Nec Corporation

Hajima Ishikawa

Shigekazu Harada

Takahide Sugita

Toshiaki Arikawa

Hidetoshi Shinoda

Ryuuichi Ikematsu

Disclosed are the multiplex communication system and the method therefore. A fault detection part of a duplex switching device detects it as generation of fault when recognizable signals are not detected from a connected line within a prescribed time. When the fault detection part detects the generation of fault in the present system line, the line switching part switches the lines from the present line to the standby line to perform communication between a terminal device and another terminal device therethrough. Also, the fault detection part notifies the generation of fault to the other duplex switching device after a prescribed switching protection time has passed from the time of the fault detected by the fault detection part, so the selection of the lines becomes consistent.

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Tokyo, Japan

Hajima Ishikawa