| 摘要 |
A multiplexed network connecting apparatus comprising, communication lines for connecting in parallel a pair of LANs, relay stations each interposed between each of the communication lines and each of the LANs, transmission means for transmitting a transmission frame from a first LAN of the LANs to a second LAN, and bypass transmission paths each for connecting the relay stations. One of the first relay stations connected to the first LAN, which is designated as an operation system relay station, receives the transmission frame from the first LAN, transfers the transmission frame to the second LAN through the communication line connected to the operation system relay station, and transfers the transmission frame to another of the first relay stations, which is designated as a standby system relay station, through the bypass transmission path when the communication line connected to the operation system relay station malfunctions.
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