Then it sends the frame up to the data link layer.
然后向它发出的数据链路层帧。
The key technology of net-charging based on data-link Layer is the capture and analysis of data frame.
基于数据链路层的网络计费方式中关键的技术在于链路层数据包的捕获及分析。
Then I introduce the concepts about level design and make the frame structure of the Proximity link protocol. I also analyze the physical layer, data link layer and the progress of the protocol, etc.
然后采用了协议的分层设计概念，根据协议要求制定了帧格式，详细分析并设计了物理层、数据链路层和协议工作流程等。
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