Subscriber circuit provided with a circuit for monitoring a subs

Details Subscriber circuit provided with a circuit for monitoring a subs Subscriber circuit provided with a circuit for monitoring a subs

1994-06-15

1996-10-22

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379 32, 379377, 379385, 379413, H04M 322

Patent

active

055685471

ABSTRACT:
A subscriber circuit comprising a monitor circuit operating with a power supply voltage supplied to a subscriber instrument and monitoring an operation of the subscriber instrument for generating a monitor signal indicative of the result of monitor, and a power supply voltage abnormality detecting circuit receiving the power supply voltage supplied to the subscriber instrument, for generating an active abnormality detection signal when the power supply voltage deviates from a predetermined voltage range. In response to the active abnormality detection signal, the monitor circuit is inhibited from outputting the monitor signal

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patent: 5414386 (1995-05-01), Adachi et al.

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