Unit 1 Communication Networks（通信网） 1
New Words Phrases and Abbreviations 2
Notes to the Passage 3
Exercises to the Passage 4
Reading Material Telephone services（电话业务） 6
Unit 2 Transmission and Switching Technology（传输与交换技术） 9
New Words Phrases and Abbreviations 11
Notes to the Passage 11
Exercises to the Passage 13
Reading Material Cellular Telephone Systems（蜂窝电话系统） 14
Unit 3 Development and Classification of Optical Fiber（光纤的发展与分类） 17
New Words and Phrases 18
Notes to the Passage 19
Exercise to the Passage 20
Reading Material Fusing Fibers（光纤的熔接过程） 22
Unit 4 Computer Hardware（计算机硬件） 24
New words Phrases and Abbreviations 25
Notes to the Passage 26
Exercises to the Passage 27
Reading Material What Is a Computer System（什么是计算机系统） 29
Unit 5 The Central Processing Unit（中央处理单元） 32
New Words Phrases and Abbreviations 33
Notes to the Passage 34
Exercise to the Passage 35
Reading Material Operating System（操作系统） 37
Unit 6 Data Transmission Media（Ⅰ）（数据传输媒介（Ⅰ）） 40
New Words Phrases and Abbreviations 42
Notes to the Passage 43
Exercises to the Passage 44
Reading Material Modems（调制解调器） 46
Unit 7 Data Transmission Media（Ⅱ）（数据传输媒介（Ⅱ）） 48
New Words and Phrases 50
Notes to the Passage 50
Exercises to the Passage 51
Reading Material Computer Security（计算机安全） 53
Unit 8 Communication Satellite Systems（卫星通信） 57
New Words Phrases and Abbreviations 59
Notes to the Passage 59
Exercises to the Passage 60
Reading Material Bluetooth Technology（蓝牙技术） 62
Unit 9 Communication Facilities（通信设备） 65
New Words Phrases and Abbreviations 66
Notes to the Passage 67
Exercises to the Passage 68
Reading Material Paging System（寻呼系统） 69
Unit 10 Software（软件） 72
New Words and Phrases 73
Notes to the Passage 74
Exercises to the Passage 75
Reading Material Program Development（程序的发展） 76
Unit 11 Data Communications（数据通信） 78
Notes to the Passage 80
New Words and Phrases 80
Exercises to the Passage 81
Reading Material Packet-switching Networks（分组交换网） 82
Unit 12 System 1240 Digital Exchange Architecture（S 1240数字交换结构） 85
New Words Phrases and Abbreviations 86
Notes to the Passage 87
Exercises to the Passage 88
Reading Material Digital Switching Network（数字交换网） 90
Unit 13 Purpose of SONET/SDH（SONET/SDH技术） 92
New Words Phrases and Abbreviations 93
Notes to the Passage 94
Exercises to the Passage 94
Reading Material Overview of SDH（SDH技术简介） 96
Unit 14 ISDN（综合业务数字网） 99
New Words Phrases and Abbreviations 100
Notes to the Passage 101
Exercises to the Passage 102
Reading Material Function of Main Memory（主存的功能） 104
Unit 15 Hybrid/Fiber Coax（HFC）（混合光纤／同轴电缆接入技术） 106
New Words Phrases and Abbreviations 107
Notes to the Passage 108
Exercises to the Passage 108
Reading Material Video Conferencing—A Future Way of Communications（未来通信方式—视频会议） 110
Unit 16 LAN and WAN Internetworking（局域网和广域网） 113
New Words Phrases and Abbreviations 114
Notes to the Passage 115
Exercises to the Passage 116
ReadingMaterial Types of Files（文件的分类） 117
Unit 17 The World Wide Web（万维网） 120
New Words Phrases and Abbreviations 121
Notes to the Passage 122
Exercises to the Passage 122
Reading Material The World Wide Web（万维网） 124
Unit 18 TCP/IP（传输控制协议／网际协议） 127
New Words Phrases and Abbreviations 129
Notes to the Passage 130
Exercises to the Passage 131
Reading Material E-mail（电子邮件） 132
Unit 19 IP Telephony（IP电话） 135
New Words Phrases and Abbreviations 137
Notes to the Passage 138
Exercisses to the Passage 139
Reading Material Web Chat（网上聊天） 141
Unit 20 Third-Generation Evolution（第三代移动通信的发展） 144
New Words Phrases and Abbreviations 146
Notes to the Passage 147
Exercises to the Passage 148
Reading Material ATM+MPEG2=Efficient Multimedia（ATM+MPEG2＝高效多媒体） 150
附录一 专业英语的翻译技巧 153
附录二 英语构词法 161
附录三 单词表 171
附录四 词汇短语表 190
附录五 缩略语表 198
参考文献 201