| 摘要 |
<p>Disclosed is a communication network system in which a plurality of nodes (2) are connected to a transmission path (1). A master candidate node is provided with an idle time measurement unit (9A) for measuring the idle time of the transmission path. When the master candidate node acquires a master right and becomes a master node, said node retains the master right until the idle time of the transmission path exceeds the right acquisition idle time duration of said node. When the idle time of the transmission path exceeds the longest right acquisition idle time duration of each master node, a root node transmits a start frame which indicates the start of the next communication cycle, and the idle time measurement unit is reset when the start frame is received.</p> |
