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.
穿过此区的折射因低速而有延迟，又由于透射损失而有衰减。
Refractions which transit the zone will be delayed because of low velocity and attenuated because of transmission loss.
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