Fujitsu Corporation

Kumiko Maruo

Takashi Sasaki

Masato Hori

Akira Oshima

Yasuhiro Arai

Yoichi Ueda

Noriyasu Suzuki

An xDSL transceiver comprising a transmission unit for transmitting a DMT-modulated signal through a subscriber line as a transmission path and a receiving unit for receiving the DMT-modulated signal from the subscriber line. The xDSL transceiver further comprises an echo signal suppression unit for suppressing the echo signal from the transmission unit to the receiving unit by matching the phase between the frame of the transmission signal and the frame of the receiving signal.

xDSL transceiver

An ADSL modem connected to the telephone line is disclosed, which even in the case where a plurality of ADSL modems are connected to a single telephone line installed in a SOHO application or in the home of an ordinary user, a stable high-speed data communication can be realized without superposing the signals between the ADSL models or without causing any impedance mismatch. An ADSL band signal detector ( ) detects whether the ADSL frequency band is occupied by another ADSL modem connected to the telephone line or not. Upon detection that the ADSL frequency is so occupied, a control unit ( ) suppresses the application of the signal energy to the ADSL frequency band.

ADSL modem

Growing community of inventors

Kawasaki, Japan

Kumiko Maruo