Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál stáhnout pdf (Strana 80)

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Transport Metrics

PacketLossMetricsprovideessentialdataonIPTVpacketlossbeforeandaftertheeffectsof

errorcorrection(suchasFECorReliableUDP).Burstandgapstatisticsprovidevaluable

insightintothetimedistributionoflostanddiscardedpackets.

MPEG-TS Packet Loss Metrics

Metric Description

PacketLossRate PercentageofMPEG‐TSpacketslostinthenetwork

PacketDiscardRate Percentageofpacketsdiscardedduetolatearrival

OutofSequencePacketRate Percentageofpacketsarrivingoutofsequence

DuplicatePacketRate Percentageofduplicatepackets

BurstLossRate Percentageofpacketslostwithinburstperiods

BurstLength Averagelengthofburstperiods

GapLossRate Percentageofpacketslostwithingapperiods

GapLength Averagelengthofgapsbetweenbursts

PCR(ProgramClockReference)JitterMetrics

Metric Description

PCRJitter ProgramClockReferenceJitter

MDI(MediaDeliveryIndex)Metrics

Metric Description

MDIDelayFactor MediaDeliveryIndexDelayFactoristhemaximumdifference,observed

attheendofeachmediastreampacket,betweenthearrivalofmedia

dataandthedrainofmediadata

MDIMediaLossRate MediaDeliveryIndexLossRateisthecountoflostorout‐of‐orderpackets

carryingstreamingapplicationinformationoveraselectedtimeinterval,

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Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál Strana 80