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Functional Description
CP525 cMux User’s Manual Rev. 5.20.12 (3944)
ID: um_tsmux
5.10.3 Carousel bitrate
In a typical scenario, the available Null packet rate available for PSI/SI/PSIP playout will be
variable, as shown in figure
.
TS Bitrate
22Mbit/s
Bandwidth occupied by main components (audio/video)
Remaining variable bandwidth available for carousel data and Null packets
Time
Figure 5.9
Illustration of remaining variable bandwidth in
transport stream
It will be possible to configure at least 3 scenarios with the CP525 product.
1. There are plenty of available bandwidth in the transport stream, and the resulting
bandwidth due to repetition rate configuration fits well within the available bandwidth.
2. The configured repetition rate results in a bandwidth that is too high compared to the
available bandwidth. The playout carousel will utilise all available bandwidth.
3. Carousel max. bitrate is set to a certain value to guarantee a certain amount of Null
packets in the outgoing transport stream. If the repetition intervals are set sufficiently
low, the carousel playout will utilise all the bandwidth within the configured limits.
The 3 scenarios are shown in figure
.
Video/Audio
Video/Audio
Video/Audio
Carousel Data
Null Packets
Carousel Data
Carousel Data
Video/Audio
Null Packets
1. All repetition intervals fulfilled.
2. Complete saturation
3. Bandwidth limited playout
Figure 5.10
Three different playout scenarios
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