第6章通信与网络通讯网络的组成“ Any one in the world could be your customer;any one in the world could be your competitor."网络模型NetworkModel:A communication network is any arrangementwhere a sender transmits a message to a receiverover a channel consisting of some type of medium
通讯网络的组成 “ Any one in the world could be your customer; any one in the world could be your competitor.” 网络模型 Network Model: A communication network is any arrangement where a sender transmits a message to a receiver over a channel consisting of some type of medium 第6章 通信与网络
R调制一解调器MTCM前端处理机终端终端控制器解调器调制一计算机FEPnMTCMT：终端(teriminal).图6.1以单计算机为中心的远程联机系统1
图6. 1 以单计算机为中心的远程联机系统
H2HHHIMP2IMPIMPHsHiIMPsIMPiIMP4IMP3H3H4H:主机(host)IMP：接|「报文处理机(interfacemessageprocessor）图6.2存储转发的计算机网络
图6. 2 存储转发的计算机网络
局域网A局域网D通过Modem远程访问中央服务器(总部）局域网B组织的局域网数据库局域网C图6.4 某人寿保险公司的局域网和广域网
组织的 数据库 通过Modem远程 访问中央服务器 (总部） 局域网A 局域网B 局域网C 局域网E 局域网D 图6. 4 某人寿保险公司的局域网和广域网
(a)星型结构(b)环型结构(c)树型结构图6.5点到点式网络的拓扑结构
图6.5 点到点式网络的拓扑结构 (a)星型结构 (b)环型结构 (c)树型结构
卫星(a)总线型(b)卫星和无线电式图6.6广播式网络拓扑结构
图6. 6 广播式网络拓扑结构 卫星 (a)总线型 (b)卫星和无线电式
内芯屏蔽绝缘材料塑料外层图6.7同轴电缆结构图
图6.7 同轴电缆结构图
电信号光信号光信号光源放大器驱动器光检测光红)图6.8光纤传输
图6. 8 光纤传输
21235Tele-softw-Tele-Tele-Tele-End userareChannelscomputerprocessorsprocessors&ComputerMedia
1 2 3 4 5 End user Tele- Tele- Telecomputer processors Channels processors & Media Computer 2 Telesoftware
五种基本部件1. Terminals2.Tele- processors Modem, multiplexes & front-endprocessors, Digital to Analog or back, Code & decodedata, Control the accuracy & efficiency.3. Telecommunication channels & media Copper wires,Coaxial cable, Fiber optic cables, microwave's system,Communications satellites.4.ComputersMainframe,→ Host computersMinicomputer Front end processorsMicrocomputerNetwork server5. Tele-control softwareMonitors (Mainframe)Network operating systems (Micro)Communication package (Micro)
五种基本部件 1. Terminals 2. Tele- processors Modem, multiplexes & front-end processors, Digital to Analog or back, Code & decode data, Control the accuracy & efficiency. 3. Telecommunication channels & media Copper wires, Coaxial cable, Fiber optic cables, microwave’s system, Communications satellites. 4. Computers Mainframe, Host computers Minicomputer Front end processors Microcomputer Network server 5. Tele-control software Monitors (Mainframe) Network operating systems (Micro) Communication package (Micro)