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. 10, 2013
Filed:
Apr. 07, 2009
Norihiro Sakamoto, Chigasaki, JP;
Tohru Kazawa, Kokubunji, JP;
Yusuke Yajima, Fujisawa, JP;
Akihiko Tsuchiya, Fujisawa, JP;
Norihiro Sakamoto, Chigasaki, JP;
Tohru Kazawa, Kokubunji, JP;
Yusuke Yajima, Fujisawa, JP;
Akihiko Tsuchiya, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A passive optical network system such that the power consumption can be reduced as much as possible according to the end-user traffic. An OLT uses the DBA function thereof and sequentially uses frequencies in ascending order of transmission rate in order to sequentially allocate bands to ONUs in ascending order of the requested bandwidth. At this time, a frequency to be allocated is selected so that the bandwidth allocated to each ONU is narrower than a maximum bandwidth through which transmission using the allocated wavelength is enabled. An OLT uses a grant area to specify the transmission timing of the secondary station and to inform the specified transmission timing to the secondary station. In addition, an area is set for storing information used to inform the secondary station of a new frequency to be used.