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了解PCM电话光端机的作用
概念性的带大家了解下PCM电话光端机的作用。PCM电话光端机顾名思义其实也是一种光端机，但是他不仅仅只能传输电话的光端机。它的用户接口类型多样（包括语音、数据、图象），均以小型模块化部件方式装配到母板上，各种用户模块可以混合装配，方便扩容及维护。PCM电话光端…
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