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E1线路的知识和接口协议，使用方法
目前在通信方面，在这么通信工程的时候，遇到不少企业在租借E1（2M）线路利用PCM设备传输语音电话、音频等业务。可能大部分企业只对E1线路带宽了解，而E1线路的具体知识点还是不太了解。1、一条E1是2.048M的链路，用PCM编码。2、一个E1的帧长为256个bit,分为32个时隙，一…
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