Electric cable e.g. telecommunication cable, testing method for e.g. telecommunication network, involves locating characteristic values of delay, and determining defect positions of cable based on values for each correlation

摘要

The method involves injecting pseudo random sequences of digital signals into injection points in a network, and obtaining composite signals created by the circulation of emitted sequences and their reflections in discontinuities of impedance of network. A correlation function representing a correlation value between a part of the composite signal and the sequences is calculated based on variable delay. Characteristic values of the delay are located, and defect positions of a cable are determined based on the values for each correlation, where the sequences are not correlated to each other. An independent claim is also included for a device for testing a cabling network, comprising two sources of pseudo-random sequences of digital signals.