Wireline communication system and method of frequency allocation therein

Abstract

To alleviate the requirement to back-off all up-link performance, such as by limiting power spectral density, to overcome far-end cross-talk problems otherwise associated with relatively short loop-length wireline links, the present invention partitions the frequency spectrum based on an estimate of the loop length of a subscriber unit (CPE) modem from an exchange (LTE) modem. Up to a threshold frequency (f ) at which received transmissions from a subscriber having a longest loop length ( ) become indistinguishable by the LTE modem from a noise floor ( ), up-link performance on all loop lengths is limited to correspond to that of the longest loop. At frequencies above the threshold frequency (f ), subsets of subscribers ( ) having relatively short loop lengths ( ) use high frequency carriers that have signal to noise ratios sufficient to support information transmission in these elevated frequency bands.