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Connections
SAT inputs A and B: 2 F sockets
HF output (modulators): 1 IEC socket
Connection strip (10-pin): for supply voltages and control circuits
Socket RS 232: serial interface for software update
Conditional access: 2 channels can be decoded
2.4 Description
The twin transmodulator cassette is a QPSK-converter, which converts all sta-
tions modulated according to DVB-S
1
standard and
QPSK
2
into two PAL-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 channel strip “A” can decode encoded channels via a corresponding CA
module. Depending on the CA module and the smart card, two channels can be
decoded simultaneously with one CA module, with the second one supplied via
channel strip “B”. The control of the
cassette
takes place via the control unit of
the head-end station. By means of the “a” and “b” levels of the channel strips,
channel selection according to a timer is possible.
The
cassette
‘s channel strips
are indicated by
“Bx A / Bx a“ or “Bx B / Bx b”
(“
Bx a
” / “
Bx b
” – time controlled
channel switch over)
in the control unit display.
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 with the level regulator at the output collector of the head-end station.
When the head-end station is switched on, the two-line LC display briefly 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 316
– STC 1200
– STR 19-8
1
DVB-S – Digital Video Broadcasting - Satellite
2
QPSK – Quadrature Phase Shift Keying