Sharp SD-AT1000W Especificações descarregar pdf (Página 112)

Section-3 Operation

October 17, 2013

3‐44

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

Figure 3-42 LPU ISDB-T Setup Screen 2

Table3‐31XmtrHome>ExciterHome>Setup>ISDB‐TModulator>Next(screen2)

Fields Explanation

SFNMode Choicesar

eMFN(MultipleFrequencyNetwork)orSFN(SingleFrequencyNetwork).

EqpmntID

Rangeis0to63.E

quipmentIDisassignedbytheSFNnetworkadministratorandisprovidedto

allowauniqueidentifierforeachtransmitterintheSFNcell.WhentheequipmentIDintheIIP

packetmatchesthelocalequipmentID,thentheIIPTimeOffsetinformationisextracted

RFO

utputifSFN/IIPError

Choicesar

eYesorNo.Ifnoisselected,transmitterwillbemutedifSFNinformationismissing

fromthetransportstreamorSFNdelaycalculationsresultinnegativedelaysordelaysgr eater

thanonesecond.Ifyesisselected,theexciterwilloutputRFwhichisnotproperlySFN

synchroniz ed.

LocalOffsetDelay

Thisallowsthetransmitteroperatortosetadelayforthetransmitterlocally.Itspurposeisto

causetheRFoutputtobedelayedadditionallybytheamountentered.

LocalRFDela

Thisisthetimedelaycau

sedbythetransmitter’shighpowerfilterandtransmissionlineas

welltheGPSdelaycausedbyitscablelength.ItspurposeistocausetheRFoutputtobe

releasedearlierbytheamountenteredtherebynullingouttheabovementionedRFdelays.

IIPRe

newalFlagCntr

(counter)

RenewalFlagisabitintheIIPpa

cketwhich,onthetransitionfrom1to0,indicatesthe

informationintheIIPpacketisvalid.

There

newalflagcounterprovidestheoperatorwithanindicationthattheIIPinformationis

beingupdatedonaregularbases.NotethattheMaxDelayandIIPTimeOffsetisonlyupdated

whentheIIPRenewalFlagchangesfrom1to0.Onexciterpowerup,themodulatorwillwait

ranIIPrenewalflagtransitionfrom1to0,whichindicatestheIIPpacketdataisvalid.

IIPTi

meOffset

TheII

PTimeOffset,inms,allowstheSFNAdapterupstreamtosendanoffsettimeto

individualtransmittersintheSFNnetwork.ThisallowstheSFNnetworkoperatortochange

anyofthetransmitterdelaysintheSFNfromonecentrallocation,theSFNadapter.

IIPMa

xDelay

Thisdela

yissentfromtheSFNAdaptortothemodulator.Itindicatesthetimefromthetime

stampintheIIPpackettowhentheheadofthemultiplexedframeistobeemitted.

ProcessingDela

ProcessingDel

ay,inms,isthetimerequiredforthesignaltopropagatethruthemodulator

duringthemodulationprocess.Thistimeomitsthedelaycausedbythetimeinterleaver.

NetworkDel

ThistimeinmsisthetimerequiredforthetransportstreamtotravelfromwheretheIIP

packetistimestampedintheSFNadaptoruntilthepacketisreceivedbythemodulator.

SFNSt

orageTime

Storageti

me,inmsistheMaxDelayplusthelocalRFDelay,minustheprocessingDelay,minus

theLocalOffsetDelay,minustheIIPOffset

Delay,mi

nustheNetworkDelay.SFNStorageTimeisthedelaybufferincorporatedinthe

modulatortoprovidetherequireddelayforSFNoperation.

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Sharp SD-AT1000W Especificações Página 112

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