接着从互连拓扑方式出发，系统地介绍了总线式、交叉开关式、开关枢纽式的不同系统结构及其内在联系。

Then the definite architectures of bus, interleare switch, switch hub types and interconnection are stated systematically from an interconnected topologic way.

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枢纽通常包括一个开关的一些实物。

A hub usually includes a switch of some kind.

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介绍了内昆线六盘水枢纽接触网负荷开关监控系统，并结合该系统给出了其安装调试的方法及注意要点。

Introduces the load-break switch monitor system of OCS in Liupanshui railway conjunction, offers methods and precautions for its installation and commissioning.

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