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Unit 1 Telephony 1

Reading and Translating 1

Reading A The Story of Telephone 1

Reading B Telephone Traffic 5

Simulated Writing 8

Listening and Speaking 11

Unit 2 Switching Technology 12

Reading and Translating 12

Reading A PBX Functions 12

Reading B ATM:The Future of LANs 18

Simulated Writing 21

Listening and Speaking 23

Unit 3 Computer Networks 24

Reading and Translating 24

Reading A Computer Networks 24

Reading B Virtual LANs 28

Simulated Writing 31

Listening and Speaking 33

Unit 4 Internet 34

Reading and Translating 34

Reading A Internet 34

Reading B Introduction to ISDN 39

Simulated Writing 42

Listening and Speaking 44

Unit 5 Integration 45

Reading and Translating 45

Reading A Computer-Telephone Integration 45

Reading B Multimedia Networking 50

Simulated Writing 53

Listening and Speaking 54

Unit 6 Satellite Communication 55

Reading and Translating 55

Reading A Communication Satellite System 55

Reading B The History of Iridium 59

Simulated Writing 61

Listening and Speaking 62

Unit 7 Wireless Communication 64

Reading and Translating 64

Reading A Cellular Mobile Telephone 64

Reading B WAP 68

Simulated Writing 71

Listening and Speaking 72

Unit 8 Optical and Microwave Communication 74

Reading and Translating 74

Reading A Optical Fiber Communication 74

Reading B Microwave Radio Communication 78

Simulated Writing 81

Listening and Speaking 82

Unit 9 Posts 84

Reading and Translating 84

Reading A The Universal Postal Union 84

Reading B EMS 88

Simulated Writing 91

Listening and Speaking 94

Unit 10 Power Supply 95

Reading and Translating 95

Reading A Power Supply for Modern Telecommunication Equipment 95

Reading B Five Personal UPS's 100

Simulated Writing 103

Listening and Speaking 103

Vocabulary 105

Phrases and Expresions 116