Importance

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Abstract

To provide a technology capable of improving fault-tolerance by redundancy-structuring each of ring nodes building up a ring network with an active termination block and a non-active termination block and, if a fault occurs in the active termination block, continuing an operation by switchover to the non-active termination block. A ring node is configured such that data from a terminal side is forwarded to an active termination block and to a non-active termination block, source information of the data is determined and registered in a database, the data is transmitted to the ring from a ring-side interface, the data received from the ring is forwarded to the active termination block and to the non-active termination block, destination information of the data is determined by referring to the database and forwarded to a terminal-side interface, and the terminal-side interface selects the data from the active termination block and forwards the selected data to the terminal side.

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First Claim