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