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1、Presentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.1NewTechnologiesforWirelessLANsBruceAlexanderCiscoAironetWirelessNetworkingBusinessUnitSessionNumberPresentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.2TheProductivityParadoxWhyisitthattheonlylocation
2、whereemployeeshaveaccesstoalltheirproductivitytools......istheonelocationwheretheyspendtheleastamountoftime—theirdesksACC-2315059_04_2002_c1Presentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.©2002,CiscoSystems,Inc.Allrightsreserved.3Technologythatisavailab
3、leTODAYcanhelpyoubuildaWLANthatwillcontinuetoworkforTOMORROW.Presentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.4SeminarOverview•WLANTechnologies•802.11a,802.11b,802.11h,and802.11g•Whentousewhattechnology•Comparing802.11aand802.11b•Combiningtechnologies•Se
4、curity(QuickUpdate)Presentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.5WirelessTechnologiesWAN(WideAreaNetwork)MAN(MetropolitanAreaNetwork)LAN(LocalAreaNetwork)PAN(PersonalAreaNetwork)PANLANMANWAN802.11a,11b,11g802.11GSM,GPRS,StandardsBluetoothHiperLAN2MMD
5、S,LMDSCDMA,2.5-3GSpeed<1Mbps2to54+Mbps22+Mbps10to384KbpsRangeShortMediumMedium-LongLongPDAs,MobilePeer-to-PeerEnterpriseFixed,lastmileApplicationsPhones,cellularDevice-to-DevicenetworksaccessaccessPresentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.6Wireles
6、sLANTechnologies802.11b802.11a802.11gFrequency2.4GHz5GHz2.4GHzBandAvailabilityWorldwideUS/APWorldwide11MbpsMaximum54Mbps54MbpsDataRateTheLawsofRadioDynamics:Higherdatarates=shortertransmissionrangeHigherpoweroutput=increasedrange,butlowerbatterylifeHigherfreque
7、ncyradios=higherdatarates,shorterrangesPresentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.7802.11a•RatifiedasStandardinSeptember,1999•ProvidessimilartechnologytoHylerLAN2•Dataratesto54Mbdefined•Provides8indoorWLANchannel•Regulationdifferextensivelyacrossco
8、untriesPresentation_ID©2001,CiscoSystems,Inc.Allrightsreserved.8802.11aIssues•8channels(UNII1andUNII2combined)Maynotbeabletouseadjacentchannelsinadjacentcellsduetosidebands•
