Variable DC feed characteristic in a subscriber line interface c

Details Variable DC feed characteristic in a subscriber line interface c Variable DC feed characteristic in a subscriber line interface c

1994-10-31

1997-04-08

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379377, 379399, H04M 100, H04M 1900

Patent

active

056195672

ABSTRACT:
A telephone subscriber line interface circuit includes off-hook detection circuitry, a plurality of current or voltage sources, and a switch responsive to the off-hook detection circuitry to add and subtract currents or voltages. The interface circuit thereby tailors a feed characteristic in an on-hook and an off-hook condition of the telephone.

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patent: 5347577 (1994-09-01), Takato et al.
patent: 5511118 (1996-04-01), Gores et al.

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