信息網(wǎng)絡(luò)通信基礎(chǔ)-文庫(kù)吧資料
2025-01-04 12:51本頁(yè)面
【正文】 ion at a distance. The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data munications are the exchange of data between two devices via some form of transmission medium such as a wire cable. Components 組成 Data Representation 數(shù)據(jù)表示 Data Flow 數(shù)據(jù)流 Topics discussed in this section: 6 Data Communications Networking Data munications are the exchange of data between two devices via some form of transmission medium such as a wire cable. The effectiveness of a data munications system depends on four fundamental characteristics: 1. Delivery. 傳遞性 The system must deliver data to the correct destination 2. Accuracy. 準(zhǔn)確性 3. Timeliness. 及時(shí)性 4. Jitter. 抖動(dòng)性 Jitter refers to the variation in the packet arrival time. (audio or video) 7 Data Communications Networking Figure Five ponents of data munication 1. Message 報(bào)文 2. Sender 發(fā)送方 3. Receiver 接受方 4. Medium 介質(zhì) 5. Protocol 協(xié)議 8 Data Communications Networking Data Representation 數(shù)據(jù)表示 ? Text 文本 ? Numbers 數(shù)字 ? Images 圖像 ? Audio 音頻 ? Video 視頻 9 Data Communications Networking Figure Data flow (simplex, halfduplex, and fullduplex)p6 數(shù)據(jù)流分為單工、半雙工和雙工 10 Data Communications Networking 12 NETWORKS 網(wǎng)絡(luò) A work is a set of devices (often referred to as nodes) connected by munication links. A node can be a puter, printer, or any other device capable of sending and/or receiving data generated by other nodes on the （ 常常被稱為網(wǎng)絡(luò)節(jié)點(diǎn) ） Distributed Processing 分布式處理 Network Criteria 網(wǎng)絡(luò)準(zhǔn)則 Physical Structures物理結(jié)構(gòu) Network Models網(wǎng)絡(luò)模型 Categories of Networks網(wǎng)絡(luò)分類 Interconnection of Networks: Interwork網(wǎng)絡(luò)互聯(lián)：
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