Exfo EXpert IPTV Test Tools (FTB-200v2) Instrukcja Użytkownika Pobierz pdf (Strona 58)

58

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Figure2‐7.

VQmon/H

Dvideo

stream

quality

analysis

algorithm



A.2.1.1 TR101290MetricsCollection

VQmon/HDcollectsandreportsthefullsetofPriority1and2metricsdescribedinTR

101290forthemeasurementandanalysisofMPEG‐2Transportstreams.

A.2.1.2 PlayoutBufferEmulator

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VQmon/HD’splayoutbufferemulatorcomponentdetectslost,duplicate,andout‐of‐

sequencepacketsandmeasurespacket‐to‐packetdelay(jitter)levels,reportingPPDV

(RFC3550)andMAPDV(ITU‐TG.1020).DetailedIPTVpacketloss/discardstatisticsare

provided,alongwithmetricsevaluatingtheeffectivenessofForwardErrorCorrection(FEC),if

used.IfReliableUDPisinuse,VQmon/HDrepor

tstheproportionofretransmittedpackets

andtheimpactonbandwidthduetoretransmission.

A.2.1.3 ContentAnalysis

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VQmon/HDperformshigh‐levelcontentanalysistodetectlevelsofdetail,motion,and

panning,andcanalsodetectsomescenechanges.VQmon/HDalsorecognizesabnormal

contentconditions(includingnocontent,noise/snow,andfrozenimage)andcangenerate

alertsiftheyaredetected.

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