Preface | p. xv |
Acknowledgments | p. xvii |
Introduction to Wireless LANs | p. 1 |
Overview | p. 3 |
Operation | p. 3 |
Network Configurations | p. 4 |
Roaming | p. 6 |
Extension Points | p. 6 |
Communications Methods | p. 8 |
Infrared | p. 8 |
Microwave | p. 9 |
Radio Frequency | p. 9 |
Benefits | p. 11 |
Utilization | p. 11 |
Hospital Use | p. 12 |
College Use | p. 13 |
Inventory Control | p. 13 |
Internet Access | p. 14 |
Training Centers | p. 14 |
Facilitating Networking | p. 15 |
Trade Show Use | p. 15 |
Benefits | p. 16 |
Constraints | p. 17 |
Book Preview | p. 18 |
Terminology and Technology | p. 19 |
Understanding Wireless LAN Modulation | p. 19 |
Understanding Wireless LAN Communications Systems | p. 20 |
Wireless LAN Hardware | p. 20 |
IEEE Wireless LAN Standards | p. 21 |
Installing a Wireless LAN | p. 22 |
The Home RF Standard | p. 22 |
The Future | p. 22 |
Terminology and Technology | p. 23 |
Basic Communications Concepts | p. 24 |
Powers of Ten | p. 25 |
Frequency | p. 26 |
Wavelength | p. 27 |
The Frequency Spectrum | p. 29 |
Bandwidth | p. 32 |
Power Measurements | p. 32 |
Signal-to-Noise Ratio | p. 37 |
Transmission Rate Constraints | p. 41 |
Nyquist Relationship | p. 42 |
Radio Frequency Spectrum Allocation | p. 45 |
U.S. Spectrum Allocation | p. 46 |
Applications | p. 49 |
Other Transmission Impairments | p. 50 |
Basic Wireless LAN Components | p. 51 |
Path Loss | p. 52 |
Multipath Propagation | p. 56 |
Fading | p. 57 |
Enhancing Signal Reception | p. 58 |
Understanding Wireless LAN Modulation | p. 61 |
Basic Modulation Methods | p. 62 |
Rationale | p. 62 |
Modulation Process | p. 63 |
Amplitude Modulation | p. 64 |
Frequency Modulation | p. 65 |
Phase Modulation | p. 67 |
Wireless LAN Modulation Methods | p. 74 |
DSSS Modulation | p. 75 |
Differential Binary Phase Shift Keying (DBPSK) | p. 75 |
Differential Quadrature Phase Shift Keying (DQPSK) | p. 76 |
Complementary Code Keying (CCK) QPSK | p. 78 |
Frequency Hopping Spread Spectrum (FHSS) Modulation | p. 79 |
Gaussian Frequency Shift Keying (GFSK) | p. 79 |
Orthogonal Frequency Division Multiplexing (OFDM) Modulation | p. 80 |
Quadrature Amplitude Modulation (QAM) | p. 82 |
Wireless LAN Communications Systems | p. 85 |
Spread Spectrum Communications | p. 86 |
Development Rationale | p. 86 |
General Operation | p. 87 |
Spread-Spectrum Methods | p. 88 |
Direct Sequence Spread Spectrum (DSSS) | p. 89 |
Frequency Hopping Spread Spectrum | p. 91 |
Regulations | p. 91 |
Operational Parameters | p. 93 |
Packet Transmission Capability | p. 94 |
Hopping Modes | p. 94 |
Advantages of Use | p. 95 |
Direct Sequence Spread Spectrum | p. 97 |
Regulation | p. 97 |
Operation | p. 98 |
Using the Chipping Code | p. 99 |
Bandwidth Spreading | p. 100 |
Advantages of Use | p. 101 |
Disadvantages | p. 102 |
Coded Orthogonal Frequency Division Multiplexing | p. 103 |
Evolution | p. 103 |
Overview | p. 105 |
Operation | p. 107 |
Scrambling and Coding | p. 108 |
Advantages of Use | p. 110 |
Disadvantages | p. 110 |
Wireless LAN Hardware | p. 113 |
Wireless Access Point | p. 114 |
Evolution | p. 115 |
Equipment Connection | p. 115 |
Using a Single Access Point | p. 117 |
Using Multiple Access Points | p. 118 |
