Current limited subscriber interface circuit

Details Current limited subscriber interface circuit Current limited subscriber interface circuit

1992-05-05

1994-05-24

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, 379399, 379401, H04M 1900

Patent

active

053156536

ABSTRACT:
An electronic interface circuit between a telephone subscriber line and a telephone main exchange is disclosed which forms, with the main exchange battery, a supply bridge for the telephone line, with limitation of the line current to a predetermined threshold value. The voltage/current characteristic of the supply bridge is balanced for lower values of the line current than the threshold current and is unbalanced whenever the line current attains said threshold current.

REFERENCES:
patent: 4485341 (1984-11-01), Welty et al.
patent: 4841565 (1989-06-01), Siligoni et al.

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