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E1線路的知識和接口協議，使用方法

目前在通信方面，在這么通信工程的時候，遇到不少企業在租借E1（2M）線路利用PCM設備傳輸語音電話、音頻等業務。可能大部分企業只對E1線路帶寬了解，而E1線路的具體知識點還是不太了解。1、一條E1是2.048M的鏈路，用PCM編碼。2、一個E1的幀長為256個bit,分為32個時隙，一…

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