Technique for reconnecting office line to key telephone system a

Details Technique for reconnecting office line to key telephone system a Technique for reconnecting office line to key telephone system a

1996-11-07

1999-06-15

Kuntz, Curtis A.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379 37, 379156, 379166, 379322, 379377, H04M 100

Patent

active

059129573

ABSTRACT:
A power failure shunting office line restoring circuit includes: a first relay having an office line tip port connected to a common port for connecting the tip port of the office line to a separate emergency telephone or a key telephone office line accommodating circuit in accordance with a first relay control signal; a second relay having an office line ring port connected to a common port for connecting the ring port of the office line to the emergency telephone or the key telephone office line accommodating circuit in accordance with a second relay control signal; a controller for generating the first and second relay control signals according to a power supply state or emergency telephone use state detection signal; first and second relay drivers for driving the first and second relays in accordance with the first and second relay control signals generated by the controller, and a detector connected to the first relay for detecting the use of the emergency telephone and for outputting the use state detection signal to the controller.

REFERENCES:
patent: 4100375 (1978-07-01), Noller
patent: 4392024 (1983-07-01), Shinoi et al.
patent: 4575584 (1986-03-01), Smith et al.
patent: 4972452 (1990-11-01), Chack et al.
patent: 5142571 (1992-08-01), Suzuki et al.
patent: 5200990 (1993-04-01), Cho
patent: 5220597 (1993-06-01), Horiuchi
patent: 5483574 (1996-01-01), Yuyama
patent: 5581612 (1996-12-01), Nishikawa

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