Method and device for crosstalk evaluation and communication system comprising such device

#The invention relates to a method and to a device for crosstalk evaluation and to a communication system comprising such a device.

#DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network.

#Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voice band modem can provide. Such fast transmission is achieved by utilizing frequencies that are normally not used by a voice telephone call, in particular, frequencies higher than normal human hearing.

#FIG. 1 shows a multiple-input-multiple-output (MIMO) system modeling near end crosstalk (NEXT) and far end crosstalk (FEXT);

#FIG. 2 shows a graph comprising a central office (CO) with several ports (CO1, CO2, . . . , COn) that are connected to a customer-premises equipment (CPE1, CPE2, . . . , CPEn) each;

#FIG. 3 shows a flowchart comprising steps of a method to evaluate crosstalk and the perform single ended line testing via such crosstalk interference identified;

#FIG. 1 shows a multiple-input-multiple-output (MIMO) system modeling near end crosstalk (NEXT) and far end crosstalk (FEXT). The Loop Plant Model LPM represents the complete channel structure including (but not limited to) a main distribution frame, optional branching devices and crosstalk interferences of various kind.

#Advantageously, such Loop Plant Model LPM can be used to model upstream (from a customer-premises equipment CPE to a central office CO) and downstream (traffic from the CO towards the CPE) traffic via separate ports.

#Further, the Loop Plant Model LPM comprises a matrix of pulse responses comprising pulse responses of the transmission lines in its diagonal and crosstalk interference outside of the matrix′ diagonal: