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:
Apr. 27, 2004
Filed:
Feb. 29, 2000
Kazuhiro Uchida, Fukuoka, JP;
Kazuya Ryu, Fukuoka, JP;
Kanna Okamura, Fukuoka, JP;
Masashi Shibata, Fukuoka, JP;
Shinichi Fujiyoshi, Fukuoka, JP;
Katsuhiko Hirashima, Fukuoka, JP;
Toshinori Koyanagi, Kawasaki, JP;
Toshiyuki Sakai, Kawasaki, JP;
Setsuo Abiru, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical line terminal which sends and receives messages or data to/from optical network units (ONUs) connected thereto. A cyclic message monitor produces a trigger signal, for use in a PLOAM grant generator, at certain intervals in harmonization with upstream messages that a specific optical network unit regularly transmits. A downstream message monitor watches outgoing downstream messages to detect a certain message requesting an ONU to return a response, and it triggers the PLOAM grant generator if such a message is detected. An upstream message monitor detects an upstream message whose identification code indicates that the sending ONU has no information to return. If such an upstream message is found, it limits the issuance of PLOAM grants to that optical network unit. The PLOAM grant generator produces PLOAM grants which permit ONUs to transmit their messages, and sends them out through a PLOAM cell transmitter.