Deviser S7200 User Manual page 69

6-12.6 Program List
transport stream, so users can easily find the channel and program of corresponding frequencies. During
troubleshooting, the field engineer can more easily identify which QAM carrier to focus on based on the
particular program complaint from the customer.
A program list can be saved in the instrument's memory, so that the next time the instrument is powered on,
users can directly recall the program list by pressing Start again. Note that the stored list will overwrite the
old list, even if the new list has not yet completed initialization.
6-12.7 PSI/SI Table Analysis
"Program Specific Information" (PSI) is similar to the program list described above. The PAT has a PID of zero
and begins with a table ID of zero. The PMT has the PIDs defined in the PAT as PID and has a table ID of 2.
The CAT has a PID and a table ID of 1 in each case. The PSI can be composed of one or more transport
stream packets for PAT, PMT and CAT depending on content.
Apart from the PSI tables PAT, PMT and CAT, another table, the "network information table" (NIT) is provided
in principle but not standardized in detail. It was actually implemented as part of the DVB (Digital Video
Broadcasting) project.
All tables are implemented through the mechanism of sections. There are non-private sections, which are
defined in the original MPEG-2 Systems Standard, and private sections, which include all others. Non-private
sections include the PSI tables, while the private ones include the SI sections of DVB which are used for data
broadcasting. The header of a table contains the version number of a table and information about the
number of sections that make up a table.
Taking advantage of the "private section" and "private table" features,
the European DVB Group has introduced numerous additional tables
intended to simplify the operation of the set-top boxes or quite generally
of the DVB receivers. Called "service information" (SI), they are defined
in ETSI Standard ETS300468. These include the following tables (right).
Lists all programs in the current transport network by
ascending frequency. Info includes program number,
frequency, SID, service name, CA, provider, and service
type. Depending on the encoding method, the program
information may be displayed differently; you might see the
program information of the selected frequency, or the
program information of all frequencies. The CA may be
different from the real-time and PROG INFO subfunctions, as
they acquire the CA value differently.
The CA of this subfunction is retrieved directly from the
Part II: Settings and Measurements
69