TANDBERG E5780, Справочное руководство

Страница: 271 / 298

Use of Remux Card in ASTC
Reference Guide: evolution 5000 E5780 and E5782 Encoder Page H-3
ST.RE.E10135.4
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.
In this configuration the Encoder generates the PAT, CAT and PMT for all programs but it is
the responsibility of the user to provide all the PSIP for the associated programs. Any
programs present on the same input as the external PSIP are not detected and are not
referenced in the PAT.
This mode may be also be used for passing data through the Remux card.