D-Link DWL-6600AP User Manual download pdf (Page 61)

ModifyingRadioSettings

D-Link UnifiedAccessPointAdministrator’sGuide

November2011 Page61

UnifiedAccessPointAdministrator’sGuide

Channel SelecttheChannel.

Therangeofavailablechannelsisdeterminedbythemodeoftheradiointerfaceandthe

countrycodesetting.IfyouselectAutoforthechannelsetting,theAPscansavailable

channelsandselectsachannelwherenotrafficisdetected.

Thechanneldefinestheportionof

theradiospectrumtheradiousesfortransmittingand

receiving.Eachmodeoffersanumberofchannels,dependingonhowthespectrumis

licensedbynationalandtransnational authoritiessuchastheFederalCommunications

Commission(FCC)ortheInternationalTelecommunicationUnion(ITU‐R).

Whenautomaticchannelassignmentisenabledonthe

ChannelManagementpagefor

Clustering,thechannelpolicyfortheradioisautomaticallysettostaticmode,andthe

AutooptionisnotavailablefortheChannelfield.Thisallowstheautomaticchannel

featuretosetthechannelsfortheradiosinthecluster.

ChannelBandwidth

(802.11nmodes

only)

The802.11nspecification

allowsa40‐MHz‐widechannelinadditiontothelegacy20‐

MHzchannelavailablewith othermodes.The40‐MHzchannelenableshigherdatarates

butleavesfewerchannelsavailableforusebyother2.4GHzand5GHzdevices.

Setthefieldto20‐MHztorestrictthe

useofthechannelbandwidthtoa20‐MHz

channel.

PrimaryChannel

(802.11nmodes

only)

Thissettingcanbechangedonlywhenthechannelbandwidthissetto40MHz.A40‐

MHzchannelcanbeconsideredtoconsistoftwo20‐MHzchannelsthatarecontiguous

inthefrequencydomain.These

two20‐MHzchannelsareoftenreferredtoasthe

PrimaryandSecondarychannels. ThePrimaryChannelisusedfor802.11nclientsthat

supportonlya20‐MHzchannelbandwidthandforlegacyclients.

Selectoneofthefollowingoptions:

• Upper—SetthePrimaryChannelastheupper20‐MHz

channelinthe40‐MHzband.

•Lower—SetthePrimaryChannelasthelower20‐MHzchannelinthe40‐MHzband.

ShortGuard

IntervalSupported

Thisfieldisavailableonlyiftheselectedradiomodeincludes802.11n.

Theguardintervalisthedeadtime,innanoseconds,betweenOFDMsymbols.The

guard

intervalpreventsInter‐SymbolandInter‐CarrierInterference(ISI,ICI).The802.11nmode

allowsforareductioninthisguardintervalfromtheaandgdefinitionof800

nanosecondsto400nanoseconds.Reducingtheguardintervalcanyielda10%

improvementindatathroughput.

Selectoneofthefollowing

options:

•Yes—TheAPtransmitsdatausinga400nsguardIntervalwhencommunicatingwith

clientsthatalsosupporttheshortguardinterval.

•No—TheAPtransmitsdatausingan800nsguardinterval.

STBCMode Thisfieldisavailableonlyiftheselectedradiomodeincludes802.11n.

SpaceTime

BlockCoding(STBC)isan802.11ntechniqueintendedtoimprovethe

reliabilityofdatatransmissions.Thedatastreamistransmittedonmultipleantennasso

thereceivingsystemhasabetterchanceofdetectingatleastoneofthedatastreams.

Selectoneofthefollowingoptions:

•On—TheAPtransmits

thesamedatastreamonmultipleantennasatthesametime.

•Off—TheAPdoesnottransmitsthesamedataonmultipleantennas.

Table19:RadioSettings(Cont.)

Field Description

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 182 183

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