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。
Simulant system for training comprise of the transit instrument which has been provided by optical measure equipment without any change and the newly developed simulant sub-system for training.
模拟训练系统由原经纬仪和新研制的模拟训练分系统组成，模拟训练系统不对经纬仪做任何改动。
This paper introduces the principle and transformation situation of replacing cable with optical fiber for DC1500V intertrip signal transmission in Dalian Express Rail Transit No. 3 Line.
本文详细介绍了大连快轨三号线牵引供电系统中直流1500V联跳信号的传输由电缆改为光缆的原理和改造情况。
This paper introduces the principle and transformation situation of replacing cable with optical fiber for DC1500V intertrip signal transmission in Dalian Express Rail Transit No. 3 Line.
本文详细介绍了大连快轨三号线牵引供电系统中直流1500V联跳信号的传输由电缆改为光缆的原理和改造情况。
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