Hitachi, Ltd.

Kazuya Shimoyama

Tsutomu Yamada

Noritaka Matsumoto

Yoshihito Sato

Masayuki Miyazaki

May Takada

A multistage relay communication systemincludes a trunk networkand branch networks(), each of which includes one or more communication apparatuses. The communication apparatuscan switch between a trunk mode to operate in the trunk networkand a branch mode to operate in the branch network. In the trunk network, the communication apparatuscarries out fixing of a communication path and redundancy of data based on a path table in order to achieve real-timeness and a data arrival rate. Meanwhile, in the branch network, when a communication failure occurs, the communication apparatusautonomously searches for a communication path and constructs a path table, in order to at least secure a data arrival rate even if real-timeness is impaired within an allowable range.

Relay communication apparatus and multistage relay communication system

A communication device reduces a processing time required at the time of mutually converting different wireless or wired communication protocol and improves a real-time property. The communication device includes two or more communication units which communicate with two or more external devices and a communication controller which processes communication data. The communication controller has table information that associates a communication path, a type of the communication unit, and conversion-info, and an input and output unit that inputs and outputs the table information. According to the added conversion-info, a conversion unit sequentially performs various conversion processes (protocol conversion, routing, communication quality evaluation, fragmentation/integration of communication interface, fragment/defragment process, frame multiplication/integration, and frequency setting).

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Hitachi, Japan

Kazuya Shimoyama