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:
Apr. 17, 2007
Filed:
Sep. 20, 2004
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Shigeki Kitajima, Kawasaki, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Takashi Mori, Yokohama, JP;
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Shigeki Kitajima, Kawasaki, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Takashi Mori, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In an optical switching apparatus having redundantly-arranged optical switches, a route switching operation mode, an autonomic redundant switching operation mode and a compulsory redundant switching operation mode are discriminated from one another so that these operation modes are prevented from being executed at the same time, and also proper mask processing is performed at every switching operation mode. Therefore, emission of an undesired alarm and thus occurrence of malfunction when each switching operation is carried out can be prevented.