Comtech EF Data SDM-300A - Manual (Page 321)

15–1
Chapter 15. Flex Mux
15.1 Introduction
Flex Mux (Figure 15-1) 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 kbps) or
T1 (1544 kbps) 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.
• 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
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 EF
Data:
• SMS-7000 switch
• SMS-301 switch
• UB-300 universal breakout panel (UB-530 is not compatible)
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.