IPTV Result Video (Page #6) -
displays the
Media Delivery Index (MDI)
results;
MDI (Media Delivery Index)
- value in a ratio
DF (Delay Factor)
- Average, Minimum and Maximum values. Also defined as cumulative IP jitter, it represents the time it
would take to drain an output buffer and
ensure good video playback.
MLR (Media Loss Rate)
- Average, Minimum and Maximum values. Also defined as the packet loss rate due to dropped
packets, bad/corrupted packets, or out-of-sequence packets.
IPTV MDI Results
Media Delivery Index (MDI)
Defined in RFC4445, MDI is the only standardized
video quality metric available today.
MDI quantifies two IP transport impairments, namely
Packet Jitter or Delay and Packet Loss.
These test parameters are defined as Media Delay
Factor (MDI-DF) and Media Loss Rate (MDI-MLR).
The
Delay Factor (DF)
indicates how long a
data stream must be buffered at its nominal bit
rate to prevent packet loss. It gives a general
idea of network jitter using the DF measurement.
The MDI-DF can give a measure of congestion in
a network, by showing utilization level, and
detect if queuing is happening in network
components, but it does not indicate how much
of this is due to video packet bunching.
The
Media Loss Rate (MLR)
is the number
of packets lost during a 1 second period.
MDI is expressed as a ratio namely;
Delay Factor : Media Loss Rate, e.g. 70:15
The above ratio shows a delay factor of 70ms
and 15 packets lost per second.
MDI and MPEG packet loss together provides a good
indication of IP transmission and non related IP issues.
MX100/120 e-Manual D07-00-004 Rev A04
Page 97 of 115
