Enterasys RoamAbout RBT-4102 - Page 95

Radio Interface
RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-59
• RadioChannelspecifiesthechannelnumberfor theoperatingradiochannelintheaccesspoint.
–The802.11aradiochannelthattheaccesspointusestocommunicatewithwirelessclients.
Whenmultipleaccesspointsaredeployedinthesamearea,setthechannelon
neighboringaccesspointsatleastfourchannels
aparttoavoidinterferencewitheach
other.
–The802.11b/gradiochannelthattheaccesspointusestocommunicatewithwireless
clients.Whenmultipleaccesspointsaredeployedinthesamearea,setthechannelon
neighboringaccesspointsatleastfivechannelsaparttoavoidinterferencewitheach
other.Forexample,
intheUnitedStatesyoucandeployuptothreeaccesspointsinthe
samearea(e.g.,channels1,6,11).Alsonotethatthechannelforwirelessclientsis
automaticallysettothesameasthatusedbytheaccesspointtowhichitislinked.Range:
1‐11;
Default:6
• AutoChannelSelectenablestheaccesspointtoautomaticallyselectanunoccupiedradio
channel.Default:Enabled
• WorkingMode(802.11b/gONLY).Theaccesspointcanbeconfiguredtosupportboth802.11b
and802.11gclientssimultaneously,802.11bclientsonly,or802.11gclientsonly.
Default:802.11band802.11g
• TransmitPoweradjuststhe
poweroftheradiosignalstransmittedfromtheaccesspoint.The
higherthetransmissionpower,thefartherthetransmissionrange.Powerselectionisnotjusta
tradeoffbetweencoverageareaandmaximumsupportedclients.Youalsohavetoensurethat
high‐powersignalsdonotinterferewiththeoperation
ofotherradiodevicesintheservice
area.(Options:100%,50%,25%,12.5%,minimum.)Default:100%
• MaximumTxDataRateidentifiesthehighestdesiredtransmissionspeedforthebroadcast
trafficasforwardedbytheAPtothewirelessLAN.
– 802.11adefines6,9,12,18,24,36,48,54Mbpsdata
ratesinthe5GHz band.
– 802.11bonlydefines:1,2,5.5,11Mbpsdataratesinthe2.4GHzband.
– 802.11gonlydefines:6,9,11,12,18,24,36,48,54Mbpsdatarates.
– 802.11band802.11gdefines:1,2,5.5,6,9,11,12,18,24,36,48, 54Mbps
datarates.
• MulticastDataRatesetsthespeedtosupportformulticasttraffic.
Thefasterthetransmitspeed,theshorterthecoverageareaatthatspeed.Forexample,anAP
withan802.11b11Mbit/sRadioCardcancommunicatewithclientsuptoadistanceof
375feetinasemi
‐openenvironment.However,onlyclientswithinthefirst165feetcan
communicateat11Mbit/s.Clientsbetween165and230feetcommunicateat5.5Mbit/s.
Clientsbetween230and300feetcommunicateat2Mbit/s;andclientsbetween300to375feet
communicateat1Mbit/s.
• BeaconInterval(20‐1000)
setstherateatwhichbeaconsignalsaretransmittedfromtheaccess
point.Thebeaconsignalsallowwirelessclientstomaintaincontactwiththeaccesspoint.
Theymayalsocarrypower‐managementinformation.Default:100Ms
• DataBeaconRate(1‐255)setstherateatwhichstationsinsleepmodemust
wakeuptoreceive
broadcast/multicasttransmissions.
KnownalsoastheDeliveryTrafficIndicationMap(DTIM)interval,itindicateshowoftenthe
MAClayerforwardsbroadcast/multicasttraffic,whichisnecessarytowakeupstationsthat
areusingPowerSavemode.Thedefaultvalueof2indicatesthattheaccesspointwill
saveall
broadcast/multicastframesfortheBasicServiceSet(BSS)andforwardthemafterevery
secondbeacon.UsingsmallerDTIMintervalsdeliversbroadcast/multicastframesinamore
timelymanner,causingstationsinPowerSavemodetowakeupmoreoftenanddrainpower