DMG 3200/3100/3000 – User Manual
Page 153 (306)
7.4.5 QAM Output Module
Unlike other modules, the QAM module’s Port Settings tab is not modifiable as the parameter
values are set under Outputs
QAM
Device setup.
Although the QAM output has two physical outputs, it carries up to sixteen transport streams.
Internally these streams are modulated by four block QAM modulators each carrying up to four
channels.
The RF connectors on the output are configured as such: the first two block modulators A and
B, output on the port marked as A+B, the last two block modulators C and D output on the port
marked as C+D.
The configuration of the QAM modulator parameters is available in a separate node in the
Navigation Pane, called Device Setup, which is beneath each QAM output node.
The QAM module supports the ITU-T J.183/JCTEA standard where output several transport
streams can be multiplexed into one transport stream using Time Division Multiplexing (TDM).
Currently, this standard is supported for transparent streams only. To enable J.183/JCTEA
support, simply click the corresponding check box.
Figure 7.42 - Device Setup Node
When Device Setup is selected, both modulators can be configured from the resulting dialog.
The figures below show the Device Setup node for Annex A/C and Annex B QAM modulators;
correct values for these parameters can be obtained from respective network operators.
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