本文主要讨论贵阳市教育城域网的主干网络设计，主要涉及网络的拓朴结构、光纤网络设计、路由设计、设备参考选型和将来网络扩展等方面的问题。
This paper mainly discusses the backbone design of Guiyang educational metropolitan area network, including network topology, fiber network, route design, network devices and network expansion, etc.
光纤以太网把以太网技术扩展到LAN之外，进入城域网（MAN） 。
The optical Ethernet extends Ethernet technologies from LAN to metropolitan area network(MAN).
根据城域网的定位及作用，对城域光网络的结构、组网原则和光纤选用等问题进行了讨论。
The architecture of metro optical network, networking principles and the selection of optical fiber cable are discussed in accordance with metro network positioning and function.
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