Optical fiber ring network 光纤环网
optical fiber ring network redundancy 光纤环网冗余
optical ring network 光环网 ; 光纤环型网
double ring redundant optical network 双环冗余光纤网络
twin-ring optical interconnection network 双环光互连网络
multi-channels optical ring network 多信道光纤环形网络
But the survival problem of optical network is still the focus of city rail transit, especially studying and using the ring optical network.
但是光网络的生存性问题仍旧是城市轨道交通关注的焦点,特别是对环形光网络研究和应用。
参考来源 - 轨道交通中SDH环形网络拓扑的增强生存性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
But the survival problem of optical network is still the focus of city rail transit, especially studying and using the ring optical network.
但是光网络的生存性问题仍旧是城市轨道交通关注的焦点，特别是对环形光网络研究和应用。
Resilient Packet Ring (RPR) is an IEEE standardized next-generation metro optical transport technology based on ring network topology .
弹性分组环（RPR）是一个由IEEE标准化的基于环网拓扑的新一代城域光传送技术。
The emphasis is on the characteristics of WDM fiber optic network, the principle of optical switching by selecting wavelength. At last the WDM star and ring networks are addressed as an example.
重点介绍了波分复用(WDM)光纤网络的特点、通过选择光波长实现光交换的原理、WDM星形和环形光网络的构成等。
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