Breakthroughs in Telephone Technology

Breakthroughs in Telephone Technology

by Robert Curley

Hardcover

$35.25

Product Details

ISBN-13: 9781615306787
Publisher: Rosen Publishing Group, Incorporated, The
Publication date: 12/15/2011
Series: Computing and Connecting in the 21st Century
Pages: 144
Product dimensions: 6.00(w) x 9.10(h) x 0.50(d)
Age Range: 15 - 17 Years

Table of Contents

Chapter 1 The Development of the Basic Landline Telephone 1

Working Components 2

Power Source 2

Switch Hook 3

Dialer 4

Ringer 4

Transmitter 5

Receiver 7

Anti-Sidetone Circuit 7

Early Sound Transmitters 8

Johann Reis's "Philosophical Toys" 10

Gray and Bell's Race for a Patent 11

The Search for a Successful Transmitter 13

Alexander Graham Bell 14

Thomas Augustus Watson 16

From Hand-Cranked to Cordless: 100 Years of AT&T Telephones 17

Western Electric 18

Chapter 2 The Development of the Public Switched Telephone Network 21

Switching 22

Manual Switching 23

Electromechanical Switching 24

Electronic Switching 25

Digital Switching 26

The Switching Network 27

Signaling 29

Rotary Dialing 30

Push-Button Dialing 31

Interoffice Signaling 32

Transmission 34

From Single-Wire to Two-Wire Circuits 34

Problems of Interference and Attenuation 35

Analog and Digital Transmission 36

DSL 37

Coaxial Cable 38

Microwave Link 38

Optical-Fibre Cable 40

Terrestrial Radio 41

Undersea Cable 42

Satellite 43

Chapter 3 The Principles of Telecommunications Systems 45

Analog-to-Digital Conversion 46

Sampling 48

Quantization 49

Harry Nyquist 50

Bit Mapping 51

Source Encoding 52

Huffman Codes 53

The Lempel-Ziv Algorithm 54

Run-Length Codes 55

Channel Encoding 56

Repetition Codes 57

The Hamming Code 57

Convolutional Encoding 58

Modulation 59

Amplitude Modulation and Frequency Modulation 61

Digital Modulation 61

Multiplexing 64

Frequency-Division Multiplexing 64

Time-Division Multiplexing 66

Multiple Access 68

Frequency-Division Multiple Access 68

Time-Division Multiple Access 69

Code-Division Multiple Access 69

Chapter 4 Faxes and Modems 71

The Fax 71

Standard Fax Transmission 71

History of Fax Technology 74

Bits and Bytes 79

The Modem 80

Development of Voiceband Modems 81

Voiceband Modem Operating Standards 83

Cable Modems 88

DSL Modems 90

Chapter 5 Mobile Phones, Videophones, and Internet Phones 93

The Cell Phone 94

Cellular Communication 95

Development of Cellular Systems 97

CUL8R: Texting 102

The Smartphone 103

The Satellite Phone 105

The iPhone 106

The Videophone 109

Early Videophones 110

Analog Videophones 111

Digital Videophone Systems 112

Videoconferencing 113

VoIP 114

Conclusion 117

Glossary 118

Bibliography 120

Index 122

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