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:
Aug. 18, 2009
Filed:
Nov. 14, 2005
Optical access network method, optical access network, and optical switch for optical access network
Hiroyuki Kasai, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Takumi Nomura, Tokyo, JP;
Hirokazu Kobayashi, Tokyo, JP;
Kunitetsu Makino, Tokyo, JP;
Hiroyuki Endo, Tokyo, JP;
Hiroyuki Kasai, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Takumi Nomura, Tokyo, JP;
Hirokazu Kobayashi, Tokyo, JP;
Kunitetsu Makino, Tokyo, JP;
Hiroyuki Endo, Tokyo, JP;
NEC Communication Systems Ltd., Tokyo, JP;
Abstract
An optical access network method, an optical access network and an optical switch for an optical access network, capable of solving all the three problems in the conventional GE-PON: transmission distance problem, security problem and communication interference problem. The optical access network comprises an OLT, a plurality of ONUs and one or more stages of optical switches, which are connected one another. In the direction from the OLT to the ONU, each frame (packet) transmitted from the OLT to one of the ONUs is checked so that only the destination ONU specified in the frame (packet) is connected to the OLT. In the direction from the ONU to the OLT, a control message transmitted from the OLT to one of the ONUs is checked so that only one ONU which has been given a transmission allowance from the OLT is connected to the OLT with respect to each frame (packet).