Power fail monitor and transfer circuit

Details Power fail monitor and transfer circuit Power fail monitor and transfer circuit

1975-12-22

1976-10-12

Olms, Douglas W.

179 27G, 1791753S, H04M 342

Patent

active

039859746

ABSTRACT:
Generally, the power fail monitor and transfer circuit of the present invention provides four metallic transmission loops from the subscribers on the private branch exchange to four dedicated trunk lines to the central office. The central office battery is utilized as the transmission media and, on incoming calls, the central office extends ringing current directly to the private branch exchange subscribers. The metallic transmission loops are automatically provided during a failure, and, during power restoration, any interruption of existing telephone conversations is effectively prevented by monitoring the current flow in the transmission path, by means of optical couplers.

REFERENCES:
patent: 3506789 (1970-04-01), Brockschmidt et al.
patent: 3854012 (1974-12-01), Chambers
patent: 3927272 (1975-12-01), Bloxham et al.

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