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A.3.3 8-Channel Multiplexer Option
The multiplexer (MUX) system (Figure A-23) provides for 1 to 8 tributary channels to be
multiplexed onto a single aggregate carrier. Independent tributary data rates from
600 bit/s to 4000 kbit/s in 100 bit/s increments are supported. This option is used
primarily with the SDR-54 receiver.
The 8-Channel Mux PCB can be installed in the factory or in the field. This MUX PCB is
used in conjunction with a compatible I/O card to provide a 100-pin subminiature D style
connector located on the rear panel of the SDM-300A modem. Tributary and aggregate
data is available at this 100-pin connector. An optional breakout panel (UB-54) can be
used to provide eight separate 15-pin D connectors for individual tributary circuits and
one 15-pin D connector for auxiliary circuits.
A–74
Figure A-23. 8-Channel Multiplexer PCB (AS/5985)
SDM-300A Satellite Modem
Rev. 4
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