Base Unit User Guide Issue 1
Tech-X Flex™
5-8
5: IP and Video Testing
Intro
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Video Quality of Service (QoS)
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5.6.1 Video Quality of Service (QoS)
NOTE:
Video testing is a purchasable option. Please contact Spirent for more information.
This test provides subjective no-reference quality scores on a specific IPTV channel stream, along with a
set of network parameters, picture frame statistics, and other transport stream information.
For a single-ended, active test, the unit must emulate a video endpoint and join a multicast stream, after
which it performs the quality assessment on the traffic sent directly to it. Some interfaces, such as the
10/100 interface, provide a bridging/mirroring mechanism where the unit can be placed between two
devices and passively monitor an existing stream. In this case, the unit does not join the stream itself and
therefore supports the measurement of unicast streams as well. For more information on how the
passive bridging process works with the Ethernet interface, see
Unit setup for passive testing
For more details on how the quality assessment works, see
How the analysis works - An overview
NOTE:
The analysis focuses primarily on the data captured from the MPEG transport stream. For more
information about MPEG transport, see the information under
Digital video concepts overview
Setup - Video Quality of Service
NOTE:
If the unit has an active channel guide, the display will first present a channel selection screen
when the test setup is initiated. After channel selection, the normal setup screen will appear,
with the certain parameters prepopulated, such as the IP Address and Port. The use of a
channel guide, if available, is generally recommended. For more information, see
