contents Computer Network Computer Networks Semester for 2020-2021(2) 郭萍授课 笔记整理By cky_008 Chapter 1 Introduction Chapter 2 The Physical Layer 2.3 Wireless Transmission 无线传输介质 2.4 Communication Satellites卫星通讯 2.5 Digital Mudulation and Multiplexing 数字调制与复用 2.6 The Public Switched Telephone Network 公共交换电话网 2.7 The Mobile Telephone System 移动电话系统 第一章重点内容及总结 Chapter 3 Chapter 4 Chapter 5