Line interface circuit

Details Line interface circuit Line interface circuit

1990-05-31

1991-05-07

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379399, 379413, H04B 158

Patent

active

050143050

ABSTRACT:
A telephone line interface circuit includes a transformer with tip and ring windings connected between tip and ring feed resistors and tip and ring leads of a telephone line, for feeding energizing current from a telephone facility to the telephone line. A secondary winding in combination with the tip and ring windings couples a.c. signals between the facility and the telephone line. A capacitance device is connected in combination with the secondary winding to simulate a function of a capacitance device as would normally be connected between the tip and ring windings in prior art circuits. The telephone line interface circuit is particularly useful in association with battery reversal responsive telemetry devices as any tendency for false ringer activation, in a connected telephone set, is reduced.

REFERENCES:
patent: 3300558 (1967-01-01), Flowers
patent: 4087647 (1978-05-01), Embree et al.
patent: 4103112 (1978-07-01), Korsky
patent: 4358643 (1982-11-01), Levy
patent: 4380690 (1983-04-01), Matsufuji et al.
patent: 4500755 (1985-02-01), Murto
patent: 4864608 (1989-09-01), Moisin

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