Telephone line interface circuit

Details Telephone line interface circuit Telephone line interface circuit

1988-05-26

1989-09-05

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 1900

Patent

active

048646091

ABSTRACT:
A telephone line circuit transformer couples tip and ring leads of a telephone line to a telephone facility. Tip and ring transformer windings are connected in series with the respective tip and ring leads, tip and rings feed resistors and terminals of a battery power source for supplying energizing current to the telephone line. A capacitor is connected between a junction of the tip winding and the tip feed resistor and a junction of the ring winding and the ring feed resistor. A compensating circuit is connected to drive a compensating winding in current opposing relationship with respect to differential alternating current signals in the tip and ring windings and being within a range of voice frequencies within which an impedance of the capacitor is significantly shunted by the feed resistors.

REFERENCES:
patent: 4607142 (1986-08-01), Martin

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