Fujitsu Corporation

Hidetoshi Kawamura

Kanji Naito

Kazunari Shiota

Isao Takata

Takashi Honda

Junichi Moriyama

Shinichi Fujiyoshi

Hiroshi Kanzawa

Michihiko Goto

Seiji Miyahara

Kumiko Uematsu

Yukie Yoshihara

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

Data arriving from a plurality of channels asynchronously to each other are respectively stored in separate FIFOs (). A controller () monitors the status of the FIFOs (), retrieves the stored data in a predetermined order, and multiplexes the data, together with timing data indicating the presence or absence of the data, into a serial signal having a frame structure in which time slots are fixedly assigned to the respective channels. On the serial data, the same value appears successively as data, and when the data is valid, the corresponding timing data changes from a 0 to a 1. When the data is invalid, the value of the corresponding timing data does not change.

Multiplexing method and apparatus suitable for transmission of overhead data arriving from many communication lines

A ring configuring method configures a network in which a plurality of nodes are connected linearly, and performs topology construction for the ring by circulating topology data through the respective nodes and collecting connection information of the respective nodes. The method includes the steps of providing in the topology data a flag indicating whether the connection information is collected in each node; inverting the flag at a terminal station which is an end node of the open ring, and turning the topology data there; causing the topology data to passing through a node other than any terminal station as it is; and adding the connection information to the topology data in each node according to the flag, and performing topology construction.

Ring configuring method and node apparatus used in the ring

Growing community of inventors

Fukuoka, Japan

Hidetoshi Kawamura