Information and Security
Information and Security
Information and Security
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802.11Developed in 19892.4 Ghz using DSSS or FHSS1 - 2 Mbps, 300 foot range802.11bMost PopularDSSS1, 2, 5.5, 11 MbpsWEP 40 (64) <strong>and</strong> 128 encryption802.11b Channels802.11b applies to wireless LANs <strong>and</strong>provides 11 Mbps transmission (with afallback to 5.5, 2 <strong>and</strong> 1 Mbps dependingon Range <strong>and</strong> Signal Strength) in the2.4 GHz b<strong>and</strong>. 802.11b uses only DSSS(Acronym for direct-sequence spreadspectrum. DSSS is one of two types ofspread spectrum radio.) 802.11b was a1999 IEEE ratification to the original802.11 st<strong>and</strong>ard.http://www.research.umbc.edu/~dgorin1/451/wlan/wlan.htmWireless Channels802.11b PerformanceSpeed vs. Distance802.11a5 Ghz UNII B<strong>and</strong>s6,9,12,16,18,24,36,48,<strong>and</strong> 54MbpsRate Doubling TechnologyNot backwards compatibleDual Frequency WAPShorter Range (25-75 feet)More WAPsMore Expensive802.11g2.4 GhzUp to 54MbpsRate Doubling TechnologyBackwards compatible w/802.11bRange up to 300 feetMidrange CostsNot compatible with 802.11aComparisonAd-HocStations interact with each other
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