Power supply system including ringing voltage reset under low in

Details Power supply system including ringing voltage reset under low in Power supply system including ringing voltage reset under low in

1994-09-21

1996-07-23

Chin, Stephen

Telephonic communications

Supervisory or control line signaling

Substation originated

379 1, 379412, 379413, H04M 124, H04M 100, H04M 960, H04M 908

Patent

active

055398057

ABSTRACT:
A voltage detection circuit, in conjunction with a power supply system for ringing voltage generation in a remote telecommunications unit, monitors the operating voltage level of the remote unit and, when an undervoltage condition is detected, causes a ringing reference-signal generator to collapse the reference (AC) sine wave into a fixed (DC) state and holds it in this state for a preselected time, thereby substantially reducing the ringing-signal current load and allowing the operating voltage level to restore. The features of the invention allow for continued processing of calls in progress and for incoming call completion during an undervoltage condition. The increased reliability and integrity of the power supply system allows for extended power supply feeder distance to the remote telecommunications unit.

REFERENCES:
patent: 4718079 (1988-01-01), Resito
patent: 5247583 (1993-09-01), Reichelt
patent: 5260996 (1993-11-01), Dillon et al.
patent: 5321596 (1994-06-01), Hurst

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