Patent ID: 7088783

Claim:
A digital subscriber line communicating method which performs data communication by utilizing a telephone line as a high-speed data communication line, comprising the steps of; transmitting DMT symbols through said telephone line under a TCM-ISDN cross-talk environment, one period of said TCM-ISDN being different from integral multiples of said DMT symbols; and conducting signal-to-noise ratio (S/N) measurements in which, during training for communication, said transmitted DMT symbols received partially but not completely inside of a near end cross talk (NEXT) duration or a far end cross talk (FEXT) duration at a receiving side are not used to measure the S/N, only said transmitted DMT symbols received inside of the NEXT duration are used to measure the NEXT duration S/N, and only said transmitted DMT symbols received inside of the FEXT duration are used to measure the FEXT duration S/N.