Comtech EF Data DMD1050 - Manual (Page 67)

DMD1050 Satellite Modem Board Rear Panel Interface
MN-DMD1050 4–5
Revision 9
4.2 Compact Flash (J9)
The compact flash slot is located on the right side as viewed from the rear of the unit. A 256 Mbit
flash memory card stores all the modem M&C and operational data. It must be present when the
modem is operating.
4.3 Power Input (J7)
The Input DC Power for the modem board requires +21 to +24.5 Volts DC. Manufacturer part
number for this connector is referenced in Appendix E. Refer to Table 4-1 for pin out
descriptions.
Table 4-1 DC Input Power Ports (J7)
Pin No. Signal Name Signal
1 Ground GND
2 Ground GND
3 24 Volts DC ---
4 24 Volts DC ---
Table 4-1. Power Input Connector (J7)
4.4 Chassis Connections (Standard)
4.4.1 EXT REF (J8)
The External Reference Port is a 50 Ohm Female SMA Connector and will accept the following
frequencies: 1.0, 1.544, 2.0, 2.048, 5.0, and 10.0 MHz).
Input Level:
0.1 Vp-p to 5 Vp-p (Sine or Square wave)
4.4.2 TX L-Band IF (J1)
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.
4.4.3 RX L-Band IF (J2)
The Receive IF Input Port is a 50 Ohm SMA Female Connector that can be used for L-Band IF.
The IF Frequency can be programmed from 950 to 2050 MHz in 1 Hz Steps.