2.4 Description
The twin transmodulator cassette is a QPSK-converter, which converts all sta-
tions modulated according to DVB-S standard and QPSK into two QAM-modu-
lated cable signals. The cassette has two digital SAT IF inputs and an HF output.
It is equipped with two channel strips (“
A
” and “
B
”). Each channel strip consists
of a digital tuner, a digital signal preparation unit and a modulator.
The prepared input signals reach the HF output collector of the head-end station
via the HF output socket. The common output level of the channel strips can be
set at the output collector of the head-end station.
Two 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. Additionally the quality of the data stream received is displayed
(“
CN…
”).
The output symbol rate is fixed to a value of 6900 kSymb/s. If the symbol rate
being transmitted exceeds this value change to a high-order modulation (e.g.
from 64 QAM to 256 QAM).
When the head-end station is switched on, the two-line LC display shows the
software version of the control unit.
To operate this cassette the software version of the control unit must be “
V 37
”
or higher. You can find the current operating software for the control unit and
the cassette, the software “
BE-Flash
” and the current assembly instructions on the
website “
www.gss.tv
”.
The cassette is designed for use in the following head-end stations:
– STC
1200
– STC
316
– STR
19-8
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 37
” appears.
