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:
Feb. 19, 2008
Filed:
Mar. 05, 2003
Naoaki Yamanaka, Tokyo, JP;
Eiji Oki, Tokyo, JP;
Kohei Shiomoto, Iruma, JP;
Satoru Okamoto, Yokohama, JP;
Wataru Imajuku, Yokohama, JP;
Naoaki Yamanaka, Tokyo, JP;
Eiji Oki, Tokyo, JP;
Kohei Shiomoto, Iruma, JP;
Satoru Okamoto, Yokohama, JP;
Wataru Imajuku, Yokohama, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An upper layer node is used in a multi-layer network which includes an upper layer network which performs switching and transfer in units of packets, and a lower layer network which includes optical transmission lines and optical switches and accommodate the upper layer network; this upper layer node being connected to the lower layer network which includes lower layer nodes including obstruction restoration sections, and transmission lines, and including: a section which detects the occurrence of an obstruction upon a transmission line which it accommodates; a section which advertises the detection result as obstruction information; a section which retains the topology information for the network; a section which updates the retained topology information according to advertised obstruction information, or obstruction information which it has detected; and an advertisement transfer section which advertises to other upper layer nodes the advertised obstruction information.