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:
Jul. 20, 2010
Filed:
Aug. 08, 2007
Toshimi Kida, Fukuoka, JP;
Kazuhiro Uchida, Fukuoka, JP;
Toshimi Kida, Fukuoka, JP;
Kazuhiro Uchida, Fukuoka, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an optical transmission method and device of a point-multipoint type, whether or not identification information of an optical network unit designated is received within a fixed phase tolerance for a transmission enabling phase designated to optical network units on multipoint sides is determined. When it is determined that no identification information of the optical network unit designated is received and identification information of any optical network unit is received up to a transmission enabling phase subsequently designated, a transmission stop command is transmitted to the optical network unit whose identification information is received. Also, when abnormality is detected in transmitted data from the optical network unit designated or any optical network unit within a transmission enabling duration designated for the transmission enabling phase designated to the optical network units, a transmission enabling duration reducing command is transmitted to the optical network unit or all of the optical network units respectively. Thereafter, when the identification information of the optical network unit designated is received within a fixed phase tolerance for the transmission enabling phase designated to the optical network units and identification information of another optical network unit is also received up to a transmission enabling phase subsequently designated, a transmission stop command to the other optical network unit and a command for restoring the transmission enabling duration for the optical network unit and all of the optical network units are transmitted.