Method and means for powering telephone span lines
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United States of America Patent
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-
Apr 1, 1980
Grant Date -
N/A
app pub date -
Jan 3, 1978
filing date -
Jan 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An essentially non-dissipative, strap-free, continuously adjustable power unit inherently impervious to shorts and open circuits for powering repeaters in a T1 or similar telephone span line is disclosed. The unit uses a pulse-width modulated inverter in the converter input circuit to produce a variable-voltage D.C. output to the span line. The pulse width or duty cycle of the inverter is controlled by a control logic which senses the span line current and maintains it at a selectable predetermined level without any apreciable power dissipation.
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