The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2009
Filed:
Nov. 21, 2005
Toshiaki Arikawa, Tokyo, JP;
Ryuuichi Ikematsu, Tokyo, JP;
Shigekazu Harada, Tokyo, JP;
Hajima Ishikawa, Tokyo, JP;
Takahide Sugita, Tokyo, JP;
Hidetoshi Shinoda, Tokyo, JP;
Toshiaki Arikawa, Tokyo, JP;
Ryuuichi Ikematsu, Tokyo, JP;
Shigekazu Harada, Tokyo, JP;
Hajima Ishikawa, Tokyo, JP;
Takahide Sugita, Tokyo, JP;
Hidetoshi Shinoda, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
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.