Backup battery power supply for microprocessor based telephones

Details Backup battery power supply for microprocessor based telephones Backup battery power supply for microprocessor based telephones

1985-02-04

1987-03-03

Shoop, Jr., William M.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

307 66, 307 64, 379387, H02J 906

Patent

active

046477870

ABSTRACT:
A circuit arrangement for use in telephone instruments which require battery backup for memory retention and microprocessor operation during such procedures as pulse dial address signalling where no power can be supplied by the telephone subscriber's line. Bipolar solid state circuitry may be used to provide the necessary backup power supply during these periods.

REFERENCES:
patent: 3614334 (1971-10-01), Bonvallet
patent: 3686444 (1972-08-01), Stevenson
patent: 4064366 (1977-12-01), Wheatley et al.
patent: 4327298 (1982-04-01), Burgin
patent: 4532382 (1985-07-01), Pommer, II
patent: 4547629 (1985-10-01), Corless

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