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. 07, 1999
Filed:
Jul. 18, 1997
Applicant:
Inventor:
Tadayuki Takada, Yokohama, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ; H04B / ;
U.S. Cl.
CPC ...
359124 ; 359110 ; 359152 ; 370221 ;
Abstract
For wavelength division multiplexing transmission, a standby-system processor capable of handling all wavelengths is included in relation to a plurality of working system processors associated with different wavelengths. If any of the plurality of working system processors fails, the wavelength of a light wave to be processed by the standby-system processor is controlled according to the wavelength being handled by a current- system processor that has failed. A switching unit switches the working system processor that has failed to the standby-system processor.