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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Our investment in space exploration helped to create our satellite telecommunications network and the Global Positioning System.

CNN: Bush: 'It is time for America to take the next steps' in space

And by using the global positioning satellite network, vessels' positions can be monitored automatically, as is already the case around the Great Barrier Reef in Australia and the Georges Bank off the coast of Maine.

ECONOMIST: Marine conservation

In line with the recent re-positioning of Twitter as not a social network, but an information and content network, Trammell believes his own experience reflects how others are actually using the service these days.

FORBES: The Story Behind Twitter's First Video Ad: 1 Million Views In One Day