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.

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。

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Two more metro lines are due to open by 2012, stretching the network to 500 kilometers and likely boosting the average number of passengers to more than 8 million a day, the booklet said.

宣传册上称，2012年之前将会新增两条地铁线路，线路绵延500公里，且每日平均载客量将有望超过8百万人次。

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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。

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The station is currently used as a station on the Tyne and Wear Metro network.

BBC: NEWS | UK | England | Tyne | Victorian station revamp begins

Nexus has put together a 20-year programme to ensure the Metro network survives - dubbed Project Orpheus.

BBC: The Tyne and Wear Metro network is 25 years old

O2 will begin installing the Metro wireless network across Westminster this month, initially being available in limited areas before being rolled out across both boroughs.

BBC: 'Europe's biggest' free wi-fi zone set for London