Comtech EF Data SDM-300A - Manual (Page 93)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–15
4.1.9 External Reference (CP3)
CP3 is a BNC connector for an external reference. The input impedance is 75 Ω. For normal
operation, the reference signal is ≥ 0 dBm.
Valid External Reference frequencies are 1, 5, 10, and 20 MHz.
4.1.10 Power Entry
4.1.10.1 AC Power Connector
A standard, detachable, non-locking, 3-prong power cord (IEC plug) supplies the Alternating
Current (AC) power to the modem. Observe the following:
Input Power 55W maximum, 40W typical
Input Voltage 90 to 132 or 175 to 264 VAC
Unit switches ranges automatically
Connector Type I.E.C
Fuse Protection 1A slo-blo
Line and neutral fusing
5 mm type fuses
4.1.10.2 48VDC Option
Specifications include:
Input Power 55W maximum, 40W typical
Input Voltage 38 to 64 VDC
Connector Type 20A, 3 screw terminal block
Fuse Protection 2A slo-blo
4.1.11 Ground Connector (GND)
A #10-32 stud on the rear panel of the modem is used for connecting a common chassis ground
among all equipment.
Note: The AC power connector provides the safety ground.