Physical protocol layer的意思|示意

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。

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。

The first part of HART protocol include chapter 2,3,4. Chapter 2 introduces the physical layer, data link layer and commands of the HART protocol.

第一部份HART协议部分包括第2、3、4章。 第2章介绍了HART协议，内容包括HART协议的物理层、链路层和命令层。

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。

The basic principle, key technology, physical layer structure and protocol structure are analyzed. Some Suggestions about network plan and construction for HSDPA are also given at last.

对HSDPA基本原理、关键技术、物理层结构和协议结构进行了分析和介绍，并对HSDPA的规划和组网给出了相关建议。

The thesis chooses the four-layers structure as the rudiment of our protocol stack system, which includes physical layer, data link layer, network layer and application layer.

本文选择了四层结构作为协议栈体系结构的雏形，即：物理层、数据链路层、网络层、应用层。