Fujitsu Corporation

Kenji Taniguchi

Masashi Hirome

Tsuyoshi Matsumoto

Hiroaki Nagao

Hidetoshi Amari

Noriyuki Kimura

Takashi Tai

Keiichi Furukawa

A ring transmission system includes nodes connected in a ring shape by transmission lines to communicate with each other. Each node includes a cell extracting unit which receives a cell from the transmission lines and separates a control field from the cell in accordance with a communication control procedure, the control field including a number of bits containing management data and a destination, the management data indicating information related to maintenance and operation of the ring transmission system. A separating unit separates, from the control field, one of management data for the node and management data for another node by comparing the destination with an identification of the node. A management data processing unit generates processed management data from the management data when the destination indicates the node. An intermediate unit generates a new cell containing the management data from the separating unit when the destination indicates the another node. The management data of the new cell is distinctly different from the processed management data. The intermediate unit transmits the new cell to the transmission lines.

Ring transmission system for providing efficient transmission of

In a ring transmission path, a synchronous multiplexing technique using pointer control is employed. To stabilize pointer values, at least one node is set as a master node. At the master node, the amount of delay by which to delay transmit data is made variable in order to place the transmit data in a fixed position in a transmitted frame regardless of its position in a received frame. At other nodes, the position of the transmit data in the transmitted frame is made variable in order to delay the transmit data by a fixed amount of delay. When the master node is bypassed because of a failure of the master node, etc., the adjacent node downstream detects that state and switches, automatically, to a master node.

System for controlling delays in a ring by assembling subframes with a

The present invention provides an interconnection network with a self-routing function which is suitable for use with an ATM exchange and can effect routing processing in a reduced latency while assuring a function equivalent to that of a conventional Batcher-banyan network. The interconnection network comprises 2.sup.i N/2.sup.i -input N-output Batcher-banyan networks connected in parallel to each other and each including a Batcher sorting network, comparison/blocking means, concentration means and a banyan network.

Interconnection network with self-routing function

Growing community of inventors

Kawasaki, Japan

Kenji Taniguchi