Central office line interface circuit for an analog network priv

Details Central office line interface circuit for an analog network priv Central office line interface circuit for an analog network priv

1990-06-19

1992-06-23

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379345, 379402, 379331, H04M 1900

Patent

active

051250276

ABSTRACT:
Central office line interface circuit connecting a private telephone installation to a local central office. The central office line interface circuit includes a twin-loop line current polarity detector including a first optocoupler (57) for signalling polarity reversal, a transmission bridge (22) including a line loopback circuit operating via a second optocoupler (74) and provided with regulator and blocking means; it further comprises simplified tone and charging pulse detectors (24, 18).

REFERENCES:
patent: 3930127 (1975-12-01), Warren et al.
patent: 4369337 (1983-01-01), Parlor
patent: 4440979 (1984-04-01), McGibbon et al.
patent: 4563547 (1986-01-01), Booth
patent: 4856058 (1989-08-01), Sato et al.
patent: 4864609 (1989-09-01), Moisin
patent: 4866768 (1989-09-01), Sinberg
patent: 5014305 (1991-05-01), Moisin

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