User Manual

Table Of Contents
Tech-X Flex
®
(P5) Verizon Base Unit User Guide Rev B PRELIMINARY 3/20/2014
5-29
Intro
Wi-Fi
10/100
System
IP/Video
Specs
Table 5-19 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.
MPEG Trnspt Err Number of packets that indicated a transport error, by means of the transport error
bit in the packet header. The transport error bit is set to "1" when at least one
uncorrectable bit error exists in the packet.
NOTE: This result may be reported at different granularities. When reported
at the transport stream PID level, it represents errors associated with
packets assigned to that PID. When reported at the elementary stream
level, it represents errors associated with packets for the respective
elementary stream.
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 5-39.
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 5-40.
Result Description