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Detecting faults in transmission lines employing an echo cancellation signal

  • US 4,859,951 A
  • Filed: 10/21/1987
  • Issued: 08/22/1989
  • Est. Priority Date: 10/22/1986
  • Status: Expired due to Fees
First Claim
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1. Fault detection apparatus for detecting faults in transmission lines comprising:

  • transmitter means for supplying a sequence of output pulses to a wire,receiver means for receiving echoes of said pulses from said wire using a sample clock rate of 1/T and an adaptive cancellation processor arranged to produce a cancellation signal in response to each output pulse,said apparatus further including a fault detection processor,said fault detection processor being arranged to receive N sets of cancellation coefficients from said cancellation processor, each of said sets of cancellation coefficients being derived by adjusting the sample clock phase of the receiver means and hence of the cancellation signal by T/N,said fault detection processor interleaving said N sets of coefficients to derive an overall coefficient set representing line characteristics at N times sample rate 1/T,said overall set of coefficients being compared with a stored reference set to determine whether a fault has occurred on the line.

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