The MPEG Data Stream - Digital Video and Audio Broadcasting Technology - page 75

(STT), the Rating Region Table (RRT), and the Cable Virtual Channel Ta-
ble (CVCT) or the Terrestrial Virtual Channel Table (TVCT).
According to ATSC, the PSI tables defined in MPEG-2 and provided in
the MPEG Standard are used for accessing the video and audio streams,
i.e. the transport stream carries one PAT and several PMTs. The condi-
tional access information is also referenced via a CAT.
The actual ATSC tables are implemented as “private tables”. The Mas-
ter Guide Table, the main table, so to say, contains the PIDs for some of
these ATSC tables. The Master Guide Table can be recognized by the
packet ID = 0x1FFB and the table ID = 0xC7. The transport stream must
contain at least four Event Information Tables (EIT-0, EIT-1, EIT-2, EIT-
3) and the PIDs for these EITs are found in the Master Guide Table. Up to
128 further Event Information Tables are possible but are optional. An EIT
contains a 3-hour section of an electronic program guide (EPG). Together
with the 4 mandatory EITs, it is thus possible to cover a period of 12
hours. Furthermore, Extended Text Tables can be optionally accessed
through the MGT. Each existing Extended Text Table (ETT) is allocated
to one EIT. Thus, e.g. ETT-0 contains extended text information for EIT-
0. It is possible to have up to a total of 128 ETTs.

Table 3.4. PSIP tables

Table PID Table ID

Program Association Table (PAT) 0x0 0x0

Program Map Table (PMT) über PAT 0x2

Conditional Access Table (CAT) 0x1 0x1

Master Guide Table (MGT) 0x1FFB 0xC7

Terrestrial Virtual Channel Table (TVCT) 0x1FFB 0xC8

Cable Virtual Channel Table (CVCT) 0x1FFB 0xC9

Rating Region Table (RRT) 0x1FFB 0xCA

Event Information Table (EIT) über PAT 0xCB

Extended Text Table (ETT) über PAT 0xCC

System Time Table (STT) 0x1FFB 0xCD

In the Virtual Channel Table, which can be present either as Terrestrial
Virtual Channel Table (TVCT) or as Cable Virtual Channel Table (CVCT)
depending on the transmission path, identification information for the vir-
tual channels, i.e. programs, contained in a multiplexed transport stream
are transmitted. The VCT contains, among other things, the program
names. The VCT is thus comparable to the SDT table in DVB:
In the System Time Table (STT), all the necessary time information is
transmitted. The STT can be recognized by the packet ID = 0x1FFB and
the table ID = 0xCD. In the STT, the GPS (Global Positioning System)