Electrical power and telephone ringer signal distribution system

Details Electrical power and telephone ringer signal distribution system Electrical power and telephone ringer signal distribution system

1996-05-28

1997-10-28

Matar, Ahmad F.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379322, 379324, 379334, H04M 1902

Patent

active

056824238

ABSTRACT:
A telephony system includes a plurality of local network terminations connected to a street cabinet in turn connected to an exchange. The street cabinet has a power supply for supplying voltage, a clock for generating a master ringer signal, and a modulator for modulating the voltage with the ringer signal. The filters extract the DC voltage and the ringer signal. The extracted DC voltage and the extracted ringer signal obviate the prior art requirements to provide a separate DC power supply and a separate clock within each local network termination, thereby avoiding duplication of components within each local network termination.

REFERENCES:
patent: 3778555 (1973-12-01), Nordling et al.
patent: 3917908 (1975-11-01), Galluccio
patent: 4230913 (1980-10-01), Brothers et al.
patent: 4310728 (1982-01-01), Dumont
patent: 4984267 (1991-01-01), Martinez

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