| 摘要 |
The invention relates to an active star coupler based network handling of redundancy in the physical layer by transmitting a message to both regular ( 30, 32, 34, 36, 138, 140, 146 ) and redundant links ( 38, 148 ). In error free case the message is forwarded by the regular interface ( 12, 14, 16, 18, 114, 116, 122 ), while the redundant link ( 38, 148 ) is blocked. Each interface is equipped with a link failure detection logic ( 24, 132 ). If a link failure is detected, an incoming message is blocked and the affected interface controls the interface ( 20, 126 ) connected to the redundant link to take over message forwarding. If the link recovers, the regular interface takes over forwarding responsibility and the redundant link is disabled.
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