T-VIPS CP525 cMux, User Manual

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32 Functional Description
CP525 cMux User’s Manual Rev. 5.20.12 (3944) ID: um_tsmux
Table 5.1 PSI/SI/PSIP playout table ID process priorities
Process
Priority
Table IDs
1 PAT, CAT, PMT
2 NIT actual, SDT actual, EIT p/f actual, TDT, TOT, STT, RTT, MGT, VCT.
3 NIT other, SDT other, BAT, ETT, EIT p/f other, EIT schedule actual and other
Table 5.2 PSI/SI playout table PID to queue assignment.
Table 5.3 shows the table PID to queue number assigment in the second level of prioritisation
in ATSC mode.
Player Queue Tables Corresponding PID Values
Player 1 PAT,CAT,PMT,TDT 0, 1, PMT*N, 20
Player 2 NIT, SDT 16, 17
Player 3 EIT 18
Table 5.2 shows the table PID to queue number assigment in the second level of prioritisation.
The actual priority of each of these queues can be configured, but the normal case would be to
use falling priority for these queues.
See Section 5.10 for a more details on PSI/SI/PSIP playout.
5.9.4 Output Priority Queue
The right hand part of figure 5.3 represents the TS packet output priority queue of the TSP. It
indicates that all data is prioritised before being output.
The CP525 generates a constant (configurable) output bitrate translating to a fixed number of
available packet slots per time unit. Data from different sources are mapped to the priority queue
on the output to compete for the available bandwidth according to the configured priority rules.
Some data sources have fixed priorities to assure proper behaviour; other data source priorities
are configurable. The ones that are configurable are framed with a darker grey rectangle within
the MUX symbol in
Figure 5.3 .
PID sources fall into the following different categories:
Table 5.4.a Priority queue categories.
Cat. Sub-
group
Name Description
A 1 MIP inserter packets If the CP525 is set to operate as an SFN adapter
and MIP packet transmission is configured, the MIP
packets are transmitted at fixed packet positions.
To assure exact positioning, these are transmitted
with highest priority.