An apparatus having n-number of working cross-connects for cross-connecting an n-bit input signals arriving from a plurality of input paths on a per-bit basis; n-number of first logic circuits for calculating the exclusive-ORs of each said n-bit and applying outputs to a standby cross-connect for providing...http://www.google.com.au/patents/US7103274?utm_source=gb-gplus-sharePatent US7103274 - Cross-connect apparatus
