Patent ID: 8073135

Claim:
A method of detecting crosstalk relationships among a group of DSL lines, wherein the crosstalk is caused by one or more offender lines and further wherein the crosstalk is received as interference by one or more victim lines, the method comprising: identifying a suspected offender line set comprising a plurality of lines; instructing a first line in the suspected offender line set to use a line profile with at least a first transmit spectrum in at least one selected tone that is distinguishable from any transmit spectrum used by any other line in the suspected offender line set; instructing a second line in the suspected offender line set to use a line profile with at least a second transmit spectrum in at least one selected tone that is distinguishable from the first transmit spectrum and any transmit spectrum used by any other line in the suspected offender line set; determining a noise spectrum from operational data collected from a potential victim line set comprising a single DSL line or plurality of DSL lines; evaluating the noise spectrum to determine whether the potential victim line set is affected by crosstalk from the first or second line of the suspected offender line set; and identifying at least one line in the suspected offender line set as an offender line and at least one line in the potential victim line set as a victim line based on the evaluation.