Telephone line coupler

Details Telephone line coupler Telephone line coupler

1995-11-08

1998-05-12

Chiang, Jack

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379373, 379399, 379412, H04M 100

Patent

active

057518033

ABSTRACT:
The telephone line coupler circuit has a single transmit opto-coupler whose output includes a DC bias component connected to a gate of a line seize switch for connecting a DC line seize load across the ring and tip contacts of the telephone line. The line seize switch is saturated by the transmit opto-coupler bias output and the AC component of the transmit opto-coupler output is sent over the telephone lines. The receive opto-coupler is used both for receiving communications signal and for detecting the ring signal. The band pass filter connected to the output of the receive opto-coupler may be switched to pass a ring signal frequency band or a communications frequency band. The circuit operates using two opto-coupler devices while conventional circuits require four opto-coupler devices.

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