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SDM-300A Satellite Modem
A.3.4 Flex Mux
Flex Mux (Figure A-25) PCB is offered as a factory or field installable interface.
Simultaneous operation of a main data channel and three overhead channels are
supported. The main data channel is a G.703 type electrical interface at E1 (2048 kbit/s)
or T1 (1544 kbit/s) terrestrial data rate and supports both pass through and D&I modes of
operation. AUPC, ASYNC data and voice channels are supported in the three overhead
channels.
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Flex Mux is designed to plug into the base board of the modem at two internal interfaces,
and provide a single 50-pin "D" sub-connector at the rear of the modem to replace the
non-overhead 25-pin connector. The particular overhead configuration of the PCB is
determined by software control via the front panel.
Connection to external terrestrial equipment is supplied through a 50-pin "D" sub-
connector located at the rear of the modem. The unit is compatible with the Comtech
EFData:
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A 96-pin DIN connector and a 30-pin DIP header supply interface to the internal circuitry
of the base modem. These connectors provide data flow, control, status and power
between the modem and the unit.
User control and status monitoring of the unit via the front panel or the EIA-232 or
EIA-485 remote port (J6) located on the back of the modem.
Refer to the following tables for system specification:
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Note: The Flex Mux Channel 1, D&I, will operate with other modems set-up for D&I as
long as Channels 2, 3, and 4 are Off.
Rev. 4
Channel (Main Data) # 1: G.703 E1 or T1
Channel (Overhead) # 2: ADPCM (Audio)
Channel (Overhead) # 3: EIA-232, EIA-422, or AUPC
Channel (Overhead) # 4: EIA-232, EIA-485 or AUPC
SMS-7000 switch
SMS-301 switch
UB-300 universal breakout panel
Table A-23. System Specifications
Table A-24. Multiplexer Specifications
Table A-25. Demultiplexer Specifications
Options
A–79
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