Line interface circuit

Details Line interface circuit Line interface circuit

1989-06-01

1990-05-01

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379402, 379405, H04B 303

Patent

active

049225316

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 telephone facility to the telephone line. A secondary winding in combination with the tip and ring windings couples a.c. signals between the facility. A capacitance is connected in combination with the secondary winding to simulate a function of a capacitance as would normally be connected between the tip and ring windings in prior art circuits, but without the problem of feed resistor interference at lower voice band frequencies. Network and component values are inserted between the secondary winding and an electronic hybrid circuit whereby the line circuit is precisely tailored for anyone of several national telephone line standards.

REFERENCES:
patent: 4197431 (1980-04-01), Vis
patent: 4415777 (1983-11-01), Agnew
patent: 4600811 (1986-07-01), Hayashi et al.
patent: 4829567 (1989-05-01), Moison

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