Comtech EF Data DMDVR20 LBST Rev 1.1 - Manual (Page 18)

DMDVR20 LBST Satellite Modem Installation
TM136 – Rev. 1.1 2-3
Should the Power Cable/AC Connector be of the wrong type for the installation, either the cable
or the power connector end should be replaced. The power supply itself is designed for universal
AC application. See specifications for appropriate voltages and currents.
2.3 Mounting Considerations
When mounted in an equipment rack, adequate ventilation must be provided. The ambient
temperature in the rack should preferably be between 10
° and 35°C, and held constant for best
equipment operation. The air available to the rack should be clean and relatively dry. The
modems may be stacked one on top of the other to a maximum of 10 consecutive units before
providing one (1) RU of space for airflow. Modems should not be placed immediately above a
high-heat or EMF Generator to ensure the output signal integrity and proper receive operation.
Do not mount the in an unprotected outdoor location where there is direct contact with rain, snow,
wind or sun. The only tools required for rack mounting are four (4) customer supplied rack-
mounting screws and the appropriate screwdriver. Rack mounting brackets are an integral part of
the front bezel of the unit and are not removable.
2.4 Initial Configuration Check
The modem is shipped from the factory with preset factory defaults. Upon initial power-up, a user
check should be performed to verify the shipped modem configuration. Refer to Section 4, User
Interfaces to locate and verify that the following configuration settings are correct:
The Interface Type (V.35, RS-422, RS-232, etc.) MUST be selected from the
Front Panel BEFORE the mating connectors are installed. Failure to do so
may cause damage to the Universal Interface Module. Power up the
modem, select the appropriate interface type, and then install the mating
connectors.
Transmit (Tx) and Receive (Rx) Interface types are dependent upon the
customer’s order.