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. 27, 2011
Filed:
Jun. 22, 2009
Masahiko Mizutani, Yokohama, JP;
Yusuke Yajima, Fujisawa, JP;
Takayuki Kanno, Yokohama, JP;
Takeshi Yasuda, Yokohama, JP;
Masahiko Mizutani, Yokohama, JP;
Yusuke Yajima, Fujisawa, JP;
Takayuki Kanno, Yokohama, JP;
Takeshi Yasuda, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Communication time period measuring frames are simultaneously sent from an OAM adaptive device on a transmission side, to both a working path and a protection path. In an OAM adaptive device on a reception side, reception times of the frames having arrived from both the paths are checked so as to measure a time period difference between both the paths. The time period difference is fed back to a logic distance adjustment function of each PON section to determine required communication time periods of the PON sections respectively included in a working system and a protection system. Communication time periods of the working system and the protection system in a packet communication network are arbitrated in order to decrease a packet loss at line switching in a packet relaying network.