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:
Nov. 10, 2009
Filed:
Mar. 03, 2006
Takumi Nomura, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Kunitetsu Makino, Tokyo, JP;
Hiroyuki Kasai, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiroaki Kurokawa, Tokyo, JP;
Hirokazu Kobayashi, Tokyo, JP;
Hiroyuki Endo, Tokyo, JP;
Takumi Nomura, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Kunitetsu Makino, Tokyo, JP;
Hiroyuki Kasai, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiroaki Kurokawa, Tokyo, JP;
Hirokazu Kobayashi, Tokyo, JP;
Hiroyuki Endo, Tokyo, JP;
NEC Communications Systems, Ltd., Tokyo, JP;
Abstract
To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access network which can give the connection start time of the upstream optical switching element of the optical switch module. To the optical switch module, ranging functions are provided and the center device OLU carries out ranging of the optical switch module OSM as is the case of ranging of the remote device ONU. The center device OLU transmits the difference between roundtrip time of the remote device ONU and roundtrip time of optical switch module OSM, which is the result of these rangings, to the optical switch module OSM, and the optical switch module OSM can obtain the contact start time of the upstream optical switching element by calculating the contact start time using the difference.