评论信息_光端机里的E1 口是什么意思？

光端机里的E1 口是什么意思？

光端机里的E1 口是什么意思？欧洲的30路脉码调制PCM简称E1，速率是2.048Mbit/s 。我国采用的是欧洲的E1标准。 E1的一个时分复用帧（其长度T=125us 即取样周期125微秒）共划分为32相等的时隙，时隙的编号为CH0~CH31。其中时隙CH0用作帧同步用，时隙CH16用来传送信令，剩下…

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