Fujitsu Corporation

Hidetoshi Amari

Tsuyoshi Matsumoto

Koji Matsunaga

Junichi Sawada

Masashi Hirome

Shinji Takao

Tatsuya Toyozumi

Toshiyuki Yoshida

Kanna Okamura

Kenji Taniguchi

Hiroki Tamura

Kenichi Ishikawa

Takaharu Kajiwara

Koichiro Nakayama

Takeo Kubo

Keiichi Furukawa

A wireless repeater on a communication line has a structure that includes a plurality of wireless communication media, and a band control unit that changes the first bandwidth of the communications line according to increase and decrease in the number of wireless communication media by an operation dividing the first bandwidth of the communications line into a plurality of second bandwidths and an operation multiplexing a plurality of second bandwidths adjusting to the first bandwidth, responding to the number of the wireless communication media.

Wireless repeater, the method for wireless repeating, and data communications system

A transmission device capable of configuring a communication network over which MC packets are forwarded in a way that does not use bands with futility is disclosed. The transmission device is so configured to transmit, when receiving a multicast packet from a host, to the other transmission device the multicast packet that is to be discarded by the transmission device having no necessity of forwarding the received multicast packet to the next transmission device.

Transmission device

The present invention relates to a frame communication system composed of a code converter and a frame generator/decomposer. In order to improve a line efficiency without encapsulating transmitting data, a code converter in a frame transmitting device converts at least different specific codes X and Y within the transmitting data respectively into codes (Y, A) and (Y, B) composed of the code Y and at least specific codes A and B different from each other, and a frame generator prepares a frame of the transmitting data with the code X as a frame boundary. A frame decomposer in a frame receiving device recognizes a specific code X as a frame boundary to decompose receiving data, and a code converter converts codes (Y, A) and (Y, B) within the receiving data composed of a specific code Y, and specific codes A and B into codes X and Y.

Frame communication system

A collective monitor and control for plural networks, in which plural networks remotely located in each other can be collectively monitored, is provided. The collective monitor and control system for plural networks includes independent plural networks, each having plural nodes formed into a ring configuration, transmission paths connecting the plural networks and passing only monitor and control data, and a network service processor connected to one node of the plural networks, the one node connected to the network service processor having a switch circuit for broadcasting the monitor and control data received from one route to other routes linked to the one node.

Collective monitor and control system for plural networks

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

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Kawasaki, Japan

Hidetoshi Amari