초록 ▼

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 r

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.

대표청구항 ▼

[ I claim:] [1.] A circuit comprising:means for receiving a first logic signal from a first conductor which is connectable to an alternate, essentially identical circuit;means for returning the same first logic signal to the first conductor so that the signal remains on the first conductor when the

[ I claim:] [1.] A circuit comprising:means for receiving a first logic signal from a first conductor which is connectable to an alternate, essentially identical circuit;means for returning the same first logic signal to the first conductor so that the signal remains on the first conductor when the alternate circuit is disconnected from the first conductor;means for detecting a second signal from a second conductor which is also connectable to the alternate circuit; andmeans for applying the same second signal to the second conductor when the alternate circuit is reconnected to the second conductor after having been disconnected from the second conductor.