CROSS-CONNECT DEVICE

摘要

A cross-connect device comprises n in-operation cross-connect units for cross-connecting input signals of n-bit structure arriving from input paths in units of a bit, n first logical circuits for operating the exclusive-OR of n bits of each input signal and inputting the outputs to an auxiliary cross-connect unit, n second logical circuits for operating the exclusive-OR of the outputs of the n in-operation cross-connect units and the auxiliary cross connect unit, and a third logical circuit having a selecting function of selecting either the output signals of the n in-operation cross-connect units or the output signals of the n second logical circuits. A failure, if occurs, of an in-operation cross-connect unit is detected by monitoring the outputs of the second logical circuits, and the failed in-operation cross connect unit is identified by sequentially turning off the n inputs into the second logical circuits one by one. The output signal of a second logical circuit is selected and outputted in place of the output signal of the failed cross-connect unit by the third logical circuit.