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. 13, 2005
Filed:
Aug. 29, 2000
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Takashi Mori, Yokohama, JP;
Masahiro Takatori, Yokohama, JP;
Yukio Hayashi, Fujisawa, JP;
Shinichi Kuwano, Yokohama, JP;
Sunao Kakizaki, Kawasaki, JP;
Hideaki Tsushima, Komae, JP;
Takashi Mori, Yokohama, JP;
Masahiro Takatori, Yokohama, JP;
Yukio Hayashi, Fujisawa, JP;
Shinichi Kuwano, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical one-to-one protection switching apparatus exchanges signals between a transmit node and a receive node. If a fault is detected in the first transmission line (down-stream), a controller in the node controls a drive circuit so as to shut off a gate. Then, the controller in the transmit node upon receiving a switching request from the receive node, controls the drive circuit so as to shut off the gate. Thereby, the optical switch is switched. The transmitter of the client terminal is thus connected to the second transmission line (down-stream). Upon receiving the switching request from the transmit node, the optical switch in the receive node is switched. Thereby the receiver in the client terminal is connected to the second transmission line (down-stream).