Patent ID: 7529176

Claim:
A method for determining a transmit power spectral density to be applied at a remote location over at least one line connecting said remote location to at least a first customer location, by using a power control unit including a computing portion, a measurement portion, and an estimating portion, said method comprising: modeling, by the computing portion, a first far-end crosstalk originating from said at least one line and coupling into a victim neighboring line as a first modeled far-end crosstalk, said victim neighboring line connecting a central location through said remote location to a second neighboring customer location, modeling, by the computing portion, a second far-end crosstalk originating from at least one additional neighboring line and coupling into said victim neighboring line as a second modeled far-end crosstalk, said additional neighboring line connecting said central location through said remote location to at least a third neighboring customer location, determining, by the computing portion, by using a mathematical derivation, said transmit power spectral density from said first modeled far-end crosstalk and said second modeled far-end crosstalk, expressing, by the computing portion, as part of said mathematical derivation, said transmit power spectral density as a function of a line parameter said line parameter characterizing a line segment of said additional neighboring line spanning from said central location to said remote location; carrying out, by the measurement portion, channel measurements of a spare line that connects said central location to said remote location, said spare line and said line segment share common transmission characteristics, estimating, by the estimation portion, from said channel measurements a value of said line parameter, and determining, by the computing portion, said transmit power spectral density from said value of said line parameter.