Definition of Terms - Digital Video and Audio Broadcasting Technology - page 563

Program Stream (PS)
Like the transport stream, the program stream is a multiplex stream but
only contains elementary streams for a program and is only suitable for the
transmission in 'undisturbed' channels (e.g. recording in storage media).
Program Specific Information (PSI)
The four tables below defined by MPEG-2 are summed up as program
specific information:
Program Association Table (PAT),
Program Map Table (PMT),
Conditional Access Table (CAT),
Network Information Table (NIT).
Quadrature Amplitude Modulation (QAM)
QAM is the modulation method used for transmitting a transport stream
via cable. The channel coding is performed prior to QAM.
Quadrature Phase Shift Keying (QPSK)
QPSK is the modulation method used for transmitting a transport stream
via satellite. The channel coding is performed prior to QPSK.
Rating Region Table (RRT)
The RRT is a PSIP table (ATSC). It comprises reference values for dif-
ferent geographical regions for the classification of transmissions (e.g.
'suitable for children older than X years'). RRT is transmitted with a sec-
tion in the PID 0x1FFB and indicated by the table_ID=0xCA.
Running Status Table (RST)
The RST is an SI table (DVB) and contains status information about the
individual broadcasts. It is transmitted in TS packets with PID 0x0013 and
indicated by table_ID=0x71.
Section
Each table (PSI and SI) may comprise one or a number of sections. A
section may have a length of up to 1 kbyte (for EIT and ST up to
4 Kbytes). Most of the tables have 4 bytes at the end of each section for the
CRC.
Service Description Table (SDT)
The SDT is an SI table (DVB) and contains the names of programs and
broadcasters. It is transmitted in TS packets with PID 0x0011 and indi-
cated by table_ID 0x42 or 0x46.
Service Information (SI)
The following tables defined by DVB are called service information.
They have the structure for 'private' sections defined by MPEG-2 systems:
Bouquet Association Table (BAT),
Service Description Table (SDT),
Event Information Table (EIT),
Running Status Table (RST),