Circuit pack sparing arrangement

Details Circuit pack sparing arrangement Circuit pack sparing arrangement

1996-05-29

1999-09-28

Patel, Ajit

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

370217, H04J 116, H04J 314

Patent

active

059599707

ABSTRACT:
The invention is a circuit which permits spare circuit packs to replace operational circuit packs while keeping peripheral circuitry apprised of the status of the packs. The circuit receives signals from a first conductor and returns the signals to the conductor so that a spare circuit pack can be removed without affecting the signals to the peripheral circuits. The circuit also detects the signals on a second conductor and applies the same signals when a circuit pack including the circuit is reconnected. The circuit also includes elements which prevent loading down the conductors while power from the circuit is cut off or during power up.

REFERENCES:
patent: 4819225 (1989-04-01), Hochstein
patent: 4821256 (1989-04-01), Schmidt et al.
patent: 4947385 (1990-08-01), Rau
patent: 5612946 (1997-03-01), Kanekawa et al.

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