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光端机厂家常见的8大问题及解决方法
(1) PDH光端机与SDH光端机有什么不同?在数字传输系统中.有两种数字传输系列.一种叫"准同步数字系列"简称PDH,另一种叫"同步数字系列"简称SDH.PDH(准同步数字系列)光端机是小容量光端机.一般是成对应用.叫点到点应用.容量一般为4＊E1.8＊E1.16＊E1.SDH…
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