ITU-T Recommendation G.107
(http://www.itu.int/itudoc/itu-t/aap/sg12aap/history/g107/index.html)
gives the algorithm for the so-called E-model as the common ITU-T
Transmission Rating Model. This computational model can be useful to
transmission planners, to help ensure that users will be satisfied with
end-to-end transmission performance. The primary output of the model is
a scalar rating of transmission quality. This rating can be mapped to a
predicted mean opinion score. A major feature of this model is the use
of transmission impairment factors that reflect the effects of modern
signal processing devices.
In the year 2000 revision, an enhanced version of the E-model was
provided, in order to better take into account the effects of room noise
at the send side, and quantizing distortion. With the year 2002
revision, the impairment due to random packet-loss has been included in
a parametric way for different codecs.
Various parties in the telecomm industry use the E-model to compute
predicted mean opinion score based on packet loss and end-to-end delay
for a given audio codec. Several vendors sell systems that monitor
packet performance and report "mean opinion score". At best, this "mean
opinion score" is a single number that summarizes packet performance
with respect to both packet loss and delay, so some service providers
write Service Level Agreements in terms of this "mean opinion score"
instead of specifying the raw loss and delay measurements.
It is important to remember that the E-model has literally dozens of
other parameters. In order to use the model as described above, the
provider must assume that all the other parameters are fixed at some
nominal values; nobody actually measures them. It is also important to
remember that Recommendation G.107 begins with a very explicit
disclaimer:
"Such estimates are only made for transmission planning purposes and not
for actual customer opinion prediction (for which there is no
agreed-upon model recommended by the ITU-T)."
Harvey S. Cohen
Message: 16
Date: Mon, 12 Apr 2010 11:16:58 -0400
From: ankur aggarwal <ankur.mast.frn@xxxxxxxxx>
Subject: [Wireshark-users] mean opinion score
To: Community support list for Wireshark
<wireshark-users@xxxxxxxxxxxxx>
Message-ID:
<y2o8176612d1004120816n1a6c2923u87ebc21cca3aad95@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Can anybody help me in finding MOS through wireshark or any other s/w
which
work on my intranet. (offline mode).
--
With Regards
Ankur Aggarwal
Research intern
Optical Zeitgeist Laboratory
Institut National de la Recherche Scientifique (INRS) - ?MT
800, de la Gaucheti?re Ouest, bureau 6900
Montr?al, QC, H5A 1K6
CANADA
Ph: +1 514 966-2661
E-mail: ankur.1066@xxxxxxxxx
Web: www.zeitgeistlab.ca
Group Member Page: http://zeitgeistlab.ca/doc/groupmembers.html
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