User's Manual

1/28/2015 LMU42x0Hardware&InstallationGuidePULSWiki
https://puls.calamp.com/wiki/LMU42x0_Hardware_%26_Installation_Guide 33/47
ExamplesOK(Yellow)andPoor(Red)internalantennaplacements
5.2.3AccesstotheSIM(SubscriberIdentityModule)Card
WhenusedinaGSMoriDENnetwork,eachLMUusesaSubscriberIdentityModule(SIM)card,which
shouldbeinsertedbeforeyouinstalltheLMUforthefirsttime.TheSIMcardisattachedtothemainboard
insidethehousingoftheLMUunit.
Atsomefuturetime,youmightneedorwanttoreplacetheSIMcardwithadifferentone,sotrytoinstallthe
LMUinsuchawaythatthecovercanberemovedtomaketheSIMcardaccessible.
5.2.4ProtectionfromHeat
ItisbestnottoplacetheLMUunitinanunusuallywarmlocationsuchasdirectlynearheatervents,nearhot
enginecomponentsorindirectsunlight.ThemaximumtemperaturethatcanbetoleratedbytheLMUis
describedintheLMUEnvironmentalSpecificationssection.
5.2.5VisibilityofDiagnosticLEDs
StatusLEDlightsonthefrontoftheLMUunitcanprovidevaluableinformationabouttheoperationofthe
LMU.Whenfeasible,attempttoinstalltheLMUinsuchawaythattheselightscanbeseenwithreasonable
ease.
YoumayfinditusefultobeabletoviewtheLEDsperiodicallytomakesurethattheLMUisoperating
properly.IfatanytimeyoushouldencounteraproblemwiththeLMU,youmayneedtoreadtheLEDsin
ordertotroubleshoottheproblem.IfyoucannotfixtheLMUyourself,youwillneedtoprovidetheLED
informationtoCalAmpcustomersupport.
ForinformationabouthowtointerprettheLEDs,seetheStatusLEDBehaviorsection.
5.2.6CableLength
TheRFcableswhichareprovidedforconnectingtotheLMUantennasshouldbeusedatthelengthprovided.