Fujitsu Corporation

Michihiko Goto

Kazuhiro Uchida

Hideyo Fukunaga

Tsutomu Noguchi

Masamichi Kasa

Shinichi Fujiyoshi

Manabu Tomiyasu

Hidetoshi Kawamura

Masahiko Iwakiri

Shigeki Oishi

Feng Zhang

There is provided a transmission apparatus including: a buffer provided with a queue for each of user flows, the buffer configured to store data in the queue for the user flow to which the data belongs; a storage unit configured to store a link list indicating an output order of the user flows; an issuing unit configured to issue a predetermined output permissible amount to the queue for the user flow by referring to the link list; and an output control unit configured to output data from the queue to which the output permissible amount is issued.

Transmission apparatus and transmission method

A communication system capable of communicating control information without decreasing the bandwidth available to users. A coder encodes a primary signal to generate encoded data such that the polarity of the encoded data alternates between positive and negative polarities. A polarity-reversed data generator reverses the polarity of part of the encoded data to generate polarity-reversed data. A transmitter transmits, as communication data, the encoded data including the polarity-reversed data. A receiver receives the communication data, and a polarity-reversed data detector determines whether or not the polarity of the received communication data alternates between positive and negative polarities, and detects, as the polarity-reversed data, data of which the polarity differs from an expected polarity. A polarity recognizer recognizes the polarity of the polarity-reversed data and treats the recognized polarity as control information.

Communication system

A communication device capable of restraining the packet transmission efficiency from lowering. An address storing unit extracts, from uplink packets, the addresses of terminals connected to sub-units and registers the addresses in an address management table. An address extracting unit extracts the address of a destination terminal included in a downlink packet output from a layer 2 switch, and an address determining unit determines whether or not the address of the destination terminal is registered in the address management table. In accordance with the result of the determination, a packet output unit outputs the downlink packet to a corresponding coupler.

Host unit in a passive optical network

Growing community of inventors

Fukuoka, Japan

Michihiko Goto