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Functional Description
CP525 cMux User’s Manual Rev. 5.20.12 (3944)
ID: um_tsmux
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Section number
Ti
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Ideal playout time
Actual playout time,
back-log > 0
Actual playout time,
back-log = 0
A: Not enough bandwidth,
delay building up
B: Over-capacity; playout
speeds up to ”catch up”
”Back-log” time
Figure 5.11
Illustration of back-log principles
The dark green graph illustrates the “ideal” transmission time for each section. It is a long line
with “even” spacing between each table section.
The purple graph illustrates a table that does not allow for “back-log”. In period B, the distance
between each section again becomes the normal, configured interval.
The red graph illustrates the case when a back-log is configured larger than zero. In this case,
the CP525 will actually reduce the transmission interval until the “ideal” line again is reached.
This means that the average repetition interval will be fulfilled.
The back log time is controlled by a configuration parameter “Backlog time”, which is specified
as a fraction of the repetition interval. The default value is 1.0, which indicates that a table is
allowed to be delayed by time for one, complete repetition interval.
5.11 Handling of expired EIT schedule events
The CP525 supports advanced playout of EIT schedule, splitting the total number of available
segments into up to 4 groups with different repetition intervals for each group. The group
boundaries are set on 1 day segment boundaries.
Additional options for special treatment of segments with Events that are expired can be enabled
with the ’advanced playout’ feature key. These options are referred to as ’expired events’ and
’sliding window’ and are described in this chapter.
Summary of Contents for CP525 cMux
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