Product Description - Televes T.0X 565301 User Manual

6. Product description

6.1. Introduction
The HDTV TRANSMODULATOR - Dual ATSC/QAM
to QAM allocates the information contained in two
independent input multiplexes (ATSC or 64/256
QAM annex B modulations) in two completely
independent cable channels in the 57 to 1002MHz
range (Ch 2 to 159). Both QAM annex A and annex
B are supported for the output modulation.
The digital transmodulation process starts with
the demodulation of the input signals to obtain
the MPEG2 transport streams which are then
remodulated into QAM format.
In transparent mode each QAM output signal
is the same as the corresponding input ATSC or
QAM signal, except for baud rate adaptation. In
processing mode limited edition is possible in the
PSIP information (service name and virtual channel
number). In multiplexing mode, in addition toi
PSIP edition, each input service can be directed to
any of the two outputs or eliminated.
The HDTV TRANSMODULATOR - Dual ATSC/QAM
to QAM features two F-type input connectors
allowing a loop through output to daisy-chain the
whole subrack, thus avoiding the use of an external
splitter. The input signal feeds both tuners.
Two output RF connectors are also available, the
bottom one is the QAM output and the top one is
the QAM input (loop-through) that allows to mix
the output signal of previous modules installed in
the same subrack.
The RF loop-through can be disabled to obtain an
increased output level (+13dB typ).
The universal Programming Unit (ref. 7234) is used
to program the operating parameters of the HDTV
TRANSMODULATOR - Dual ATSC/QAM to QAM unit.
6.2. Front panel elements description
The next figure shows the location of all the ports,
status and alarm indicators, existing in the front on
the unit.
Side view
Connector 1 is the ATSC/QAM input F connector.
Connector 2 is the output loop-through of the
input signal.
Connector 3 is the daisy chain QAM input from a
previous QAM output.
Connector 4 outputs the combined QAM output.
Loop-through losses are very low allowing to
combine the output of all the units in a subrack.
1. ATSC/QAM input
2. ATSC/QAM loop-through output
3. RF QAM input (loop-through input)
5
4. RF QAM output (loop-through output)
8
5. Power bus connectors
6
6. Control bus connectors
7. Computer/Programmer connector
9
10
8. Temperature status LED
11
7
9. IN(PUT) A status LED
12
10. QAM A output status LED
11. IN(PUT) B status LED
12. QAM B output status LED
Front view
11
EN