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目前國內大部分電力專網都已建有SDH光環網，它具有自愈環功能，當一端光纖線路中斷了還可以從另外一端將數據傳輸過去。但并不是每一個SDH設備都處于環網里，就好比一些省市地域廣闊，電力通信線路比較長，某一些變電站形成自愈環比較困難，不但投資大，需要的光纜資源多，…
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