Specifications

Maxiva UAX
October 17, 2013
3‐83
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
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
ay
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
st
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.