Each layer employs the services of the layer underneath, which enables a top layer protocol to transmit messages over the physical network.
每个层都使用下面一层的服务，这使得顶层协议能够在物理网络上传输消息。
Integrated protocol analyzer: protocol viewer, can quickly and thoroughly understand the relationship between the protocol layer and the physical layer data packets and time.
协议分析仪：选择集成的协议查看器，可快速、深入地了解协议层和物理层之间的数据包和时间关系。
The whole structure of the system was also introduced and the design method of node composing of physical layer and MAC layer protocol were given.
文章还介绍了系统的整体结构，针对系统的物理层节点构成、MAC层协议给出了具体的设计方法。
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