Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál stáhnout pdf (Strana 27)

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 CheckSummarymetricsforaquicksignalquality.Summaryprovidesalistofindustry

mostusedparametersforquickevaluationofIPTVservicequalitysuchasMOSScore,

PCRJitter,VideoPacketLoss,TR101290andIGMPLatency(zaptime).

Definitions:



Tab Category MetricName Range Description

Summary Summary MeasurementTime 0‐12hrs TotaldurationoftestinsecondsfromthetimeSTARTwas

pressedtothetim eSTOP waspressed

AverageAudio/Video

MOS

1.0‐5.0 TheaverageMOS‐AVacrossallcompletedaudio/video

streamsmonitoredonthelogical

interface.(Thisdoesnotincludeactivestreams.)

MaxPCRJitter ms ThePCRjitterinmilliseconds

VideoPacketLossRate % Totalproportionofstreamtransportpacketslostor

discarded(minuscorrected)

TR101290Errors NA TheoccurrenceofaTR101290Priority1error,TR101290

Priority2errororboth.

IGMPLatency 0‐3sec ThetimefromIGMPJoinrequesttothestreamarrival

time

Video

Description

Information

IPSourceAddress NA ThesourceIPaddress

IPDestinationAddress NA ThedestinationIPaddress

SourcePort NA Thesourcetransportport.

DestinationPort NA Thedestinationtransportport

Protocols NA Theencapsulationofthestream,forexampleUDP/RTP,

UDP,UDP/TCP,etc.

CodecType NA ThevideocodecusedfortheMPEG‐TSframesinthe

stream

GroupofPictureType NA TheGOPstructureexpressedasaseriesof‘I’,‘B’,‘P’

charactersdescribingtheframetypeseriesinthe

structure.

CurrentGOPLength NA ThecurrentGOPlength,inframes.

AverageGOPLength NA TheaverageGOPlength,inframes.

FrameWidth Pixels Thevideoframeimagewidth,inpixels.

FrameHeight Pixels Thevideoframeimageheight,inpixels.

FrameRate Framesper

sec

Thevideoframerate,inframesperonethousand

seconds–e.g.29,970equals29.97framespersecond.

Interlaced 0OR1 ABooleanvalueindicatingwhetherthestreamis

interlaced(TRUE),withalternatingscanningofevenand

oddscanlinesorprogressive(FALSE),withscanningline

bylineinorder.

AverageNumberofSlices

inI‐frame

 TheaveragenumberofslicecontainedineachI‐frame

ReferenceClockRate Khz The33‐bit valueoftheMP2TSprogramclockreference

(PCR)90kHzportion.

AverageVideo

Bandwidth

Mbits/s Theaveragebandwidthofthevideostreamin

Mbits/second.

AveragePacketSize  Theaveragepacketsizeofthevideostream.

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