Installation Manual

IBRInstallationGuide
 Page32of40 Doc#770‐00001‐13
 Sept.21,2014
Ifanyofthesevaluesisoutsidetherequiredoperatingrange,itmightbenecessarytoreposition(i.e.,rotate,
elevate,ormove)oneorbothIBRs,ortoswapendsofthelink.
2.6. RepositionIBR
ItmightbenecessarytoperformoneormoreofthefollowingproceduresforeitherorbothIBRs.Which
repositioningstrategyshouldbetriedfirstwillbeadecisionthefieldengineerwillneedtomakebasedon
observationsatthemountinglocations.
Inallcases,bemindfulofcablelengthsandtie‐downs,andpowerconnections.
CAUTION:WHENPOWERISAPPLIEDTOIBR,IBRAUTOMATICALLYWILLBEGINTRANSMITTING.DONOT
TRYTOREPOSITIONIBRWHENPOWERISCONNECTED.
2.7. RotateIBR
IBRcanberotatedtopointmorecloselyinthedirectionoftheotherIBRortowardsomeobjectthatmight
providereflectionofthesignals.Theobjectiveistoimprovereceivedsignalsatbothendsofthelink.
1) Loosenthemountingbracket.
2) RotatetheIBRtothedesiredalignmentposition.
3) Retightenthemountingbracket.
4) Checktheradiostatustoverifysignallevelimprovement.
IBR101#showinterfaceradio0status
5) Repeatuntilthesignallevelimprovesandalinkisestablished.
2.8. ElevateIBR
IfIBRismountedonapoleormast,itmightbepossibletomoveitupwithoutremovingIBRfromits
mountingbracket.IfIBRismountedonawall,itwillbenecessarytoremoveIBRfromthebracketandmove
thewall‐mountportionofthebrackettoahigherlocation.
ElevatingIBRonlyafootortwocanmakeasignificantimprovementinreception.
2.9. ChangeLocation
Oftenamoresuitablelocationnearthecurrentlocationcanbeselectedtoreduceinterferencefromphysical
(non‐radiating)objects,and/orfromsourcesofRFradiations(e.g.,otherradios)thatareoperatinginthe
area.Anewlocationonthesamerooftoporevenonthesamemountingassetoftencanimprovereception
signallevels.
2.10. RepositionEachIBRtotheOtherEndoftheLink
BecausethetwoIBRsreceiveindifferentfrequencybands,swappingendsofthelinkcanimprovelink
performancewhenoneoftheradiosisoperatingnearanotherradiothatistransmittingneartotheIBR’s
receiveband.Thisisalsooftentheeasiestsolutionsinceth
eexistingmountsandconnectionscanbeutilized
andonlytheIBRsneedtobemoved.
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A3. PacketFloodorStormCondition
IfanIBRpairwithadefaultconfigurationestablishesawirelesslinkandtheconnectingEthernetinterfaces
areconnectedtothesamelayer2network,aloopwillbeformedandabroadcaststormwilloccur.Whenthis
happens,thenetworkinterfaceswillbecomeinaccessible,andtheIBRCLIwillbecomeslowtorespond.All
otherdevicesonthecollisiondomainwillbeinaccessible.