System and method for eliminating bell tap on analog telephones

Details System and method for eliminating bell tap on analog telephones System and method for eliminating bell tap on analog telephones

1993-05-10

1997-02-11

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379252, 379377, 379396, 379418, H04M 100, H04M 300, H04M 900

Patent

active

056029110

ABSTRACT:
A system and method for modifying a composite Ring AC/Message Waiting (RAC/MW) signal to prevent bell tap on analog telephones. The composite RAC/MW signal comprises AC signals and DC signal alternately spaced in time. At a zero crossover point the composite RAC/MW signal is ramped from a given bias voltage level to a desired Message Waiting voltage level at a slope sufficient to prevent bell tap. Near the end of the Message Waiting portion of the composite signal the composite signal is ramped to the bias voltage level at a slope sufficient to prevent bell tap.

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patent: 4823379 (1989-04-01), Palmer
patent: 4969186 (1990-11-01), Sayre, II
patent: 4975949 (1990-12-01), Wimsatt et al.

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