Integrated ringer for short telephone lines

Details Integrated ringer for short telephone lines Integrated ringer for short telephone lines

1997-12-02

2000-02-15

Isen, Forester W.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379382, 379398, 379399, H04M 1100

Patent

active

060261595

ABSTRACT:
The invention provides an apparatus for use with a subscriber line interface circuit in a telephone system, the subscriber line interface circuit being interposed between a telephone central office and a subscriber line, the subscriber line being coupled with a subscriber telephone device. The apparatus comprises an interface circuit for coupling the apparatus with the subscriber line; a ringing generator coupled with the interface circuit for providing a time varying signal to the subscriber line in response to a received ring signal; a detector circuit coupled with the interface circuit for detecting an impedance of the subscriber line in the presence of the time varying signal and providing a detect indication when the impedance is below a predetermined impedance threshold; and a control circuit coupled with the ringing generator and with the detector circuit for providing the ring signal to the ringing generator and receiving the detect indication from the detector circuit, the control circuit interrupting the ring signal in response to receiving the detect indication. The apparatus provides balanced ringing signals to the subscriber telephone device and detects loop AC impedance to provide ring trip detection.

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