Power fail monitor and transfer circuit for private branch...

Details Power fail monitor and transfer circuit for private branch... Power fail monitor and transfer circuit for private branch...

H - Electricity

04

M

379/63, 379/66

H04M 19/00 (2006.01) H04M 7/00 (2006.01) H04Q 1/28 (2006.01)

Patent

CA 1056527

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 median 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.

262279

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