Modulator Checkout; Initial Power-Up - Comtech EF Data DMD50 Installation And Operation Manual

DMD50 Universal Satellite Modem
To lock up the modem, enter 'IF Loopback Enable' under the Test Menu, or connect a Loopback
Cable from J11 to J13 on the rear panel of the modem.
2.5

Modulator Checkout

The following descriptions assume that the unit is installed in a suitable location with prime AC
power and supporting equipment available.

2.5.1 Initial Power-Up

Before initial power up of the unit, it is a good idea to disconnect the
transmit output from the operating ground station equipment.
especially true if the current Modulator Configuration Settings are
unknown,
communications traffic. New units from the factory are normally shipped in
a default configuration which includes setting the transmit carrier off.
Turn on the unit by placing the Rear Panel Switch (located above the power entry connector) to
the On Position. Upon initial and subsequent power-ups, the 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 will illuminate.
The initial field checkout of the modem can be accomplished from the Front Panel or in the
Terminal Mode. The Terminal Mode has the advantage of providing full screen access to all of
the modem's parameters, but requires a separate terminal or computer running a Terminal
Program. The Terminal Mode is enabled from the front panel in the System M&C Submenus.
MN-DMD50– Revision 3
where incorrect settings
CAUTION
could disrupt
Installation
This is
the existing
2–5