Patent ID: 8817857

Claim:
A method for performing upstream power back-off (UPBO) for a first digital subscriber line (DSL) line in a vectored DSL system comprising a vectored group of DSL lines comprising the first DSL line and a plurality of other DSL lines, wherein each vectored group DSL line comprises a customer premises equipment (CPE) modem coupled to a digital subscriber line access multiplexer (DSLAM) via a DSL line, the method comprising: identifying a partial far-end crosstalk (FEXT) cancellation scheme used in the vectored DSL system, wherein the partial cancellation scheme defines performing partial FEXT cancellation on upstream transmissions of the first DSL line, wherein performing partial FEXT cancellation on upstream transmissions of the first DSL line results in residual crosstalk remaining in received signals after partial cancellation has been performed, wherein the partial FEXT cancellation scheme includes: selecting a subset consisting of less than one or more of all possible disturbers, tones, channels and lines, and performing FEXT cancellation for only the selected subset; determining an effect of the residual crosstalk on the received signals associated with the partial FEXT cancellation scheme; calculating first DSL line partial cancellation UPBO parameters based on the determined effect of the residual crosstalk and one or more selected performance metrics, wherein the one or more performance metrics relate to transmissions by the first DSL line, wherein each one of the one or more performance metric is one of the following: a measured performance metric, a simulated performance metric, and an estimated performance metric; and operating the vectored group as a vectored DSL system using the calculated first DSL line partial cancellation UPBO parameters.