A multi-stage, alternate routing switching network is enhanced with aswitch architecture that is able to detect and mask all single faults. The switchemploys a controller that develops dual rail control signals. In one embodiment, thecontroller is made up of two controllers that receive the same inputs but generatecomplementary outputs. The complementary outputs form the dual rail signals thatcontrol the multiplexers that are interposed between the inputs and the outputs of theswitch. The dual rail control of the signal routing within the switch allow foreffective detection of all single faults in the signal routing means. Inclusion oftotally self checking circuits at the switch outputs as well as inputs enables users toreadily isolate a fault and identify its source.
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