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目前国内大部分电力专网都已建有SDH光环网，它具有自愈环功能，当一端光纤线路中断了还可以从另外一端将数据传输过去。但并不是每一个SDH设备都处于环网里，就好比一些省市地域广阔，电力通信线路比较长，某一些变电站形成自愈环比较困难，不但投资大，需要的光缆资源多，…
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