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

1977-11-16

1979-01-09

Robinson, Thomas A.

179 18FA, H04B 158

Patent

active

041339860

ABSTRACT:
A subscriber's telephone line equipment for connection to a telephone exchange for replacing a telephone transformer or other kind of transformer. The equipment comprises a circuit connected to the telephone line which comprises two voltage sources, a chopper circuit, a voltage-doubling rectifier, a current-limiting circuit and a closed-loop detecting circuit, and receiving and transmitting circuits connected to said telephone exchange.

REFERENCES:
patent: 4039766 (1977-08-01), Picandet

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