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CGT 660
2.4 d
esCription
The Digital Modulator CGT 660, in the following called COFDM-QAM module
converts two COFDM-modulated data streams into two QAM-modulated data
streams. The COFDM-QAM module has two HF inputs, one HF output and 2
loop-through outputs.
The COFDM-QAM module is equipped with two channel strips ("
A
" and "
B
").
The channel strips consist of the digital tuners, the digital signal processing lev-
els and an output converter. The channel strips are indicated in the head-end
station display with "
Bx …A
" and "
Bx …B
". Using an adequate CA module
encoded channels can be decoded via channel strip "
A
". The control of the
module takes place via the control unit of the head-end station.
Two 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. This enables service information
(NIT – Network Information Table) to be changed, data rates to be increased
(stuffing) and stations to be deleted from the transport stream (thus optimising
bandwidth for the other stations being transmitted). In addition, the operator
ID (required for e.g. visAvision) can be set.
The HF output signals are sent through the HF output of the COFDM-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.
The COFDM-QAM module operating software 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 COFDM-QAM
module, the software "
BE-Flash
" and the current assembly instructions on the
website "
www.triax.com
".
To operate the COFDM-QAM module the
software version of the control unit
must be "
V 10
" or higher.
The COFDM-QAM module is designed exclusively for use in the CSE 2800
head-end station.
