Exfo EXpert IPTV Test Tools (FTB-1 / 2 Pro) Uživatelský manuál stáhnout pdf (Strana 30)

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 ... 25 26 27 28 29 30 31 32 33 34 35 ... 81 82

Žádné komentáře

Exfo EXpert IPTV Test Tools (FTB-1 / 2 Pro) Uživatelský manuál Strana 30