Battery switching in a telephone subscriber line interface circu

Details Battery switching in a telephone subscriber line interface circu Battery switching in a telephone subscriber line interface circu

1994-12-29

1998-04-07

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, 379398, 379399, 429 9, H04M 1900

Patent

active

057374112

ABSTRACT:
A telephone subscriber line interface circuit includes a first circuit portion and a second circuit portion, a first battery voltage and a second battery input for receiving a second battery voltage. The second circuit portion is coupled to the second battery input. The telephone subscriber line interface circuit further includes a switch for coupling the first circuit portion to one of the first battery input and the second battery input.

REFERENCES:
patent: 4613797 (1986-09-01), Eggers et al.
patent: 5138658 (1992-08-01), Carter et al.
patent: 5175764 (1992-12-01), Patel et al.
patent: 5428682 (1995-06-01), Apfel

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