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一、概述众所周知,在一对线缆上可用频率和时间分割的方法,实现多复用.这样便以廉价的终端设备换取了昂贵的线缆,从而取得明显的经济效益.一般说来,终端机都是按频率或时间分割成一个个固定的通路,且不变地分配给每个用户使用.实际上,用户并非每时每刻都用,其中绝大部分时间是空闲不用的.可见,这是一极大的浪费.那么,可否在此空闲的时间给别的用户用呢?回答是肯定的.从多路通信的统计特性得知:在N路通信系统中,某一瞬间工作的路数可以是0到N的任何整数.若N路
I. Overview As we all know, in a pair of cables available frequency and time division method to achieve multi-use.This will be cheaper terminal equipment in exchange for expensive cables, so as to obtain significant economic benefits.In general, the terminal The machine is divided by frequency or time into a fixed path, and invariably allocated to each user to use.In fact, the user is not used all the time, most of the time is idle without the available.It can be seen, This is a tremendous waste. So, can this free time to other users? The answer is affirmative .Study from the statistical characteristics of multi-channel communication: in the N-channel communication system, a moment to work The number of lanes can be any integer from 0 to N. If N way