Motorola GTR 8000 - Figure 2-2 Transceiver Control Board Information Flow; Transceiver Control Board; Transceiver RF Board

GTR8000BaseRadio
•TransceiverRFBoard:ContainsDCpowerconversion/regulationandperformsreceiverandexciter
functions.
•TransceiverOptionCard:Anoptionalboardthatattachestothecontrolboard.Providesaninternal
10MHzfrequencyreference.Forconventionalbaseradio/receiveroperationitalsoprovidestheanalog
interfacesandwildcardI/Os.Thetransceiveroptioncardrequiresaninternalfrequencyreferenceoscillator
alignmentatdifferentintervalsthatismandatedbyitscategoryandfrequencyband.SeeBaseRadioService
Help>ServiceScreens>AlignmentScreensintheCSSOnlineHelpforthealignmentproceduresand
mandatedintervals.Thetransceiveroptioncardisavailableintwocategories:
–OCXO(OvenControlledCrystalOscillator)–operatesat0.1ppmwhichisinclusivetotemperature
andaging.TheOCXOTransceiverOptionCardisavailablein700/800MHz,UHFR1/R2,andVHF
frequencybands.
–TCXO(TemperatureCompensatedCrystalOscillator)–operatesat1.5ppm,ofwhich0.5ppmis
allocatedtotemperatureand1.0ppmisallocatedtoaging.ReferenceprecisionwiththeTCXOis
tradedforlowerpowerconsumption.TheTCXOmandatesshortermaintenanceintervals.TheTCXO
transceiveroptioncardisavailableinUHFR1/R2frequencybands.TheTXCOisonlyavailablefor
non-simulcastconventionalsystems.
2.1.1.1TransceiverControlBoard
ThemainoperatingsoftwareforthebaseradioisloadedintheXCVRscontrolsection.Asthemainmanagerfor
thebaseradio,theXCVRcontrolboardprovidesoperationalcontrolovertheotherstationmodules.Ithandles
threetypesofinformationow,inthefollowingways:
•ServesasagatewaybetweenthenetworkandRFfunctionality,bydistributingtheRFpayloadtoand
fromthenetwork.
•Supportsoperationalanddiagnosticfunctionswithdigitalcontroldata(forexample:siteinformation,
channelassignments,andidenticationnumbersforcallprocessing).
•Ensurestheowofothernetworkmanagementcongurationinformation.
Figure2-2showstheinformationowthroughthetransceivercontrolandRFsectionsfortrunkedanddigital
conventionaloperation.
Figure2-2TransceiverControlBoardInformationFlow
2.1.1.2TransceiverRFBoard
InadditiontoDCpowerconversion/regulation,theXCVRRFboardprovidescircuitryforthefollowingexciter
andreceiverfunctions.
2-2
6871022P86-A-November2012