Circuit for activating back-up lines

Details Circuit for activating back-up lines Circuit for activating back-up lines

1995-12-26

1998-02-17

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 22, 379 29, 379221, 379 1, 370223, H04M 129, H04M 308, H04M 322

Patent

active

057199175

ABSTRACT:
Disclosed is a circuit which permits automatic switching between a main line and spare line at a subscriber's network interface device. A relay is provided between the two lines, which relay is triggered by a ringing signal on the line to be used.

REFERENCES:
patent: 4594704 (1986-06-01), Ollivier
patent: 4807277 (1989-02-01), Perry
patent: 5001741 (1991-03-01), Sayer
patent: 5357556 (1994-10-01), Dresser
patent: 5524043 (1996-06-01), Debalko

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