User Manual

Verizon Base Unit User Guide Rev B PRELIMINARY 3/20/2014 Tech-X Flex
®
(P5)
5-22
Intro
Wi-Fi
10/100
System
IP/Video
Specs
Coder Class Video coder class, which describes the ability of the stream to tolerate packet
loss with respect to perceived quality. The coder class is determined by two
contributing factors:
• Codec - Some codecs, particularly older codecs, are very sensitive to packet
loss and degrade very quickly with small amounts of loss.
• Error correction and concealment - A number of loss mitigation techniques
may be employed to conceal packet loss, typically involving coordination
between the video server and client where checksum and other validation
methods allow missing data to be supplemented.
The specified value determines how heavily the analysis weights the effects of
packet loss. For example, if you specify an operation at high rates of loss, any
detected loss will have less of an effect on final quality scores. This is normally a
static setting on any given network that does not change between tests.
Valid values are:
• A - Stream can operate over networks with up to 20% packet loss
• B - Operation with up to 10% loss
• C - Operation with up to 5% loss
• D - Operation with up to 0.5% loss
International Code Country/continent code, used to adjust quality scores based on cultural
differences in different global regions. For example, subjective human testing
using the same video stream have indicated that MOS scores in Japan are
typically lower than those found in Europe and North America. It should be noted
that this setting is purely subjective based on existing statistical data and cannot
be assured to accurately represent any particular individual.
Valid values are:
• NA - North America
• SA - South America
• EU - Europe
• AF - Africa
• AS - Asia
• JP - Japan
• AUS - Australia
Parameter Description