The MPEG Data Stream - Digital Video and Audio Broadcasting Technology - page 69

evaluated, and to what extent. Complete support for this broadcast time in-
formation would require the set-top box to be informed of its current loca-
tion and in a country having a number of time zones such as Australia, es-
pecially, more attention should be paid to this point.
It may sometimes be necessary to cancel certain information, especially
tables in the transport stream. After a DVB-S signal has been received in a
CATV head station, it can quite easily happen that, e.g. the NIT must be
exchanged or overwritten or that individual programs must be rendered
unusable for relaying. This can be done by means of the “stuffing table”
(ST) (Fig. 3.44.) which enables information in the transport stream to be
overwritten.
Service_ID
Transport_stream_ID
Event_ID
Start Time &
Duration
Fig. 3.40. Event Information Table (practical example)
RST
Running Status Table
(PID=0x13,Table ID=0x71)
Current status of a
event
Fig. 3.41. Running Status Table (RST)