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。
If so, is it possible to make it a redundancy double (dual) ring network to ensure the high reliability of the automation system?
如果能，是否可以构成冗余的双环形网络来保证自动化系统的可靠性？
Labyrinth seal and piston ring provide a dual sealing system, keeping oil clean and reducing wear.
曲径汽封和活塞环提供了双密封系统，使油保持洁净并减少磨损。
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