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。
Connectors for electronic equipment - tests and measurements - part 14 - 6 : sealing tests - test 14f : interfacial sealing iec 60512 - 14 - 6 : 2006 ; german version en 60512 - 14 - 6 : 2006 测量和控制数字数据通信工业控制系统用现场总线类型3 ： profibus规范第4部分：数据链路层协议规范
2 . the core part of this thesis ff procotol stack and the data link layer . the subprotocol is analysed and the whole development solution is presented here 这部分是本论文的核心内容，作者结合自己的实际开发过程分析了ff的关键部分? ?数据链路层，并提供了具体的解决方案。
Information processing systems - data communication . high - level data link control balanced classes of procedures . data - link layer address resolution negotiation in switched environments 信息处理系统数据通信高级数据链路控制平衡类规程交换环境中数据链路层地址的决定协商
Information processing systems . data communication . high - level data link control balanced classes of procedures . data link layer address resolution negotiation in switched environments 信息处理系统.数据通信.程序的高级数据链路控制平衡分类.在转换环境下数据链路层地址判断协议
Osi / rm classify the structure of the network into application layer , presentation layer , session layer , transport layer , network layer , data link layer and physical layer Osi / rm将计算机网络将网体系结构划分为应用层、表示层、会话层、传输层、网络层、数据链路层和物理层七个层次。
The six layers are : wireless physical layer , wireless data - link layer , network layer , transport layer , mobile computing application supporting environment , and application layer 六个层次是：无线物理层、无线数据链路层、无线网络层、无线传输层、移动计算应用支撑环境和移动应用层。
Connectors for electronic equipment - tests and measurements - part 13 - 1 : mechanical operation tests - test 13a : engaging and separating forces iec 60512 - 13 - 1 : 2006 ; german version en 60512 - 13 - 1 : 2006 测量和控制数字数据通信工业控制系统用现场总线类型3 ： profibus规范第3部分：数据链路层服务定义
I also analyze the physical layer , data link layer and the progress of the protocol , etc . then i introduce the algorithm of automatic repeat request and calculate the utilization ratio of the link 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。
The former realize hart protocol data link layer and command layer ; the latter realize data collection , processing and controlling . the system works in interrupt manner to satisfy real - time demand 其中hart通信程序为hart协议数据链路层和应用层的软件实现，测控程序主要包括数据采集、数据处理和控制运算的部分。
