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2.4 d
e s C r i p t i o n
The Head-end Digital Transmodulator QAM "CGS-2 764 C", in the following
called QAM module converts four DVB-S/DVB-S2 modulated data streams into
four DVB-C (QAM) modulated data streams. The QAM module has two SAT-IF
inputs and one RF output.
The QAM module is equipped with four channel strips ("A" ... "D"). The chan-
nel strips consist of the digital SAT tuners, the digital signal processing levels
and an output converter. For channel strips A/B resp. C/D adjacent channel
setting is fixed.
Using adequate CA modules scrambled channels can be descrambled via
channel strips "A" and "C". The control of the module takes place via the con-
trol unit of the head-end station.
Four LEDs indicate if the respective channel strip is switched on (LED illumi-
nates) or off, and also provide an indication of the signal quality based on their
colour.
The integrated TPS module (Transport Stream Processing) processes the data
from the demodulated transport streams.
Channel as well as frequency setting is possible for modulators "A" and "C".
The modulators "B" and "D" work at a spacing of + 8 MHz to modulators"A"
and "C". Herein only frequency setting (frequency spacing of channel strips
"A <–> B" and "C <–> D") is possible to reduce the bandwidth at signals of
low data rates.
The QAM modulated RF output signals are sent through the RF output of the
QAM module to the output collector.
When the head-end station is switched on, the two-line LC display shows the
"SETUP" menu and the software version of the control unit. The head-end sta-
tion output level can be adjusted in this menu.
To operate the QAM module the software version of the control unit (head-end
station) must be "V 10" or higher. The operating software of the QAM module
and the head-end station can be updated using a PC or notebook and the
software "BE-Flash" via the 9-pin D-SUB socket on the head-end station. You
can find the current operating software for the head-end station and the QAM
module, the software "BE-Flash" and the current assembly instructions on the
website "www.triax.com".
The QAM module is designed exclusively for use in the CSE 2800 head-end
station.
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CGS-2 764 C
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