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:
Sep. 10, 2013
Filed:
Feb. 02, 2004
Hisashi Kojima, Tokyo, JP;
Takashi Kurimoto, Tokyo, JP;
Ichiro Inoue, Tokyo, JP;
Tomonori Takeda, Tokyo, JP;
Takashi Miyamura, Tokyo, JP;
Keisuke Kabashima, Tokyo, JP;
Nobuaki Matsuura, Sayama, JP;
Michihiro Aoki, Tokyo, JP;
Shigeo Urushidani, Tokyo, JP;
Hisashi Kojima, Tokyo, JP;
Takashi Kurimoto, Tokyo, JP;
Ichiro Inoue, Tokyo, JP;
Tomonori Takeda, Tokyo, JP;
Takashi Miyamura, Tokyo, JP;
Keisuke Kabashima, Tokyo, JP;
Nobuaki Matsuura, Sayama, JP;
Michihiro Aoki, Tokyo, JP;
Shigeo Urushidani, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical network has: sections for establishing optical paths; a plurality of optical edge routers for connecting external IP networks to the optical network (); and a plurality of optical cross connects, for connecting the optical edge routers by the optical paths, having switching sections with respect to an optical pulse unit. In the optical network, each of the optical edge routers has both of: (1) an optical network control instance (INSp) for maintaining topology information in the optical network and switching/signaling the optical paths; and (2) an IP network instance (INSi) for maintaining a routing table in each of the external IP networks and activating routing protocols between the external IP networks and the IP network instance. By doing this, it is possible to realize a multi-layer cooperative function and provide highly safe optical networks, etc.