Enterasys RoamAbout RBT-4102 - Page 96

Radio Interface
4-60 Advanced Configuration
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