| 摘要 |
A packet ring network system includes PHY selection circuits (3015, 3016) exclusively switching two interlink nodes connected to each other between a first connection state in which a packet is transmitted and received between one interlink node connected to the other interlink node and a first node and a second connection state in which a packet is transmitted and received between the first node and a second node, and a topology management circuit (3007) replacing all of address entries of destination nodes where a packet arrives beyond the interlink node in a topology database with an address of an adjacent interlink node. The PHY selection circuits (3015, 3016) switch the connection states of the two interlink nodes in a state that the nodes are transmitting a packet to and receiving a packet from each other using the address entries replaced by the topology management circuit (3007).
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