User's Manual

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differentcommunicationprotocols,dataformattingstructures,languages,and/orarchitecture.
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HT mode
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Inthe802.11nsystem,twonewformats,calledHighThroughput(HT),aredefinedforthe
PhysicalLayer,MixedMo de,andGreenField.Ifasystemruns40HT,twoadjacent20MHz
channelsareused.Thelarger40MHzbandwidthcanprovidebettertransmitqualityandspeed.
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K e y s 
Likepasswords,keysopen(decrypt)andclose(encrypt)messages.Whilemanyencryption
algorithmsarecommonlyknownandpublic,thekeymustbekeptsecret.
Local‐AreaNetwork ( L A N ) 
Asmall datanetworkcoveringalimitedarea,suchasabuildingorgroupofbuildings.MostLANs
connectworkstationsorpersonalcomputers.LANsletmanyuserssharedevicessuchasprinters
aswellasdata.LANsalsofacilitatecommunicationthroughe‐mailorchatsessions.
MediaAccessControl(MAC) A dd ress 
Addressassociatedwitheveryhardwaredeviceonthenetwork.Every802.11wirelessdevicehas
itsownspecificMACaddress.Thisuniqueidentifierishard‐codedintothedeviceandcanbe
usedtoprovidesecurityforWLANs.WhenanetworkusesaMACtable,onlythe802.11radios
thathavetheirMACaddressesaddedtothatnetwork'sMACtablecanaccessthenetwork.
NetworkAddressTranslation ( N A T ) 
AnInternetstandardthatletsaLANuseonesetofIPaddressesforinternaltrafficandasecond
setofaddressesforexternaltraffic.
NetworkTimeProtocol ( NT P) 
Aprotocolthatletsdevicessynchronizetheirtimewithatimeserver.NTPusesTCPorUDPport
123bydefault.
Pa ss ph r a se 
AtextstringthatautomaticallygeneratesWEPkeysonwirelessclientadapters.
PowerOverEthernet (P o E ) 
APoEprovidespowertoPoE‐enableddevicesusingan8‐pinCAT5Ethernetcable,eliminatingthe
needforapowersource.
P re a m b l e 
SynchronizestransmissionsinaWLAN.ThepreambletypedefinesthelengthoftheCyclic
RedundancyCheckblockforcommunicationbetweenadeviceandroamingwirelessstations.
Protecte dExtensible Authentication Protocol (P E A P) 
AuthenticationprotocolofIEEE802.1xusedtosendauthenticationdataandpasswordsover
802.11WLANs.
Quality ofService ( Qo S) 
Anetwork’sabilitytodeliverdatawithminimumdelay.QoSalsoreferstothenetworking
methodsusedtoprovidebandwidthforreal‐timemultimediaapplications.
RemoteAuthentication Dial‐InUserService ( R A DI U S) 
Networkingprotocolthatprovidescentralizedauthentication,authorization,andaccounting