User's Manual

RLX2 Industrial Hotspot Series
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ProSoftTechnology,Inc. Page81of208
February5,2015
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Field
Description
ParentBranchLength
RLX2radiowillchooseitsparentstrictlybythenumberofrepeatersbetween
itandtheMasterradio.IfaBranchLengthof1ischosen,theRLX2radiowill
linkonlytotheMasterradio.IfaBranchLengthof2ischosen,theRLX2radio
willlinkonlytoanotherRLX2radiothatislinke
dtotheMasterradio,andso
on.Ifmultiplecandidatesareavailableataparticularhopcount,theRLX2
choosestheParentthathasthesmallestcost.
PreferredParent
RLX2radiowillselectitsparentfromalistofpossibleparentsspecifiedbythe
user.Whenthisoptionisselected,alistofuptoeightMACAddressentry
fieldsbecomevisible.TheuserentersoneormoreMACAddressesofthe
RadiosthattheRLX2mustchoosefrom.
 BestinList
Whe
nBestinListisselectedtheradiowillselectitsparentusingthe
"AutomaticParentSelection"algorithm,butitwilllimittheselectionto
thelistofradiosinthelist.Therefore,theradiointhelistwiththe
lowestcostaccordingtothealgorithmwi
llbechosenasitsparent.
 FollowListPriority
WhenFollowListPriorityischosentheradiowillselectitsparentfrom
thelistgivingpreferencetothe1stentryfollowedbythe2ndentryand
soon.
Parent Selection Parameters
SignalStrengthThreshold
Whenthesignalfromaparentreachesahighenoughvalue,astrongersignal
willnotimprovethequalityofthelinkanyfurther.Forsignalsthatareabove 
thatthreshold,onlyfewerhopsfromtheMastergivepreference.The
thresholdcanbeadjustedhere.Anotherwaytoconside
rthisinFastRoam
applications,isthattheRLX2willnotRoamtoanewParentatthesamehop
countleveluntilitscurrentParent’sRSSIgoesbelow(weaker)thatthisvalue.
ParentMargin
InFastRoamapplicationswheretheRLX2isonamobileplatform,orthereis
alotofmovementintheenvironmentcausingRSSIlevelstofluctuate,itis
desirabletohavetheRLX2sticktoitscurrentParentunless a betterParent’s
RSSIisstrongerthanthisvalue.Thismarginvalu
eisaddedtothecurrent
Parent’sRSSIpriortocalculatingitscost.Itisdesirableto‘roam’toanew
ParentpriortolosingtheconnectionwiththecurrentParentwhichresultsin
dataloss.
AvaluetoosmallinthisparametercanleadtoanRLX2ping‐pongi
ngback
andforthbetweentwoParentsastheRSSIlevelsfluctuate.Avaluetoolarge
couldresultinaroamnotoccurringuptothepointwheretheunitmovesout
ofrange,eventhoughacandidateexiststhatisactuallybetterthanthe
currentParent.
Thedefaultvalueis5dB.La
rgervalues(10‐15dB)shouldbeusedtoprevent
falseroamsfromoccurringduetotemporaryRSSIinversionsbetweenthe
currentParentandanothercandidate,withthecaveatofcourse,thataroam
pointexistswheretheRSSIdifferencebetweenthecurrentParentandthe
newParentisgreaterthanthismargin.