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:
Oct. 23, 2007
Filed:
Jan. 13, 2006
Yuji Shimada, Kawasaki, JP;
Hiroaki Tomofuji, Kawasaki, JP;
Takuji Maeda, Kawasaki, JP;
Takeshi Sakamoto, Kawasaki, JP;
Ichiro Nakajima, Kawasaki, JP;
Yuji Shimada, Kawasaki, JP;
Hiroaki Tomofuji, Kawasaki, JP;
Takuji Maeda, Kawasaki, JP;
Takeshi Sakamoto, Kawasaki, JP;
Ichiro Nakajima, Kawasaki, JP;
Fujitsu limited, Kawasaki, JP;
Abstract
A method for switching a transmission route in an optical network. A regenerator station extracts a main signal, and detects the input level of the main signal. When the input level falls below a threshold, the regenerator station determines that a failure occurs, and stops output of a main signal from the regenerator station, and transmits a control signal indicating occurrence of the failure to a receiver station, which separates the control signal from a main signal transmitted thereto, detects the input level of the main signal at the receiver station, analyzes the separated control signal, and determines whether or not a failure occurs. When the input level of the main signal at the receiver station falls below a threshold, or when the separated control signal indicates occurrence of a failure, the receiver station detects the occurrence of the failure, and switches the transmission route.