Method of tagging signals used for leakage detection and measurement in xDSL data transmission networks and apparatus for detection and/or measurement of leakage sources tagged with this method

摘要

A method of tagging signals for leakage detection and measurement in xDSL data transmission networks which uses additional signals carrying the tagging information and transmitted in these networks. A narrowband tagging signal or signals are placed in the unused parts of an xDSL signal frequency spectrum or in its proximity.