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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
C
ABLE
O
UTPUT
Each COFDM output module has two 75Ω F connectors which carry up to four frequencies.
3.5.5
MPEG-2/4
SD/HD
SDI
D
ECODER
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, result
ing 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
C
OMPOSITE
D
ECODER
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: