User's Manual

9

2‐3Glossary
1. WhatistheIEEE802.11gstandard?
802.11gisthenewIEEEstandardforhigh‐speedwireless
LANcommunicationsthatprovidesforupto54Mbpsdataratein
the2.4GHzband.802.11gisquicklybecomingthenextmainstream
wirelessLANtechnologyforthehome,officeand
publicnetworks.
802.11gdefinestheuseofthesameOFDMmodulationtechnique
specifiedinIEEE802.11aforthe5GHzfrequencybandandapplies
itinthesame2.4GHzfrequencybandasIEEE802.11b.The802.11g
standardrequiresbackwardcompatibilitywith802.11b.

Thestandardspecificallycallsfor:
A. Anew
physicallayerforthe802.11MediumAccessControl(MAC)
inthe2.4GHzfrequencyband,knownastheextendedratePHY
(ERP).TheERPaddsOFDMasamandatorynewcodingscheme
for6,12and24Mbps(mandatoryspeeds),and18,36,48and54
Mbps(optionalspeeds).The
ERPincludesthemodulation
schemesfoundin802.11bincludingCCKfor11and5.5Mbps
andBarkercodemodulationfor2and1Mbps.
B. AprotectionmechanismcalledRTS/CTSthatgovernshow
802.11gdevicesand802.11bdevicesinteroperate.

2. WhatistheIEEE802.11bstandard?
TheIEEE802.11bWirelessLANstandardsubcommittee,which
formulatesthestandardforthe industry.Theobjectiveistoenable
wirelessLANhardwarefromdifferentmanufactures
tocommunicate.

3. WhatdoesIEEE802.11featuresupport?
TheproductsupportsthefollowingIEEE 802.11functions:
 CSMA/CAplusAcknowledgeProtocol
 Multi‐ChannelRoaming
 AutomaticRateSelection
 RTS/CTSFeature
 Fragmentation
 PowerManagement
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4. WhatisAd‐hoc?
AnAd‐hocintegratedwirelessLANisagroupofcomputers,each
hasaWirelessLANmodule,Connectedasanindependentwireless
LAN.AdhocwirelessLANisapplicableatadepartmentalscalefora