GSS HMPT 1000 C, Инструкция по сборке

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- 10 - HMPT 1000 C
2.5 s
oft ware query
Control unit
If necessary, you can activate the indication of the software version of the
control 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 45 " appears.
Cassette
After activating the cassette the software version of the cassette is displayed
(see. page 22).
2.6 h
ow the
tPs
module works
After decoding QPSK- or 8PSK-modulated signals, the demodulated data
stream can be accessed via the integrated TPS module. This data stream,
also called transport stream, contains several stations in all their components
(video, audio, data and service information), which can be changed using the
TPS module.
s
tation filter
Individual stations can be deleted. This reduces the data rate and, conse-
quently, the output symbol rate required. Additionally stations of the different
transport streams can be assembled to a new transport stream.
s
tuffing
The transport stream is padded using what is known as zero data. This ensures
a steady and constant output symbol rate.
C
hanging the
nit
The transport stream contains data in the form of tables which the receiv-
ers evaluate and require for convenient use. The TPS module can adjust the
"Network Information Table" (NIT) to accommodate the new station data. The
"NIT" contains data which is required by the set-top box for the automatic
search feature.
C
hanging the oPer ator
id (Cat)
Some network operators transmit an operator ID in the data stream (e.g.
visAvision). By changing the CAT the operator ID can be adjusted to the de-
mands.