User's Manual Part 2

Tech-X Flex

(NG2) Tech-X Flex User Guide - Firmware v06.50

6-37

Intro

Overview

Wi-Fi

Ethernet

System

IP/Video

MoCA

Specs

Table 6-22 Video QoS - Transport results, Jitter/Delay Stats tab

NOTE: Not all stream types defined in ISO/IEC 13818-1 are supported. Any packets from unsupported

types are discarded and excluded from all test results.

Table 6-23 Supported stream types/names

PCR Repetition Err Number of times that the interval between PCR (program clock reference)

transmissions exceeded 100 ms, if the discontinuity indicator is not set. The PCR

is used as a time synchronization tool between the encoder and decoder. If the

discontinuity indicator is not set, the encoder expects a 100 ms or smaller interval

between PCRs. Both the PCR and discontinuity indicator are part of the packet

header.

PTS Err Number of times that the PTS (presentation time stamp) repetition period

exceeded 700 milliseconds. A PTS is a part of the PES packet header and

indicates the exact moment when a video frame or an audio frame has to be

presented to the user. It is important for synchronization of the audio and video

streams. Note that this parameter is always reported as NA for elementary

streams that do not have presentation time stamps.

Result Description

MAPDV The true average mean-absolute packet delay variation in milliseconds. This type

of measurement is sometimes referred to as jitter.

For more information on MAPDV, see About packet delay variation (PDV) on

page 6-47.

PPDV The packet-to-packet delay variation in milliseconds, according to a calculation

model defined in RFC 3550.

For more information on PPDV, see About packet-to-packet delay variation

(PPDV) on page 6-48.

Stream type value Stream type name

2 or 128 MPEG-2 VIDEO

3 MPEG-1 Layer II AUDIO

4 MPEG-2 AUDIO

Result Description

Preliminary issue - Limited distribution only!