Home
Главная
D-Link
Коммутатор
DWS-4026
Руководство пользователя. Версия 2.0 Страница: 540

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [540/741] 172936

BasicSetup

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

November2011 Page540

D‐LinkUWSUserManual

Mode TheModedefinesthePhysicalLayer(PHY)standardtheradiouses.

Selectoneofthefollowingmodesforeachradiointerface.

Radio1supports:

• IEEE802.11aisaPHYstandardthatspecifiesoperatinginthe5GHzU‐NIIband

usingorthogonalfrequencydivisionmultiplexing(OFDM).Itsupportsdatarates

rangingfrom6to54Mbps.

• IEEE802.11

a/noperatesinthe5GHzISMbandandincludessupportforboth

802.11aand802.11ndevices.IEEE802.11nisanextensionofthe802.11standard

thatincludesmultiple‐inputmultiple‐output(MIMO)technology.IEEE802.11n

supportsdatarangesofupto248Mbpsandnearlytwiceth

eindoorrangeof

802.11b,802.11g,and802.11a.

• 5GHzIEEE802.11nistherecommendedmodefornetworkswith802.11n

devicesthatoperateinthe5GHzfrequencythatdonotneedtosupport802.11a

or802.11b/gdevices.IEEE802.11ncanachieveahigherthroughputwhenitdoe

s

notneedtobecompatiblewithlegacydevices(802.11b/gor802.11a).

Radio2supports:

•IEEE802.11b/goperatesinthe2.4GHzISMband.IEEE802.11bisan

enhancementoftheinitial802.11PHYtoinclude5.5Mbpsand11Mbpsdata

rates.Itusesdirectsequencespreadspectrum(DSSS)orfr

equencyhopping

spreadspectrum(FHSS)aswellascomplementarycodekeying(CCK)toprovide

thehigherdatarates.Itsupportsdataratesrangingfrom1to11Mbps.IEEE

802.11gisahigherspeedextension(upto54Mbps)tothe802.11bPHY.Ituses

orthogonalfrequencydivisionmultiplexing(OFDM).Itsup

portsdatarates

rangingfrom1to54Mbps.

• IEEE802.11b/g/noperate sinthe2.4GHzISMbandandincludessupportfor

802.11b,802.11g,and802.11ndevices.

• 2.4GHzIEEE802.11nistherecommendedmodefornetworkswith802.11n

devicesthatoperateinthe2.4GHzfrequencythatdonotne

edtosupport

802.11aor802.11b/gdevices.IEEE802.11ncanachieveahigherthroughput

whenitdoesnotneedtobecompatiblewithlegacydevices(802.11b/gor

802.11a).

RTSThreshold SpecifyaRequesttoSend(RTS)Thresholdvaluebetween0and2347.

TheRTSthresholdindicatesthenumberofoctetsinanMPD

U,belowwhichanRTS/

CTShandshakeisnotperformed.

ChangingtheRTSthresholdcanhelpcontroltrafficflowthroughtheAP,especially

onewithalotofclients.Ifyouspecifyalowthresholdvalue,RTSpacketswillbesent

morefrequently.Thiswillconsumemorebandwidthandreducethethr

oughputof

thepacket.Ontheotherhand,sendingmoreRTSpacketscanhelpthenetwork

recoverfrominterferenceorcollisionswhichmightoccuronabusynetwork,orona

networkexperiencingelectromagneticinterference.

Table326:RadioSettings(Cont.)

Field Description

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [540/741] 172936

Содержание

Похожие устройства