Architecture for minimum loop current during ringing and caller ID
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United States of America Patent
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Dec 13, 2005
Grant Date -
Nov 6, 2003
app pub date -
May 5, 2003
filing date -
Apr 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmission of power across the isolation barrier rather than being powered from the phone line. Thus, loop current need not be drawn from the TIP/RING lines during ringer bursts. The isolation barrier may be a capacitive isolation barrier which allows bidirectional communication and extraction of power from signals transmitted across the barrier.
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