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. 11, 2007
Filed:
Jul. 09, 2001
Akihiro Yasuo, Kawasaki, JP;
Shigeatsu Samukawa, Kawasaki, JP;
Junichi Tamura, Kawasaki, JP;
Nobuyuki Umeda, Kawasaki, JP;
Hiroyuki Sato, Kawasaki, JP;
Tomohiro Shinomiya, Kawasaki, JP;
Jun Tanaka, Kawasaki, JP;
Akihiro Yasuo, Kawasaki, JP;
Shigeatsu Samukawa, Kawasaki, JP;
Junichi Tamura, Kawasaki, JP;
Nobuyuki Umeda, Kawasaki, JP;
Hiroyuki Sato, Kawasaki, JP;
Tomohiro Shinomiya, Kawasaki, JP;
Jun Tanaka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed is a ring network in which a plurality of transmitting apparatuses are connected in ring form so as to be capable of transmitting in each of upstream and downstream directions, working and protection channels are assigned to each direction and, when failure occurs in a transmission path, a transmit signal is looped back using the protection channel to effect rescue. The ring network includes an insert transmitting apparatus that incorporates a packet, which enters from a lower-order side, into a higher-order signal and transmits the signal to a transmission path, and a drop transmitting apparatus that extracts the packet from the higher-order signal and transmits the packet to another lower-order side. Monitoring is performed to determine whether communication between the insert and drop transmitting apparatus has become unrescuable owing to transmission-path failure. When communication has become unrescuable, the insert transmitting apparatus halts the transmission of the packet to the transmission path.