Patent ID: 8559547

Claim:
A method of controlling crosstalk between an activating channel associated with a first network terminal of a communication system and a plurality of active channels associated with respective other network terminals of the communication system, the method being implemented in an access node of the communication system, the method comprising the steps of: detecting a control signal sent by the first network terminal over the activating channel in a designated phase of an initialization process of the first network terminal where the control signal sent by the first network terminal comprises a value that is selected by the first network terminal from a set of two or more values and prior to said detecting the particular selected value is unknown to the access node; determining an error signal from the detected control signal; correlating the error signal with one or more corresponding signals sent by respective ones of the other network terminals over the active channels; estimating crosstalk from one or more of the active channels into the activating channel based on the correlation; and configuring a vectoring signal processing module of the access node to control the estimated crosstalk.