Trunk interface circuitry for telephone systems
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United States of America Patent
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Jan 16, 1990
Grant Date -
N/A
app pub date -
Jun 7, 1988
filing date -
Jun 7, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to improved trunk interface circuitry for telephone system common equipment, which is used to connect a local customer system to a central office of the telephone company. The improved trunk interface comprises an active two-terminal current sink for limiting the loop current in a non-linear manner, and means for monitoring the voltage across the trunk line which comprises a voltage-to-pulse width converter. The voltage-to-pulse width converter is designed to operate with a microprocessor which measures the time it takes to linearly discharge a capacitor which has been charged to the line voltage.
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