Specifications

DMD20/20LBST Universal Satellite Modem Rear Panel Interfaces
MN-DMD20-20LBST Revision 14 5–4
5.2 Compact Flash
The compact flash slot is located on the right side as viewed from the rear of the unit. A 128 or
256 Mbit flash memory card that stores all the modem M&C and operational data. It must be
present when the modem is operating.
5.3 Power Input Modules
5.3.1 AC Power Input Module
AC Input Module (Figure 5-1) is located on the left side of the unit. Power applied to the port with
the supplied power cable is 100 – 240 VAC, 50 – 60 Hz. Integrated into the Power Input Module
is the Power On/Off Rocker Switch. Power consumption for the unit is 1A. A chassis ground
connection (#10-32 threaded stud), is located to the lower right of the module .5.2.2 DC Power
Input/Switch
The Optional DC Power Input and Switch (Figure 5-1) is available for all DMD20/DMD20 LBST
products. The unit may be powered from a 36 – 75 VDC source with a maximum unit power
consumption of 3 A. Refer to Table 5-1 for pinouts.
Table 5-1. DC Power
A –
B Ground
C +
5.4 DMD20 Chassis Connections (Standard)
5.4.1 EXT REF (J10)
The External Reference Port is a 50-Ohm Female BNC Connector and will accept the following
frequencies: 1.0, 1.544, 2.0, 2.048, 5.0, and 10.0 MHz.
5.4.2 TX IF (J11)
The Transmit IF Output Port is a 75-Ohm Female BNC Connector that is used for 70/140 MHz IF.
The power level is programmable from 0 to -25 dBm in 0.1 dBm steps. The IF Frequency can be
programmed to 50 – 90 MHz or 100 – 180 MHz, in 1 Hz Steps.
5.4.3 TX L-Band IF (J12)
The Transmit IF Output Port is a 50-Ohm SMA Female Connector that can be used for L-Band IF.
The power level is programmable from 0 to -25 dBm, in 0.1 dBm steps. The IF Frequency can be
programmed to 950 – 2050 MHz, in 1 Hz Steps.