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D-Link DWS-4026 [609/741] Access point profile tspec configuration

ConfiguringAdvancedSettings

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page609

D‐LinkUWSUserManual

CommandButtons

Thepageincludesthefollowingbuttons:

• Submit—Updatestheswitchwiththevaluesyouenter.Toretainthenewvaluesacrossapowercycle,you

mustperformasave(Tool>SaveChanges).

• Refresh—Updatesthepagewiththelatestinformation.

AccessPointProfileTSPECConfiguration

FromtheAccessPointProfileTSPECConfigurationpage,youcanconfiguretrafficspecification(TSPEC)

settingsfortheaccesspointsthatusethisprofile.

TSPECincorporatesQoSfeaturesintothewirelessnetworktohelpwirelessclientsmakesuretime‐anddelay‐

sensitivenetworktraffic,suchasvideoandvoice,havepriorityoveroth

ertypeoftr affic.Examplesofwireless

clientsthatmightusethisfeatureincludeaWi‐FiCertifiedtelephonehandsetthatmarksitscodec‐generated

datapacketsasvoiceprioritytraffic,oravideoplayerapplicationonawirelesslaptopthatprioritizesavideo

conferencefeedfromacorporateserver.

Configurethese

ttingsontheAccessPointProfileTSPECConfigurationpagetodeterminehowanAPhandles

theTSPECsentfromaQoS‐capablewirelessclient.

cwMin

(MinimumContention

Window)

Thisparameterisusedbythealgorithmthatdeterminestheinitialrandom

backoffwaittime(window)fordatatransmissionduringaperiodofco

ntention

for

ThevaluespecifiedintheMinimumContentionWindowistheupperlimit(in

milliseconds)ofarangefromwhichtheinitialrandombackoffwaittimeis

determined.

Thefirstrandomnumbergeneratedwillbeanumberbetween0andthe

numberspecifiedhere.

Ifthefirstrandombackoffwa

ittimeexpiresbeforethedataframeissent,a

retrycounterisincrementedandtherandombackoffvalue(window)is

doubled.Doublingwillcontinueuntilthesizeoftherandombackoffvalue

reachesthenumberdefinedintheMaximumContentionWindow.

cwMax

(MaximumContention

Window)

ThevaluespecifiedintheMaximumContentionWindowistheupperlimit(in

lliseconds)forthedoubling oftherandombackoffvalue.Thisdoubling

continuesuntileitherthedataframeissentortheMaximumContention

Windowsizeisreached.

OncetheMaximumContentionWindowsizeisreached,retrieswi ll continue

untilamaximumnumberofr

etriesallowedisreached.

TXOPLimit StationEDCAParameterOnly(TheTXOPLimitappliesonlytotrafficflowing

fromtheclientstationtotheaccesspoint.)

TheTransmissionOpportunity(TXOP)isanin tervaloftimewhenaWMEclient

stationhastherighttoinitiatetransmissionsontothewirelessmedium(WM).

Thisvaluespecifie

s(inmilliseconds)theTransmissionOpportunity(TXOP)for

clientstations;thatis,theintervaloftimewhenaWMMclientstationhasthe

righttoinitiatetransmissionsonthewirelessnetwork.

Table355:QoSSettings(Cont.)

Field Description

D-Link DWS-4026 [609/741] Access point profile tspec configuration

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