TDM is a physical layer concept, it has no regard for the nature of the information that is being multiplexed onto the output channel.

分时多工属于实体层的概念，当资料被多工处理送到输出通道，是不需要理会资料种类的。

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The system as a whole has a quantized concept of time: time begins at 1 and increments every time signals propagate from one layer to the next.

系统作为总体上拥有一个量子化的时间概念：时间从1开始，并且当信号从某层传递到下一层时便会增加1。

youdao

Perhaps the most important concept to understand is that on the host machine each layer communicates with its corresponding layer on the remote machine.

也许，需要理解的最重要的概念是：主机上的每一层都与远程机器上的对应层通信。

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