There is provided a cross-connecting system capable of automatically detecting a connection error and a position where the connection error has occurred. The cross-connecting system has a cross-connecting apparatus which makes connection between a high-speed line and a low-speed line or between two high-speed...http://www.google.ca/patents/US5561766?utm_source=gb-gplus-sharePatent US5561766 - Cross-connecting system for making line connections between high-speed lines and low-speed lines and between high-speed lines and capable of detecting a line-connection error
