TANDBERG Voyager E5784, Справочное руководство

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Use of Remux Card in ATSC
Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder Page H-3
ST.RE.E10137.3
H.1 Remux Card In ATSC With Internal PSIP
The Encoder automatically remuxes ATSC streams arriving at its inputs, as
in DVB. The Encoder uses the PAT (Program Association Table) and PMT
(Program Map Table) to work out all the associated PIDs (Packet
Identifier), and attempt to extract the short name, the long name, and the
Service Type from the VCT (Virtual Channel Table).
NOTE…
If more than one program is present on any input the Encoder may be unable to extract any
information from the VCT on that input.
The Encoder then maps the PIDs using the program paradigm based upon
the program number. If possible, the program number of the input is
preserved. In Intelligent mode the Encoder automatically remaps the
program number/PIDs if a clash occurs. If an active program is overwritten
by another, the program number/PIDs of the first program are changed to
non-clashing values. In Dumb mode the Encoder requires a user to remap
clashing program numbers/PIDs to prevent overwriting an active program.
The Encoder generates all PSIP (Program System Information Protocol)
tables for the output stream. It generates a minimum set of tables
containing a minimum amount of data. The tables constructed are the:
•
MGT (Master Guide Table)
•
CVCT (Cable Virtual Channel Table) or
•
TVCT (Terrestrial Virtual Channel Table)
•
STT (System Time Table)
•
RRT (Rating Region Table)
•
EIT (Event Information Table) 0, 1, 2, and 3
•
PAT
•
CAT (Conditional Access Table)
•
PMT
The program paradigm is applied to any input program which has a
program number of less than 256. If the program number is greater than
255 any PID may be used for each stream. If a non-ATSC service is
detected then that may also be passed through the Remux card as an
ATSC program. The program paradigm will be applied to such a service if
possible and if the program number is less than 256.
H.2 Remux Card In ATSC With External PSIP
The Encoder only provides a minimum amount of information within the
PSIP tables. If more sophisticated tables are required then the PSIP may
be fed in externally using an ASI input on the Remux card. The user is able
to specify a PID range via a minimum and maximum PID. The user then
selects a port to use and chooses a Service Info level of ‘On (Ext. PSIP)’.
All PIDS between the maximum and minimum are then mapped directly to
the output.