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Data from backplane
MOD 1
MOD 2
MOD 3
MOD 4
QAM Modulator board
The QAM modulator consists of
four modulator chips, each
carrying up to 4 carriers. The
frequency is set only for the first
carrier of each modulator. The
remaining three carriers per
modulator follow regular spacing.
3.5.4 COFDM CABLE OUTPUT
Each COFDM output module has two 75Ω F connectors which carry up to four frequencies.
3.5.5 MPEG-2/4 SD/HD SDI DECODER
The MPEG-2/4 SD/HD decoder enables decoding in either MPEG-2 SD/HD or MPEG-4 AVC SD/HD format. The
module has two outputs that can be either SDI or HD-SDI with embedded audio and VBI.
It is possible to configure the decoder’s channel B to route its audio outputs to channel A, resulting in channel A
(the first two output ports) having the video stream along with four different audio tracks. Channel B will then
have no output.
There are two steps involved to obtain this configuration:
On the module itself, set dip switch 6 to on.
In the GUI, set Input Source for both Output A and B to the same video stream.
To run HD content, a pair of HD/SDI approved BNC connector and cable is necessary.
3.5.6 MPEG-2/4 SD/HD COMPOSITE DECODER
The MPEG-2/4 SD/HD decoder enables decoding in either MPEG-2 SD/HD or MPEG-4 AVC SD/HD format. The
module has two composite BNC outputs for video and one HD DSUB 26 male connector for audio. The pin-out
for this is as follows:
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