WiFi及WLAN基础知识(专业英语)[培训]

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1、WhatisWLAN?Thetermwirelessmeansanytechnologywhichisusedwithoutanvhardwiredconnection,suchasBluetooth,GSM/GPRS,and3G.Amongall,thewirelesstechnologybroadlyreferstotheWLAN,asis“WirelessLocalAreaNetwork：whichlinksmorethantwodeviceswithoutentanglingwires.Thewirelessnetworkenablesyoutosurftheinternet

2、anywhereinthehouse・YoucansaveboththecostofextraEthernetcablesandtimestosetupthenetwork.AllyouneedtodoisinstalltheadapterandupgradeyourPCintothewirelessnetwork;youcanthenenjoythebenefitofit.WhatisWi-Fi?TheTerm“Wi・Fi”，asshortfor”WirelessFidelity”,isinventedbytheWi・FiAlliance,whichisintendedtoimpr

3、ovetheinteroperabilityofwirelesslocalareanetworkproducts.“Wi・Fi”wasoriginallyreferringtotheWi-FiAllianceandtheWi-FiCertificationapplicableonlyto802.11bstandard.TodayitisbroadlyreferringtoanyoftheIEEE802.11WLANStandards,including802.11b,802.11a,802.11g,andthelatest802.11nstandards.(SeeWhatareWLA

4、Nstandards?)Wi-FiAllianceandWi-FiCertifiedTheWi-FiAllianeeisanonprofitinternationalassociationtocertifyasetofinteroperableWLANproductsbasedontheIEEE802.11standards・ManufacturersthataremembersofWi-FiAllianceandwhoseproductspasstheinteroperabilitytestsholdbytheWi-FiAlliancewillbeapprovedas“Wi-FiC

5、ertified"andcanmarktheirproductswiththeWi-Filogo.MeanwhileauserwhocarriesaflWi-FiCertifiedHproductcanuseanybrandofaccesspointwithanyotherbrandofclienthardwarethatalsoiscertified.WhatareWLANstandards?WLANStandardsisalsoknownastheIEEE802.11technologiesdevelopedbytheIEEE(InstituteofElectricalandEl

6、ectronicsEngineers,Inc),whichspecifiesanover・the・airinterfacebetweentheclientandbasestationortwowirelessclients.Accordingtodifferentencryptionanddatarate,IEEE802.11technologiesmainlyconsistof802.11b,802.11a,802.11g,and802.11n.802.11bThe802.11bspecificationwasthefirstwidelyacceptedwirelessnetwor

7、kingstandard.Itoperatesinthe2.4GHzISMband,andhasamaximumspeedof11Mbpswithintherangeupto50meters.Since802.11boperatesatthefrequencyof2.4GHzasthecommonchannelfrequency,itcanbeinterferedwithobstacleslikemicrowaveorcordlessphones.802.