Intellinet 525688 - Page 65

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Queuesautomaticallyprovideminimumtransmissiondelaysforvideo,voice,
multimediaandcriticalapplications.Thevaluescanfurtherbeadjusted
manually:
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CWMin MinimumContentionWindow(milliseconds):
Thisvalueisinputtotheinitialrandom
backoffwaittimealgorithmforretryofadata
frametransmission.Thebackoffwaittimewill
begeneratedbetween0andthisvalue.Ifthe
frameisnotsent,therandombackoffvalueis
doubleduntilthevalue
reachesthenumber
definedbyCWMax(below).TheCWMinvalue
mustbelowerthantheCWMaxvalue.The
contentionwindowschemehelpstoavoid
framecollisionsanddeterminepriorityof
frametransmission.Ashorterwindowhasa
higherprobability(priority)oftransmission.
CWMax MaximumContentionWindow(milliseconds):
Thisvalueistheupperlimittorandom
backoffvaluedoubling(seeabove).
AIFSN ArbitrationInter‐FrameSpace(milliseconds):
Specifiesadditionaltimebetweenwhena
channelgoesidleandtheAP/clientsends
dataframes.TrafficwithalowerAIFSNvalue
hasahigherpriority.
TxOP TransmissionOpportunity(milliseconds):The
maximumintervaloftimeanAP/clientcan
transmit.Thismakeschannelaccessmore
efficientlyprioritized.Avalueof0meansonly
oneframepertransmission.Agreatervalue
effectshigherpriority.
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