高比特律数字用户环路HDSL ？

High - bit - rate Digital Subscriber Loop?

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高速数字用户环路HDSL ？

High - speed Digital Subscriber Loop?

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目前国内用户环路测试的市场需求正在迅速增加。

At present domestic market demand for subscriber loop test is increasing quickly.

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介绍了用户环路接入网的概念、结构及接口的演变等。

The article presents the concept, structure and interface evolution of the subscriber loop access network.

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介绍了用户环路接入网的概念、结构及接口的演变等。

The article presents the concept, structure and interface evolution of the subscriber loop access network.

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