Detecting faults in transmission lines employing an echo cancell

Details Detecting faults in transmission lines employing an echo cancell Detecting faults in transmission lines employing an echo cancell

1987-10-21

1989-08-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

379 26, G01R 3111

Patent

active

048599514

ABSTRACT:
A variation in the cancellation coefficents of an echo cancelling modem indicate a change in the impedance of a line. In an echo canceller with T spaced samples (i.e. producing a cancellation signal at the data rate) the resolution is too poor to provide satisfactory identification of faults. A set of coefficients is stored and the sampling phase adjusted to produce a second set. This may be repeated producing eight sets in the preferred embodiment. A higher resolution picture of the line impedance is built up allowing comparisons with an earlier or optimum set of values. The test facility may be included in an operating modem providing line test facilities when not transmitting data.

REFERENCES:
patent: 4064379 (1977-12-01), Horna
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4649335 (1987-03-01), Lassaux et al.
Patent Abstracts of Japan, vol. 6, No. 75, (P-114)[053], 12th May 1982; & JP-A-57, 12 493 (Kokusai Denki).

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