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+


### 2. 时分复用 时分复用的所有主机在不同的时间占用相同的频率带宽资源。 -

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使用频分复用和时分复用进行通信,在通信的过程中主机会一直占用一部分信道资源。但是由于计算机数据的突发性质,通信过程没必要一直占用信道资源而不让出给其它用户使用,因此这两种方式对信道的利用率都不高。 @@ -235,7 +235,7 @@ TCP/IP 体系结构不严格遵循 OSI 分层概念,应用层可能会直接 是对时分复用的一种改进,不固定每个用户在时分复用帧中的位置,只要有数据就集中起来组成统计时分复用帧然后发送。 -

+

### 4. 波分复用