Exfo EXpert IPTV Test Tools (FTB-200v2) Manual de usuario descargar pdf (Pagina 31)

31



8.3.2TransportPacketMetrics



TransportPacketsare

MPEG‐TSpacketsthat

carryPacket

ElementaryStream

(PES).



Statisticsofthese

MPEG‐TSPacketssuch

aslost,discarded,

corrected,out‐of‐

sequenceand

duplicatedpackets

allowdetectionofthis

majorsourceofvideo

picturedegradation.

JitterMetrics

focusonthePCR

Jitterwhichis

definedasTime

Stamparrival

timejitter.



PCRJitterisa

majorcontributor

tolossofframes

duetorouteror

STBbuffer

overflow.

RTPPacketMetrics(ifavailable)arestatisticsofRTPprotocol

encapsulation.RTPencapsulationisoptionalandisusedtoprovide

independenttimestampingtovideoandaudio.Butitalsoaddsoverhead

tothetransmission.



TrackingRTPstatisticsallowsproblemisolationtotheRTPencapsulating

device.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 81 82

Sin comentarios

Exfo EXpert IPTV Test Tools (FTB-200v2) Manual de usuario Pagina 31