数据通信好书------UNDERSTANDING DATA COMMUNICATIONS

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书名：UNDERSTANDING DATA COMMUNICATIONS-----From Fundamentals to Networking
版本：Third Edition（2000）
作者：Gilbert Held----4-Degree Consulting Macon, Georgia, USA
出版社：JOHN WILEY & SONS, LTD
PDF超清晰版，共859页
Preface
Acknowledgements xxi
1 Communications in a Modern Society 1
1.1 Applications 1
1.1.1 Data collection 2
1.1.2 Transaction processing 3
1.1.3 Conversational time sharing 5
1.1.4 Remote job entry 7
1.1.5 Message switching 7
1.1.6 Value-added carriers and electronic mail 8
1.1.7 Office automation 12
1.1.8 Electronic commerce 14
1.1.9 Satellite transmission 16
1.2 Constraints 16
1.2.1 Throughput 17
1.2.2 Response time 18
1.2.3 Bandwidth 18
1.2.4 Economics 19
1.3 Emerging Trends 19
1.4 ReviewQuestion s 20
2 Basic Telegraph and Telephone Operations 23
2.1 Evolution of Communications 23
2.2 Telegraphy 24
2.2.1 Operation 24
2.2.2 Morse code 26
2.2.3 Morse code limitations 27
2.2.4 Start–stop signaling and the Baudot code 28
2.2.5 Bits and codes 29
2.3 Telephony 32
2.3.1 Principle of operation 32
2.3.2 Sound wave conversion 34
2.3.3 The basic telephone connection 36
2.3.4 Switchboards and central offices 37
2.3.5 Numbering plans 39
2.3.6 Geographic calling areas and network routing 40
2.3.7 The world numbering plan 43
2.4 ReviewQuestion s 43
Understanding Data Communications: From Fundamentals to Networking.
Third Edition Gilbert Held
Copyright # 2000 John Wiley & Sons Ltd
Print ISBN 0-471-627453 Online ISBN 0-470-84148-6
3Basic Circuit Parameters, Measurement Units and
Media Overview 47
3.1 Basic Circuit Parameters 47
3.1.1 Frequency and bandwidth 47
3.1.2 The telephone channel passband 49
3.2 Measurement Units 50
3.2.1 Power ratios 50
3.2.2 Signal-to-noise ratio 52
3.2.3 Reference points 54
3.3 Media Overview56
3.3.1 Twisted-pair cable 56
3.3.2 Coaxial cable 61
3.3.3 Microwave 63
3.3.4 Fiber-optic transmission 64
3.4 Channel Capacity 67
3.4.1 Bit versus baud 67
3.4.2 Nyquist relationship 67
3.4.3 Shannon’s law68
3.5 Structured Wiring 69
3.5.1 The wiring closet 69
3.5.2 The EIA/TIA-568 standard 69
3.6 ReviewQue stions 72
4 Fundamental Data Transmission Concepts 75
4.1 Analog Line Connections 75
4.1.1 The analog switched line 76
4.1.2 Analog leased line 79
4.1.3 Dedicated line 82
4.1.4 Switched network vs leased line economics 83
4.2 Types of Service and Transmission Devices 84
4.2.1 Digital repeaters 85
4.2.2 Modems 86
4.2.3 Acoustic couplers 87
4.2.4 Analog facilities 89
4.2.5 Digital facilities 93
4.2.6 Digital signaling 93
4.2.7 Representative AT&T digital offerings 96
4.3 Transmission Mode 98
4.3.1 Simplex transmission 98
4.3.2 Half-duplex transmission 99
4.3.3 Full-duplex transmission 100
4.3.4 Terminal and mainframe computer operating modes 101
4.4 Transmission Techniques 103
4.4.1 Asynchronous transmission 103
4.4.2 Synchronous transmission 105
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Synchronous transmission 105