星形拓扑，环形，树形和总线拓扑各自的特点是什么？
Star topology , ring , tree and bus topology what their characteristics?
针对双总线形、星形、环形和双环形四种光纤网络拓扑，比较它们的光纤需求长度、平均传播延迟、传输衰减、最大比特率及容错。
The comparison is in term of fiber required, average propagation delay, transmission loss, max bit rate, fault tolerance among four type topologies included bus, star, ring and dual ring.
星形结构在运行维护、传输时间等多方面优于总线型、环形结构，宜采用双星形结构构建过程层网络。
As star structure is superior over bus and ring structures in operational maintenance, transmission time and so on, dual-star structure is proposed for process level networking.
星形结构在运行维护、传输时间等多方面优于总线型、环形结构，宜采用双星形结构构建过程层网络。
As star structure is superior over bus and ring structures in operational maintenance, transmission time and so on, dual-star structure is proposed for process level networking.
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