2.5 Software query
Control unit
If necessary, you can activate the indication of the software version of the con-
trol unit manually:
• Press any two keys on the control unit of the head-end station simultaneously
until the display goes dark and the software version, e.g. “
V 40
” appears.
Cassette
After activating the cassette the software version of the cassette is displayed (s.
page 19).
2.6 How the TPS module works
After decoding QPSK- or 8PSK-modulated signals, the demodulated trans-
port stream can be accessed via the integrated TPS module. This transport
stream, also called data stream, contains several services with the appropriate
data components (video, audio, data and service information), which can be
changed using the TPS module.
In the station filter services can be deleted. This reduces the output data rate.
Additionally services of the different transport streams can be assembled to a
new transport stream.
The transport stream contains data in the form of tables which the receivers
evaluate and require for convenient use. The TPS module can adjust the “Net-
work Information Table” (NIT) to accommodate the new service data. The “NIT”
contains data which is required by the set-top boxes for the automatic search
feature.
Some network operators transmit an operator ID in the transport stream (e.g.
visAvision). By changing the CAT the operator ID can be adjusted to the de-
mands.