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. 08, 2008
Filed:
Jul. 28, 2005
Shigeki Kitajima, Kawasaki, JP;
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Shigeki Kitajima, Kawasaki, JP;
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical communication network system is disclosed, which includes an optical switching apparatus. The optical switching apparatus includes an optical switch for switching and setting routes of an optical signal without being converted, a control unit for instructing the optical switch to execute a route switching operation, and a performance monitor for detecting performance of the optical signal having a route set by the optical switch. The performance monitor issues an alarm when the performance detected is deteriorated from predetermined performance. The control unit includes an alarm masking unit for masking the alarm issued from the performance monitor at least for a predetermined masking period from a starting time of a switching operation by the optical switch, and thus preventing the alarm from being issued.