Communications interface providing isolation and ringdown featur

Details Communications interface providing isolation and ringdown featur Communications interface providing isolation and ringdown featur

1996-05-31

1998-09-29

Matar, Ahmad F.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379379, 379393, 379413, 363 16, H04M 322

Patent

active

058155678

ABSTRACT:
A communications interface having an isolation circuit for signals from a plain old telephone set (POTS) device to communications electronics. The communications interface having an isolated power supply. The isolated power supply including a flyback transformer for a current loop supply and an isolated power source The telephone line isolation circuit having an optically isolated off-hook detection circuit and an isolation transformer for isolating communication electronics from the telephone current loop. The telephone line isolation circuit providing a ringing circuit for ringing a current loop device, such as a standard plain old telephone system (POTS) device.

REFERENCES:
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4754385 (1988-06-01), McDade et al.
patent: 4907261 (1990-03-01), Chapman
patent: 5216704 (1993-06-01), Williams et al.
patent: 5515423 (1996-05-01), Beck et al.
patent: 5600715 (1997-02-01), Bingel
patent: 5615225 (1997-03-01), Foster et al.

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