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。
This technology auto accomplished in physical layer, no need upper protocol layer support, has the strongpoint of fast switching and short application resume time.
该技术完全在物理层自动完成，无需上层协议的支持，具有快速切换和业务恢复时间短等优点。
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。
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 communication protocol is designed in term of three layers: Physical layer, Media Access Control layer and Logic Link Control layer.
本通信协议分为物理层、介质访问控制层和逻辑链路控制层三层设计。
The media access control (MAC) protocol of mobile Ad Hoc networks (MANETs) is closely-related with its physics layer, most MAC protocols request the capability of carrier sense in physical layer.
无线自组网的介质访问控制(MAC)协议是与物理层密切相关的，大多数MAC协议都要求物理层具备载波感知能力。
The design of HART protocol physical layer based on HT2015 and AD421 is introduced in detail upon the requirement of HART protocal physical layer.
针对HART协议物理层的要求，详细介绍了基于HT2015和AD421的HART协议通信物理层设计。
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。
The physical layer is assumed to be error free and thus the protocol becomes extremely simple and highly efficient.
物理层假定是不会出错的，因此该协议十分简单而高效。
NS was used to establish UWB network model and implement a MAC protocol combining the coding technology of the physical layer. It was compared with several traditional MAC protocols.
文中运用NS网络仿真软件搭建了完整的UWB网络环境，实现了一种融合物理层编码技术的MAC协议，并与几种传统的MAC协议进行了仿真分析比较。
The modem requires a block of external memory for the protocol stack, layer 1 and physical layer code.
猫的协议栈、第一层和物理层代码需要使用一外部存储器区。
It describes physical layer information flows according to the B-ISDN Protocol reference model and identifies interface functions.
它根据B- ISDN协议参考模型描述了物理层信息流并确定了接口功能。
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 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。
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