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HDMU 790 C
2.4 d
esCription
The Digital Transmodulator module "HDMU 790 C", in the following called
"module" converts four ISDB-T, DVB-T2/T/C modulated data streams into four
QAM modulated data streams. The module has one DVB-C/T/T2 resp. ISDB-T
input, one ASI input and one RF output.
The module is equipped with four channel strips ("
A
" … "
D
"). For each channel
strip tuner or ASI input can be selected. The channel strips consist of the digital
tuners, the digital signal processing units and an output converter.
Using adequate CA modules scrambled channels can be descrambled via
channel strips "A" and "C".
Tuner "
A
"
ASI IN
RF OUT
Tuner "
D
"
TPS
TPS
TPS
TPS
CA-Modul
CA module
CA-Modul
CA module
Tuner "
B
"
Tuner "
C
"
Modulator
"
A
"
Modulator
"
B
"
Modulator
"
C
"
Modulator
"
D
"
Combiner
Bx 4
0 x ASI
ASI
OFF
DVB-C/T/T2,
ISDB-T
IN
"
A
"
For the modulators of channel strips A/B resp. C/D adjacent channel setting is
fixed.
Status LEDs
Channel strip A
Channel strip B
Channel strip C
Channel strip D
Four LEDs indicate if the respective channel strip is
switched on (LED illuminates) 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 de-
modulated transport streams.
The QAM modulated RF output signals are sent
through the RF output of the module to the output
collector (retrofittable accessory) of the head-end
station.
