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. 08, 2013
Filed:
Jan. 13, 2009
Masahiko Mizutani, Fujisawa, JP;
Yusuke Yajima, Fujisawa, JP;
Nobuyuki Yamamoto, Yokohama, JP;
Yoshihiro Ashi, Yokohama, JP;
Masahiko Mizutani, Fujisawa, JP;
Yusuke Yajima, Fujisawa, JP;
Nobuyuki Yamamoto, Yokohama, JP;
Yoshihiro Ashi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Switching process at the occurrence of a path trouble is performed more quickly to reduce the number of packet discards during a traffic transition from a currently used system path to a standby system path within a section to be protected. An OLT (-W) refers to the DBA information of a PON section and, if receiving no CCM frame at a timing at which the same should be received, then determines that some trouble has occurred on the path (S) and transmits, to an OAM-compliant NE (-Z), an application-for-switching frame () to notify the OAM-compliant NE (-Z) of the abnormal condition. The OAM-compliant NE (-Z) monitors the occurrence of the trouble within the PON section nearly in real time, starts a switching process (S) and generates and transmits a standby-system delivery request () (SS). An OAM-compliant NE (-A) switches the communication path to the standby-system passing through an OLT (-P).