Central office line interface circuit for an analog network private telephone installation
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United States of America Patent
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Jun 23, 1992
Grant Date -
N/A
app pub date -
Jun 19, 1990
filing date -
Jun 19, 1989
priority date (Note) -
Expired
status (Latency Note)
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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).
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