D-Link DWC-1000 [99/368] D link dwc 1000 user manual 99
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D-Link DWC-1000 [99/368] D link dwc 1000 user manual 99

D-Link DWC-1000 [99/368] D link dwc 1000 user manual 99
D-Link DWC-1000 User Manual 99
Section 4 - Advanced WLAN Conguration
Field Description
cwMan (Maximum
Contention Window)
The value specied here in the Maximum Contention Window is the upper limit (in
milliseconds)forthedoublingoftherandombacko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 will continue until a
maximum number of retries allowed is reached.
Valid values for the cwmax are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The value for
cwmax must be higher than the value for cwmin.
Max. Burst Length
APEDCAParameterOnly(TheMax.BurstLengthappliesonlytotracowingfromthe
accesspointtotheclientstation.)Thisvaluespecies(inmilliseconds)theMaximumBurst
Length allowed for packet bursts on the wireless network. A packet burst is a collection
of multiple frames transmitted without header information. The decreased overhead
results in higher throughput and better performance. Valid values for maximum burst
length are 0.0 through 999.
General Parameters
WMM Mode
Wi‐FiMultiMedia(WMM)isenabledbydefault.WithWMMenabled,QoSprioritization
andcoordinationofwirelessmediumaccessison.WithWMMenabled,QoSsettingson
theD‐Linkcontrollercontroldownstreamtracowingfromtheaccesspointtoclient
station(APEDCAparameters)andtheupstreamtracowingfromthestationtothe
accesspoint(stationEDCAparameters).
DisablingWMMdeactivatesQoScontrolofstationEDCAparametersonupstreamtrac
owingfromthestationtotheaccesspoint.WithWMMdisabled,youcanstillsetsome
parametersonthedownstreamtracowingfromtheaccesspointtotheclientstation
(APEDCAparameters).
TodisableWMMextensions,switchOFF.
ToenableWMMextensions,switchON.
Station EDCA Parameters
Queue
Queuesaredenedfordierenttypesofdatatransmittedfromstation‐to‐AP:
• Data0(Voice)—Highestpriorityqueue,minimumdelay.Time‐sensitivedatasuchas
VoIPandstreamingmediaareautomaticallysenttothisqueue.
• Data1(Video)—Highestpriorityqueue,minimumdelay.Time‐sensitivevideodatais
automatically sent to this queue.
•Data2(besteort)—Mediumpriorityqueue,mediumthroughputanddelay.Most
traditionalIPdataissenttothisqueue.
• Data 3 (Background)—Lowest priority queue, high throughput. Bulk data that
requiresmaximumthroughputandisnottime‐sensitiveissenttothisqueue(FTP
data,forexample).
AIDS (Inter-Frame Space)
TheArbitrationInter‐FrameSpacing(AIFS)speciesawaittimefordataframes.Thewait
time is measured in slots. Valid values for AIFS are 1 through 255.
cwMin (Minimum
Contention Window)
Thisparameterisusedbythealgorithmthatdeterminestheinitialrandombackowait
time(window)fordatatransmissionduringaperiodofcontention.
ThevaluespeciedintheMinimumContentionWindowistheupperlimit(inmilliseconds)
ofarangefromwhichtheinitialrandombackowaittimeisdetermined.
The rst random number generated will be a number between 0 and the number
specied here.
Iftherstrandombackowaittimeexpiresbeforethedataframeissent,aretrycounteris
incrementedandtherandombackovalue(window)isdoubled.Doublingwillcontinue
untilthesizeoftherandombackovaluereachesthenumberdenedintheMaximum
Contention Window.

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