Wi-Fi - Understanding Wi-Fi January 2002 1 Table of...

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Understanding Wi-Fi™ January 2002
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1 Table of Contents Table of Contents . ..................................................................................................................... 1 Executive Summary . ................................................................................................................. 2 Introduction . .............................................................................................................................. 3 Wireless LANs and Wi-Fi™. .................................................................................................... 4 Benefits of Wireless LANs . .................................................................................................. 4 802.11 Basics . ....................................................................................................................... 4 The Evolving 802.11 Standard. ............................................................................................. 5 RF Fundamentals for WLANs . ................................................................................................. 8 Propagation Characteristics Must Be Considered. ................................................................ 8 Data Rate and Range are Related. ......................................................................................... 9 Regulations. ............................................................................................................................... 9 Sharing the Airwaves . ........................................................................................................... 9 Allocated Spectrum. .............................................................................................................. 9 Mandated Use of Spread Spectrum Techniques. ................................................................. 10 Appendix . ................................................................................................................................ 12 Acronyms . ........................................................................................................................... 12 References on the Web. ....................................................................................................... 13
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2 Executive Summary The IEEE 802.11 working group published the 802.11 standard for wireless LANs in 1999. 802.11b is a supplement to 802.11 that specifies a higher data rate and is currently the industry-accepted standard for WLANs. 802.11b products that meet a base standard of interoperability are certified by the Wireless Ethernet Compatibility Alliance (WECA) with the Wi-Fi™ logo. Several IEEE 802.11 working groups are creating standards for improvements in data rates, quality of service, and security. Options for higher data rates will soon be available as 802.11a and 802.11g products begin to appear on the market. The 802.11e working group will be publishing recommendations for adding quality of service features to 802.11 as well.
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Wi-Fi - Understanding Wi-Fi January 2002 1 Table of...

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