4 M1000 Mbps Wide Area Network 100 m1
计算机网络的分类 网络 距离 范围 速率 4 M~1000 Mbps Wide Area Network 100 m~1 大楼、校 0 km 园 1 km~ 城市 150 km 100~ 国家 1000 km 因特网Internet >1000 km 9. 6 k~256 kbps 局域网LAN Local Area Network 城域网WAN Metropolitan Area Network 广域网WAN 全球 56 k~45 M bps 9. 6 k~45 Mbps
介质共享访问方式 n n 静态方式,如TDMA, FDMA 动态方式: n n 受控方式:统计时分复用S-TDM 随机方式:ALOHA,CSMA Medium Sharing Techniques Static Channelization Dynamic Medium Access Control Scheduling Random Access
Figure 12 -1 OSI Model and Project 802 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -2 Project 802 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
IEEE 802. 3 MAC帧格式 802. 3 MAC Frame 7 1 Preamble SD Synch 2 or 6 Destination Address Start frame 0 Single address 1 Group address 0 Local address 1 Global address 2 or 6 Source Address 2 Length Information Pad 4 FCS 64 to 1518 bytes • Destination address is either single address or group address (broadcast = 111. . . 111) • Addresses are defined on local or universal basis • 246 possible global addresses Figure 6. 52
Figure 12 -3 PDU Format WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -4 PDU Control Field WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -7 MAC Frame WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
802. 11
Figure 12 -5 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -6 Evolution of CSMA/CD WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
(a) 以太网的组成 传输介质,HUB, 网卡, 作站 (b) Ethernet Processor RAM ROM RAM Figure 6. 10
CSMA/CD的特性 a = 0. 2 a = 0. 1 a = 0. 01 Figure 6. 51
Single collision domain 共享式 与交换 式以太 网 (a)共享式 High-Speed Backplane or Interconnection fabric (b)交换式 Figure 6. 56
快速以太网的应用 Ethernet Switch Server 100 Mbps links 与服务器的连 接采用 100 Mbps快速 以太网 Ethernet Switch 10 Mbps links Figure 6. 57
Figure 12 -8 Ethernet Segments WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -9 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -9 -continued 10 BASE 5 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -10 Transceiver WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -11 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -11 -continued 10 BASE 2 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -12 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -12 -continued 10 BASET WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -13 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -13 -continued 1 BASE 5 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -14 WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -15 WCB/Mc. Graw-Hill Token Passing The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -15 -continued WCB/Mc. Graw-Hill Token Passing The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -15 -continued WCB/Mc. Graw-Hill Token Passing The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -15 -continued WCB/Mc. Graw-Hill Token Passing The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -16 Token Ring Frame WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -17 WCB/Mc. Graw-Hill Data Frame Fields The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -17 -continued WCB/Mc. Graw-Hill Data Frame Fields The Mc. Graw-Hill Companies, Inc. , 1998
Figure 12 -18 Token Ring WCB/Mc. Graw-Hill The Mc. Graw-Hill Companies, Inc. , 1998
选作的习题 n n n Communication Networks一书中 Problems 4, 5, and 25 on Page 453 You don’t need to send answers to me.
MATLAB简介(3) http: //www. mathworks. com/
OPNET简介(3) http: //www. opnet. com/
- Slides: 108