Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reissue Patent
2006-11-21
2006-11-21
Matar, Ahmad F. (Department: 2642)
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
C379S377000, C379S382000, C379S372000, C379S373010, C379S387010, C379S399010, C379S412000, C379S413010, C379S413020, C379S442000, C379S443000, C379S418000, C379S252000, C379S163000
Reissue Patent
active
RE039406
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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Buchanan & Ingersoll PC
Hershkovitz Shmuel
Matar Ahmad F.
Nguyen Quynh H.
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