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:
Dec. 15, 2009
Filed:
Apr. 20, 2007
Yasuki Fujii, Kawasaki, JP;
Keiji Miyazaki, Kawasaki, JP;
Shinya Kano, Kawasaki, JP;
Akira Nagata, Kawasaki, JP;
Yasuki Fujii, Kawasaki, JP;
Keiji Miyazaki, Kawasaki, JP;
Shinya Kano, Kawasaki, JP;
Akira Nagata, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A node in a first ring stores therein connection information about connecting nodes between a second ring and a third ring. Upon receiving a route of a working path by a signaling, the node determines any one of nodes composing the second ring as a branch node. If the working path is not terminated on an end node that the working path ends in the second ring thereon, and also if no node composing the second ring stores therein connection information between the end node and any one of the connecting nodes in the third ring that is connected to the second ring, the node compares each condition of selectable routes of a backup path between the end node and the branch node, and selects any one of the selectable routes as the backup path based on a result of comparison.