Serial to Ethernet Connector 7.1 Build (7.1.876).rar
2023-08-18 14:52:36
4.79MB
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3.5 EtherNet/IP网络功能
第三讲 CJ2 PLC控制功能
基本概念
www.PLCworld.cn
2023-06-04 17:47:18
37.73MB
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4个Lane的Aurora仿真+chip2chip+ethernet
2023-04-07 22:57:06
371.81MB
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Ethernet Networks: Design, Implementation, Operation, Management.
Gilbert Held
pages: 598
2023-03-10 13:50:47
5.18MB
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目录
802.11 无线网络权威指南 .......................................................................................................... 1
(第 2 版) ..................................................................................................................................... 1
目录............................................................................................................................................ 3
序 ............................................................................................................................................. 14
前言.......................................................................................................................................... 16
第 1 章 无线网络导论.............................................................................................................. 24
1.1 为何需要无线？ 24
1.1.1 无线频谱：关键资源 .......................................................................... 25
1.2 无线网络的特色 27
1.2.1 没有实体界限..................................................................................... 27
1.2.2 动态实体介质..................................................................................... 27
1.2.3 安全性................................................................................................ 28
1.2.4 标准的好处......................................................................................... 29
第 2 章 802.11 网络概论......................................................................................................... 31
2.1 IEEE 802 网络技术规格 31
2.2 802.11 相关术语及其设计 33
2.2.1 网络类型 ............................................................................................ 34
2.2.2 再论传输系统..................................................................................... 37
2.2.3 网络界限 ............................................................................................ 38
2.3 802.11 网络的运作方式 40
2.3.1 网络服务 ............................................................................................ 40
2.4 移动性的支持 44
2.4.1 移动性网络设计 ................................................................................. 45
第 3 章 802.11 MAC ............................................................................................................... 47
3.1 MAC 所面临的挑战 48
3.1.1 射频链路质量..................................................................................... 48
3.1.2 隐藏节点的问题 ................................................................................. 49
3.2 MAC 访问控制与时钟 50
3.2.1 载波监听功能与网络分配矢量............................................................ 51
3.2.2 帧间隔................................................................................................ 52
3.2.3 帧间隔与优先程度.............................................................................. 53
3.3 利用 DCF 进行竞争式访问 54
3.3.1 DCF 与错误复原 ................................................................................. 55
3.3.2 使用重传计数器 ................................................................................. 55
3.3.3 DCF 与延迟 ........................................................................................ 55
802.11 无线网络权威指南 文档密级
华为三康机密，未经许可不得扩散 第 4 页, 共 508 页
3.3.4 Spectralink 语音优先性...................................................................... 56
3.3.5 帧的分段与重组 ................................................................................. 57
3.3.6 帧格式................................................................................................ 58
3.3.7 Frame Control 位............................................................................... 58
3.3.8 Duration/ID 位.................................................................................... 62
3.3.9 Address 位......................................................................................... 62
3.3.10 Basic Service Set ID (BSSID)...................................................... 63
3.3.11 顺序控制位....................................................................................... 63
3.3.12 帧主体.............................................................................................. 64
3.3.13 帧检验序列（FCS） ........................................................................ 64
3.4 802.11 对上层协议的封装 65
3.5 竞争式数据服务 66
3.5.1 广播与组播数据或管理帧................................................................... 66
3.5.2 单点传播帧......................................................................................... 67
3.5.3 省电程序 ............................................................................................ 69
3.5.4 多种速率支持（Multirate Support） .................................................. 71
3.6 帧的处理与桥接 72
3.6.1 无线介质到有线介质（802.11 至以太网） ........................................ 73
3.6.2 有线介质至无线介质（Wired Medium to Wireless Medium）........... 74
3.6.3 服务质量延伸功能.............................................................................. 75
第 4 章 802.11 帧封装细节 ..................................................................................................... 76
4.1 数据帧 76
4.1.1 Frame Control（帧控制） .........
2023-03-07 14:09:11
7.68MB
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802.3-2015 IEEE standard for Ethernet,include section1-6 in 1 PDF file
2023-03-02 11:38:58
53.2MB
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