Circuit for switching between ring signal and message waiting si

Details Circuit for switching between ring signal and message waiting si Circuit for switching between ring signal and message waiting si

1984-03-30

1985-08-06

Rubinson, Gene Z.

179 18BG, H04M 342

Patent

active

045337926

ABSTRACT:
The invention relates to a circuit for switching between a ring signal and a message waiting signal in a telephone system, such as a PBX, without the occurrence of "bell tap". The instantaneous value of the ring signal is compared with a D-C value of the message waiting signal to generate a smooth transition between the ring and message waiting states of the composite RAC/MW signal. The circuit selectively suppresses the controlling edge of the ring synchronous signal whenever a particular subscriber station would be connected to the RAC/MW signal at an inappropriate time. Accordingly, the problem of "bell tap" is eliminated.

REFERENCES:
patent: 3826876 (1974-07-01), Gueldenpfenning et al.
patent: 3919492 (1975-11-01), Borland
patent: 4266101 (1981-05-01), Dunbar

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