Backup power supply at subscriber terminal

Details Backup power supply at subscriber terminal Backup power supply at subscriber terminal

1990-01-29

1991-01-08

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, H04M 1908

Patent

active

049842676

ABSTRACT:
An interconnecting apparatus for a subscriber premises which allows the DC battery providing sealing current to the tip and ring telephone lines serving the premises to be used as a backup battery for a subscriber terminal and which allows the supply serving the subscriber terminal to be used to charge the central office battery and provide sealing current when the latter battery is low.

REFERENCES:
patent: 4532382 (1985-07-01), Pommer
patent: 4547629 (1985-10-01), Corless
patent: 4560841 (1985-12-01), Pierrel
patent: 4634814 (1987-01-01), Pommer
patent: 4825349 (1989-04-01), Marcel
patent: 4847899 (1989-07-01), Hikida

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