The MPEG Data Stream - Digital Video and Audio Broadcasting Technology - page 61

and, finally, the “stuffing table” (ST). These eight tables will now be
described in more detail.

PAT Program Association Table
PMT's Program Map Table
CA T C onditional A ccess T able
(NIT) Network Information Table
Private Sections / Tables

MPEG2 PSI
Program Specific
Information

NIT Network Information Table
SDT Service Descriptor Table
BAT Bouquet Association Table
EIT Event Information Table
RST Running Status Table
TDT Time&Date Table
TOT Time Offset Table
ST

DVB SI
Service
Information

Stuffing Table

Fig. 3.29. MPEG-2 PSI and DVB SI

NIT
Network Information Table
(PID=0x10, Table_ID=0x40/0x41)

Information about
physical network
(satellite, cable, terrestrial)

Netzwork provider name,
transmission parameter
(RF, QAM, FEC)

Fig. 3.30. Network Information Table (NIT)

The “network information table” (NIT) (Fig. 3.30., Fig. 3.31., Fig.
3.32.) describes all physical parameters of a DVB transmission channel. It
contains, e.g. the received frequency and the type of transmission (satellite,
cable, terrestrial) and also all the technical data of the transmission, i.e. er-
ror protection, type of modulation etc.. This table has the purpose of opti-
mizing the channel scan as much as possible. A set-top box is able to store
all the parameters of a physical channel when scanning during setup, and it