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Section-1 Introduction

October 17, 2013

1‐10

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

1.6 TransmitterControlUnit(TCU)

Indual‐drivetransmittersystemswithredundantLPUs,theoptionaltransmittercontrolunit(TCU)servesasthe

maincustomerinterfaceandLPU(exciter)switcher.

Figure 1-8 Transmitter Control Unit (TCU) - Front Panel Lowered

TheTC

Ucontainsthefollowingmodularsubassemblies:

a. Agraphicaluserinterface(GUI)basedona5.25",color,1/4VGA,touchscreen,panelPC.

b. Aseriesoffrontpanelpushbuttonstoprovideimmediateaccesstothemostimportantcommandsandsta‐

tusinf

ormation.

c. Fourplug‐incircuitscards:

1. MCMboard(MainControlModule,onright)–Themaincontr olcardresponsible

fortransmittercontrolandcontrollingtheothercardsintheTCU.

2. PCMboard(ProcessControlModule,secondfromright)–Providestheenhanced

customerinterface,includingwebpagesservedtothelocalGUIscreenandweb

pagesand/orSNMPin

formationoverEthernettoaremoteuserasrequired.

3. LAX/VAXTCUInterfaceboard(thirdfromright)‐Interfacestoseveralofthesub‐

systemsspecifictoaVAXdualconfigurationsystem,suchastheRFswitchand

thesysteminterlockline.

4. CustomerI/Oboard(fourthfromright)‐Providesforallcustomerparallelin

ter‐

faceconnectionsontheI/Opanelontopofthetransmitter.

TheTCUalsocontainsabaseplaneboardtoprovideacommonbusforthevariousplug‐incardsandinternalpower

supplymodules.

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