DIGITAL SUBSCRIBER LINE TRANSMISSION METHOD, xDSL APPARATUS AND xDSL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a digital subscriber line transmission system capable of countermeasuring TCM crosstalk by revising part of software for hardware adopting the standard system without causing much variation in the standard system. SOLUTION: In the digital subscriber line transmission method for performing training for communication by using a DMT (Discrete Multiple Tone) symbol and a telephone line for a high speed data communication line, a symbol whose 4-value QAM signal point differs from that of a phase of TCM 400 Hz used for a symbol notified to an opposite party is transmitted. COPYRIGHT: (C)2004,JPO