Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 151)

Maxiva UAX

October 17, 2013

3‐83

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

Figure 3-77 LPU ATSC Status Screen 2

Table3‐74XmtrHome>ExciterHome>Status>ATSCModulator(screen2)

Field Explanation

ModulatorMut

e Green=OK,Red=Mute.Ifthedigitalmodulatorsectionisactivelymuted,thiswillindicatered.

NegativeDel

InSFNsitua

tions,theexcitercanonlyinsert(add)delay.Ifthetimingparametersareimproperly

setatthetransmissionadapteroranetworkchange(suchasasubstitutingasatellitepathfora

microwavepathtogetthetransportstreamtotheexciter)theexcitermaydeterminethatbased

ontheres

ultanttiming,theresultindicatesthatitmustremovedelaytoactuallymeetthe

emissiontiming.Thissimplyisn'tpossibleandwillbeindicated.

DelayEx

ceeds1

Second

Green=Dela

y<1second,red=delay>1second.Transmitterdelay,forSFN(singlefrequency

network)datatransmissionsynchronism,ismeasuredagainstthe1PPS(pulsepersecond)pulse.If

transmitterdelayexceeds1second,SFNdatatransmissionsynchronismisimpossible.

MutetoIn

creaseDelay

Modulatorhasde

terminedthatitcannolongermeettherequiredtiminganditmustmuteit's

outputtore‐syncandincreasethedelayinserted

MuteCou

nt Thisisthenumberoftimesthedigitalmodulatorhasbeenmuted.

ResetMut

eCount

SoftKey

Pressingthissoftke

yresetsthemutecounttozero.

MaxDelay

ThisisareadbackofthemaximumdelayparameterbeingcarriedinsidetheDistributed

TransmissionPacket.ItshouldmatchthevaluesetintheDistributedTransmissionAdapter.This

valueisindicativeofthemaximumtransportdelaythenetworkdesigner/operatorexpectstosee.

It'smaximumvalueis100nSle

ssthan1second.

TransportDelay

Thisistheti

mefromwhenapacketisreleasedinsidethetransmissionadapteruntilthetimeit

arrivesinthemodulator.ItalsoincludesanominalamountofinternalFIFObufferholdtime.

OffsetDelay

Timeo

ffsetforemissioncontainedintheDistributedTransmissionPacketforthisparticular

transmitter.

DelayAdju

Thisisady

namicindicationoftheamountofdelayadjustmentthemodulatoriscomputing.

Nominallythisshouldbezero.Itoftenmovesplusorminus100nSforminoradjustments.

Importantthatitisrelativelystable,notwildlyfluctuating.

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Sharp SD-AT1000W Especificaciones Pagina 151

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