Comtech EF Data DM240XR - Manual (Page 19)

DM240XR High-Speed Digital Modulator Installation
MN-DM240XR– Revision 13 2–3
Shielded cables with the shield terminated to the conductive backshells are required in order to
meet EMC directives. Cables with insulation flammability ratings of 94 VO or better are required
in order to meet low voltage directives.
2.5 Modulator Checkout
The following descriptions assume that the DM240XR is installed in a suitable location with
prime AC power and supporting equipment available.
2.5.1 Initial Power-Up
CAUTION
Before initial power up of the DM240XR, it is a good idea to disconnect
the transmit output from the operating ground station equipment. This is
especially true if the current modulator configuration settings are
unknown, where incorrect setting could disrupt existing communications
traffic. New units from the factory are normally shipped in a default
configuration which includes setting the transmit carrier off.
Turn the unit ‘ON’ by placing the rear panel switch (above the power entry connector) to the
‘ON’ position. Upon initial and subsequent power-ups, the DM240XR microprocessor will test
itself and several of its components before beginning its main Monitor/Control program. These
power-up diagnostics show no results if successful. If a failure is detected, the Fault LED is
illuminated.
The initial field checkout of the DM240XR can be accomplished from the front panel, Terminal
Port, Remote Port, or Ethernet Port.