Patent ID: 7315571
Filing Date: 2008-01-01
Classification: H04L,H04M

Abstract:
1. An X-DSL transceiver configured to couple to at least one subscriber line to communicate at least one multi-tone modulated communication channel thereon; and the X-DSL transceiver comprising: a digital signal processor (DSP) configured to couple to the at least one subscriber line for multi-tone modulation and demodulation of the at least one communication channel thereon, and the DSP operative during a training phase of the at least one multi-tone modulated communication channel to determine an available range of frequencies on the at least one subscriber line and to expand or contract a tone spacing of each of a fixed number “N” of tones responsive to the determination; and the DSP including: at least one analog front end (AFE) coupled between the at least one subscriber line and the DSP and the at least one AFE configured to perform analog-to-digital and digital-to-analog conversion of the at least one multi-tone modulated communication channel at rates compatible with the processing interval of the Fourier transform module; whereby the range of frequencies spanned on the subscriber line between a lowest frequency one and a highest frequency one of the fixed number “N” of modulated tones of the at least one communication channel includes either a first range of frequencies associated with expanded spacing of each of the “N” tones and generally associated with a short subscriber line or a second, relatively narrower, range of frequencies associated with contracted spacing of each of the “N” tones and generally associated with a relatively long subscriber line.