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:
Mar. 20, 2012
Filed:
May. 15, 2008
Masao Niibe, Yokohama, JP;
Tohru Kazawa, Kokubunji, JP;
Yusuke Yajima, Fujisawa, JP;
Takeshi Kiyose, Fujisawa, JP;
Masahiko Mizutani, Yokohama, JP;
Masao Niibe, Yokohama, JP;
Tohru Kazawa, Kokubunji, JP;
Yusuke Yajima, Fujisawa, JP;
Takeshi Kiyose, Fujisawa, JP;
Masahiko Mizutani, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A passive optical network system (PON) has a plurality of OLTs and ONUs with different transmission rates. OLTs with different transmission rates share information of priority frames and destinations, and determine timing for frame transmission to ONUs so that the signal from each of the OLTs does not collide when multiplied in a splitter. OLTs transmit the data to the ONU as a burst signal to prevent the signals with different rates from colliding. ONU acquires the information of the following burst frames. ONU receives only the signal addressed to the own ONU or with the transmission rate of own ONU, therefore errors in ONUs can be avoided. OLT receives only the signal with the transmission rate of own OLT from ONUs based on the transmission timing from the ONUs shared by the line terminators, errors in OLTs can be avoided.