Next-Generation Modems: A Professional Guide to DSL and Cable Modems

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A comparative guide to the technologies, capabilities, and costs of next-generation desktop connectivity With the advent of cable modems and Digital Subscriber Lines (DSLs), modem technology has entered a new and highly sophisticated realm that is light-years beyond PC modems. Integrating and interoperating at high transmission levels with telephone and cable broadcast infrastructure to allow for faster, clearer transmission of data-intensive Web pages, DSLs and cable modems are competing for attention in this ...
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Overview

A comparative guide to the technologies, capabilities, and costs of next-generation desktop connectivity With the advent of cable modems and Digital Subscriber Lines (DSLs), modem technology has entered a new and highly sophisticated realm that is light-years beyond PC modems. Integrating and interoperating at high transmission levels with telephone and cable broadcast infrastructure to allow for faster, clearer transmission of data-intensive Web pages, DSLs and cable modems are competing for attention in this massive emerging market. For network managers, LAN administrators, and corporate planners charged with purchasing, installing, and troubleshooting last-mile technology for their organizations, Gilbert Held details what you'll need to know to make informed choices for the future. Offering simple explanations and in-depth comparisons, this book considers the whole range of strategic, technical, and investment concerns, from cost analysis and bandwidth limitations to suitability for various business and residential applications. Held discusses why a new generation of modems is needed and why those modems require a different infrastructure from those that transmit data over the PSTN. The fundamentals of DSLs are presented along with a look at how cable modems operate. And a comprehensive comparison of DSL and cable modem technology is provided that covers their advantages and disadvantages as well as their potential use for business and residential subscribers.
This book contains everything you'll need to know about next- generation modems including:
*Information on how infrastructure and content variables map to Web wait time
*Transmission fundamentals forcurrentmodem operations
*Discussions on how different types of DSLs overcome bandwidth limitations
*A survey of the DSL family
*A tutorial in the cable TV infrastructure
*Coverage of the cable modem standard
*Comparative analysis of costs, throughput, and suitability for various applications
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Product Details

  • ISBN-13: 9780471359814
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 2/17/2000
  • Edition number: 1
  • Pages: 224
  • Product dimensions: 7.51 (w) x 9.18 (h) x 0.54 (d)

Table of Contents

Preface xi
Acknowledgments xiii
Chapter 1 The Need for Speed 1
Rationale for Breaking the Speed Barrier 2
Operating Rates versus Transmission Requirements 2
Legacy Transmission Requirements 2
Modern Transmission Requirements 3
Modem Bottleneck 6
Book Preview 10
Transmission Fundamentals 10
Digital Subscriber Line Fundamentals 10
G.lite 11
Cable TV Infrastructure 11
Cable Modem 11
Battle for Business and Residential Subscribers 11
Chapter 2 Transmission Fundamentals 13
Telephone Company Infrastructure 14
Central or End Office 14
Operation 15
Local Loop 16
Infrastructure Limitations 16
Backbone Infrastructure 16
Local Loop Constraints 18
Carrier Signal Strength 22
Frequency Limits 27
Attenuation Compensation 27
Delay Distortion 27
Delay Compensation 29
Phase Jitter 31
Modem Components and the Modulation Process 33
Modem Components 34
Modem Transmitter Section 34
Scramblers 37
Modulator, Amplifier, and Filter 38
Modulation Process 38
Amplitude Modulation 39
Frequency Modulation 40
Phase Modulation 42
Bps versus Baud 43
Spatial Representation 45
Combined Modulation Techniques 46
Constellation Pattern 50
Trellis Coding 53
Echo Cancellation 56
Chapter 3 Digital Subscriber Line Fundamentals 59
Copper-based Local Loop 60
Connection Methods 60
Loop Distance Considerations 61
Loading Coils 62
Bridged Taps 62
Digital Subscriber Line Family 62
Overview 63
Downstream and Upstream Operations 65
Splitter Considerations 65
Standards 68
HDSL 68
Conventional Digital Local Loop 69
Repeater Requirements 69
HDSL Evolution 71
2B1Q Coding 72
2B1Q-based HDSL 73
Equipment 73
Error Rate 76
Applications 77
HDSL 2 77
Terminology 77
Operation 77
SDSL 78
Operation 79
Crosstalk and Span Distance 79
ADSL 79
Rationale 80
Frequency Utilization 81
Line Coding 82
DMT 83
ANSI Modem Operation 85
CAP 86
Operating Rate Considerations 87
Applications 87
Application Suitability 89
RADSL 90
Evolution 90
Operational Examples 91
Applications 94
IDSL 94
Advantages 95
Applications 95
CDSL 95
Rational and Evolution 95
Comparison to ADSL and RADSL 96
G.lite 97
Goal 97
VDSL 98
Development Orientation 98
Fiber to the Home 98
Hybrid Fiber/Coax 98
Fiber to the Neighborhood 99
Technology 99
Frequency Division Multiplexing 101
Data Rate Support 101
VDSL Networking 103
Standards 105
Commercial Offerings 105
MVL 106
Overview 106
Access Capability 106
Technology 107
MVL System 107
Troubleshooting 108
Testing and Troubleshooting 110
Testing Considerations 110
Fluke xDSL OneTouch 112
Operation 112
Utilization 114
Chapter 4 G.lite 115
Overview 116
ADSL Splitter Requirements 116
Splitterless Tradeoffs 118
Power Reduction 118
Nonlinear Telephone Operations 118
Splitterless Operation 120
Splittered Installation Options 120
G.lite Standard 122
Accelerated Timeline 122
Use of DMT 123
Operating Rate and Drive Distance 123
Retraining 124
Understanding Always-On 125
Representative Products 125
Chapter 5 The Cable TV Infrastructure 129
Basic Cable TV Network 130
Headend 130
Bandwidth Allocation 130
TV Channels 131
Broadcast Bands 131
Cable TV Distribution Infrastructure 135
Amplifier Operations 135
Splitters 136
Logical Cable TV Architecture 138
Evolving Cable TV Infrastructure 139
Field Trials 139
Hybrid Fiber/Coax Systems 140
Emerging Cable TV Distribution System 141
On-Air Frequencies 142
Comparing Cable and Telephone Infrastructures 142
CATV Cabling 147
Chapter 6 The Cable Modem 151
Overview 151
Hybrid Product Development 152
Need for Standardization 152
A Tale of Two Standards 152
DOCSIS versus IEEE 153
Connectivity 154
Physical Cabling 154
Dual Modem Operation 156
Wiring Hub Support 156
Hub Restrictions 158
DOCSIS Specification 159
Upstream Operations 161
Downstream Operations 164
Access Control 164
Framing 165
Operation 166
Using the Motorola CyberSURFR 167
Installation 167
Overview 167
Operation 167
Initial Registration 168
PC Configuration 168
Using LEDs 169
Troubleshooting 169
Using Ping 171
Using Tracert 175
Using Netstat 175
Chapter 7 The Battle for Business and Residential Subscribers 181
Selection Factors 182
Availability 182
Cost 183
Throughput 184
Application Considerations 184
Voice Over DSL 185
Virtual Private Networking 186
Security 186
The Future 187
DSL 187
Cable 188
Glossary 191
Index 197
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