Patent ID: 6944216
Filing Date: 2005-09-13
Classification: H04B,H04L,H04M,H04Q

Abstract:
1. A digital subscriber line communicating system for communicating between a transmitting side and a receiving side through a communication line, comprising: a sliding window generating unit for generating a sliding window based on a timing signal representing a periodical noise duration; and a sliding window transmitting unit for transmitting a modulated symbol according to said sliding window through said communication line to said receiving side; wherein said transmitting side is a central office and said receiving side is a remote terminal; said central office comprising: a timing signal generating unit for generating said timing signal synchronized with a transmission system which interfaces said central office and said remote terminal; said sliding window generating unit being operatively connected to said timing signal generating unit, and said sliding window being a downstream sliding window indicating the phase of a noise condition of said remote terminal; and said sliding window transmitting unit transmitting modulated symbols according to said downstream sliding window through said communication line to said remote terminal; and said remote terminal comprising: a sliding window receiving unit for receiving modulated symbols according to said downstream sliding window from said central office; said downstream sliding window indicating cross-talk durations due to TCM ISDN transmission at the remote terminal; wherein a first cross-talk duration is within a prior half of each cycle of said timing signal, and a second cross talk determined with a near end cross-talk duration at the remote terminal, is within a latter half of each cycle of said timing signal, an inside of said downstream sliding window being formed within said first cross-talk duration; and wherein, during timing recover training between said central office and said remote terminal, an inside symbol of said downstream sliding window is formed by a first kind of signal, and an outside symbol of said downstream sliding window is formed by a second kind of signal, said first kind of signal and said second kind of signal being obtained by modulating a carrier signal but being different in phase by a predetermined angle.