone exchange

Details Subscriber's line equipment for a telephone exchange Subscriber's line equipment for a telephone exchange

1977-12-06

1978-10-10

Robinson, Thomas A.

179 77, 179170NC, H04M 1900, H04B 158

Patent

active

041198069

ABSTRACT:
A subscriber's line equipment for a telephone exchange for replacing equipment comprising a telephone transformer or chopper, comprises a telphone line supply circuit comprised of two constant d.c. voltage sources, a transistor functioning as a constant current generator, a transformer connected to rectifying means, two transmitters connected to the primary winding of the transformer, a closed loop detecting circuit and receiving and transmitting circuits connected to receive and transmit signals to the telephone exchange.

REFERENCES:
patent: 4011410 (1977-03-01), Thomas

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