Trunk interface circuitry for telephone systems

Details Trunk interface circuitry for telephone systems Trunk interface circuitry for telephone systems

1988-06-07

1990-01-16

Brown, Thomas W.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379234, 379398, H04M 322, H04M 714

Patent

active

048948608

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.

REFERENCES:
patent: 3838224 (1974-09-01), Richards
patent: 4563547 (1986-01-01), Booth
patent: 4776007 (1988-10-01), Styrna et al.

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