A method and system for performing sequence time domain reflectometry over a communication channel to determine the location of line anomalies in the communication channel is disclosed. In one embodiment, the system generates a sequence signal and transmits the sequence signal over an optical channel....http://www.google.com.tw/patents/US20040019443?utm_source=gb-gplus-share專利 US20040019443 - Sequence time domain reflectometry using complementary golay codes
