Succeeding in training in order the data communication system, the ADSL office device and ADSL joint mode choice manner and

摘要

PROBLEM TO BE SOLVED: To connect a modem by a connection mode optimized to the situation of a line in the case of connecting the modem corresponding to both of a G. dmt mode and a G. lite mode. ;SOLUTION: When an apparatus 1 in an ADSL station and an ADSL modem 2 are connected, a modem information transmission part 21, a modem information reception part 11, a modem discrimination part 12 and a connection mode selection part 15 mutually negotiates connection mode information supported by each of them to select an optima connection mode. When the connection mode is selected, training mode execution parts 16 and 22 actually try connection by the selected mode. When this training is successful, the connection of ADSL is completed.;COPYRIGHT: (C)2004,JPO