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DWS-4026
Руководство пользователя. Версия 2.0 Страница: 600

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [600/741] 172936

ConfiguringAdvancedSettings

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

November2011 Page600

D‐LinkUWSUserManual

RateLimiting Enablingmulticastandbroadcastratelimitingcanimproveoverallnetwork

performancebylimitingthenumberofpacketstransmittedacrossthenetwork.This

featureisdisabledbydefault.

Note:Theavailableratelimitvaluesareverylowformostenvironments,soenabling

thisfeatureisnotrecommended.

•ToenableMulticastandBr

oadcastRateLimiting,clickEnabled.

•TodisableMulticastandBroadcastRateDisabled,clickDisabled.

RateLimit Entertheratelimityouwanttosetformulticastandbroadcasttraffic.Thelimit

shouldbegreat erthan1,butlessthan50packetspersecond.Anytrafficthatfalls

belowthisratelimitwillalw

aysconformtoandbetransmittedtotheappropriate

destination.

Thedefaultandmaximumratelimitsettingis50packetspersecond.Thisfieldis

disabledifRateLimitingisdisabled.

RateLimitBurst Settingaratelimitburstdetermineshowmuchtrafficburstscanbebeforealltraffic

exceedstheratelimit.Thisbur

stlimitallowsintermittentburstsoftrafficona

networkabovethesetratelimi t.

Thedefaultandmaximumratelimitburstsettingis75packetspersecond.Thisfield

isdisabledifRateLimitingisdisabled.

ChannelBandwidth The802.11nspecificationallowstheuseofa40‐MHz‐widechannelina

ddition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.The40‐MHzoptionisenabledbydefaultfor802.11a/nmodesand20

MHzfor80

2.11b/g/nmodes.Youcanusethissettingtorestricttheuseofthe

channelbandwidthtoa20‐MHzchannel.

Protection Theprotectionfeaturecontainsrulestoguaranteethat802.11transmissionsdonot

causeinterferencewithlegacystationsorapplications.Bydefault,theseprotection

mechanismsareenabled(Auto).Withprotectionenable

d,protectionmechanisms

willbeinvokediflegacydevicesarewithinrangeoftheAP.

Youcandisable(Off)theseprotectionmechanisms;however,when802.11n

protectionisoff,legacyclientsorAPswithinrangecanbeaffectedby802.11n

transmissions.802.11protectionisalsoavailablewhenthemodeis802.11b/g.When

otectionisenabledinthismode,itprotects802.11bclientsandAPsfrom802.11g

transmissions.

SpaceTimeBlockCode 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chanc

eofdetectingatleastoneofthedata

streams.

Selectoneofthefollowingoptions:

• Enable—TheAPtransmitsthesamedatastreamonmultipleantennasatthe

sametime.

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

NoACK SelectEnabletospecifythattheAPsh

ouldnotacknowledgeframeswithQosNoAck

astheserviceclassvalue.

Table353:RadioSettings(Cont.)

Field Description

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [600/741] 172936

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