Importance

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Abstract

In a cross-connection network including first and second matrix switching units supplied with input digital signals through a branching circuit, first through N-th transmit switching circuits includes primary and secondary first through primary and secondary N-th transmit input terminals connected to primary and secondary first through primary and secondary N-th matrix output terminals of the first and the second matrix switching units, respectively, first through N-th transmit output terminals, and primary and secondary first through primary and secondary N-th abnormal signal detectors, respectively. The transmit switching circuits supply the input digital signals from the primary transmit input terminals to the transmit output terminals, respectively, when the secondary abnormal signal detectors detect abnormalities of the input digital signals, respectively. The transmit switching circuits supply the input digital signals from the secondary transmit input terminals to the transmit output terminals, respectively, when the primary abnormal signal detectors detect abnormalities of the input digital signals, respectively. The transmit switching circuits may supply the input digital signals from the primary transmit input terminals to the transmit output terminals, respectively, when secondary demand data detectors detect switch demand data of the input digital signals that represent failures of matrix switching circuits included in the matrix switching units, respectively. The transmit switching circuits may supply the input digital signals from the secondary transmit input terminals to the transmit output terminals, respectively, when primary switch demand data detectors detect the switch demand data, respectively.

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