Specifications

Radio Interface
4-52 Advanced Configuration
• MulticastDataRatesetsthespeedtosupportformulticasttraffic.
Thefasterthetransmitspeed,theshorterthecoverageareaatthatspeed.Forexample,anAP
withan802.11b11Mbit/sRadioCardcancommunicatewithclientsuptoadistanceof375
feetinasemi‐openenvironment.
However,onlyclientswithinthefirst165feetcan
communicateat11Mbit/s.Clientsbetween165and230feetcommunicateat5.5Mbit/s.
Clientsbetween230and300feetcommunicateat2Mbit/s;andclientsbetween300to375feet
communicateat1Mbit/s.
• BeaconInterval(20‐1000)setsthe
rateatwhichbeaconsignalsaretransmittedfromthe access
point.Thebeaconsignalsallowwirelessclientstomaintaincontactwiththeaccesspoint.
Theymayalsocarrypower‐managementinformation.Default:100Ms
• DataBeaconRate(1‐255)setstherateatwhichstationsinsleepmodemustwakeup
toreceive
broadcast/multicasttransmissions.
KnownalsoastheDeliveryTrafficIndicationMap(DTIM)interval,itindicateshowoftenthe
MAClayerforwardsbroadcast/multicasttraffic,whichisnecessarytowakeupstationsthat
areusingPowerSavemode.Thedefaultvalueof2indicatesthattheaccesspointwillsaveall
broadcast/multicastframesfortheBasicServiceSet(BSS)andforwardthemafterevery
secondbeacon.UsingsmallerDTIMintervalsdeliversbroadcast/multicastframesinamore
timelymanner,causingstationsinPowerSavemodetowakeupmoreoftenanddrainpower
faster.UsinghigherDTIMvaluesreducesthepowerusedby
stationsinPowerSavemode,but
delaysthetransmissionofbroadcast/multicastframes.Range:1‐255beacons;Default:2
beacons
• FragmentLength(256 ‐2346)specifiesanalternativeframelengthforpackets.When
transmittingdataviathewirelessnetwork,yourwirelessnetworkautomaticallysplitsupthe
fileormessageinanumber
ofdifferentpacketsthatarere‐assembledagainbythe
communicationpartner.RoamAboutproductsusestandardIEEE802.11compatibleframe
lengths,wheredifferentlengthsapplyforeachTransmitRate.Fragmentationwillapply
alternative(usuallyshorter)framelengthstosplitandreassemblethewirelessdataframes.
Default:2346.
• RTSThreshold(0‐
2347)setstheRequesttoSend(RTS)thresholdframelengthbetween0and
2,327bytes.YoucanconfiguretheaccesspointtoinitiateanRTSframesequencealways,
never,oronlyonframeslongerthanaspecifiedlength.Ifthepacketsizeissmallerthanthe
presetRTSthresholdsize,the
RTS/CTSmechanismwillNOTbeenabled.
Theaccesspointsendsrequesttosend(RTS)framestoaparticularreceivingstationto
negotiatethesendingofadataframe.AfterreceivinganRTS,thestationsendaCTS(Clearto
Send)frametoacknowledgetherightforthestationtosenddata
frames.Theaccesspoint
contendingforthemediummaynotbeawareofeachother.TheRTS/CTSmechanismcan
solvethisʺHiddenNodeProblemʺ.
IftheRTSthresholdissetto0,theaccesspointneversendsRTSsignals.Ifsetto2347,the
accesspointalwayssendsRTSsignals.
Ifsettoanyothervalue,andthepacketsizeequalsor
exceedstheRTSthreshold,theRTS/CTS(RequesttoSend/CleartoSend)mechanismwillbe
enabled.Range:0‐2347bytes:Default:2347bytes