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.
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。
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