Wireless LAN Network Cards | p. 123 |
Wireless Bridges | p. 127 |
Wireless Router/Gateway | p. 136 |
IEEE Wireless LAN Standards | p. 145 |
The 802.11 Standards | p. 146 |
Overview | p. 147 |
Topology | p. 148 |
Portals | p. 152 |
The Physical Layer | p. 152 |
Modulation | p. 154 |
Frame Format | p. 155 |
Hopping Sequence | p. 156 |
Direct Sequence Spread Spectrum | p. 157 |
Overview | p. 157 |
Modulation | p. 157 |
Frequency Allocation | p. 158 |
Frame Format | p. 158 |
Infrared | p. 159 |
Modulation | p. 160 |
Frame Format | p. 161 |
The MAC Layer | p. 162 |
Basic Access Method | p. 162 |
Minimizing Collisions | p. 163 |
Interframe Spaces | p. 166 |
Collision Avoidance | p. 167 |
Frame Types | p. 167 |
RTS Frame | p. 177 |
CTS Frame | p. 177 |
ACK Frame | p. 178 |
Operation | p. 179 |
Joining an Existing Cell | p. 179 |
Authentication and Association | p. 180 |
Roaming | p. 180 |
The 802.11b Standard Extension | p. 182 |
Overview | p. 183 |
Operation | p. 183 |
Modulation | p. 183 |
The IEEE 802.11a Standard Extension | p. 190 |
Overview | p. 190 |
Modulation | p. 191 |
Frame Format | p. 191 |
Operation | p. 193 |
Installing a Wireless LAN | p. 195 |
The SMC Networks Barricade Router | p. 196 |
Product Overview | p. 196 |
Features | p. 197 |
Site Location | p. 198 |
Wireless Positioning | p. 198 |
Connectivity Tradeoffs | p. 199 |
Using WINIPCFG | p. 200 |
Software Setup | p. 202 |
Verifying Computer--Router Connectivity | p. 203 |
Configuring the Router | p. 204 |
Configuration Options | p. 205 |
Wireless Settings | p. 216 |
Return to WINIPCFG | p. 217 |
The SMC Networks EZ Connect PC Card | p. 218 |
Driver Installation | p. 219 |
Configuration Utility | p. 222 |
Agere Systems Orinoco PC Card | p. 227 |
Installation | p. 227 |
The Client Manager | p. 232 |
Proof of the Pudding | p. 234 |
The Home RF Standard | p. 237 |
Overview | p. 238 |
Versions | p. 239 |
Network Architecture | p. 240 |
Nodes | p. 240 |
System Requirements | p. 241 |
Technical Characteristics | p. 241 |
FHSS Use | p. 241 |
Power, Operating Rate, and Modulation | p. 242 |
Device Support | p. 242 |
Security | p. 243 |
Data Compression | p. 244 |
Home RF Operation | p. 244 |
The Physical Layer | p. 245 |
The MAC Layer | p. 245 |
Frame Duration and Types | p. 246 |
Frame Operations | p. 247 |
The Future | p. 251 |
FCC Part 15 Ruling | p. 252 |
Overview | p. 252 |
ISM Band Use | p. 253 |
RF Interference | p. 254 |
The IEEE 802.11g Standard | p. 255 |
Backward Compatibility Issues | p. 256 |
Area of Coverage Consideration | p. 257 |
The IEEE 802.1x Standard | p. 257 |
Overview | p. 258 |
Operation | p. 258 |
Great Expectations | p. 260 |
AiroPeek, A Wireless Protocol Analyzer | p. 260 |
Overview | p. 261 |
Capturing Traffic | p. 262 |
Protocol Summary | p. 264 |
Packet Decoding | p. 265 |
Hardware Manufacturers | p. 267 |
Locating Wireless Equipment on eBay | p. 271 |
Equipment Location | p. 272 |
The Bidding Process | p. 277 |
Wireless LAN Economics | p. 279 |
Limited Client-Based Wireless LAN | p. 280 |
Access Point/Router-Based Wireless LAN | p. 282 |
Wired LAN Access | p. 283 |
Practical Communications Security | p. 285 |
Glossary | p. 289 |
Index | p. 303 |
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