Comtech EF Data CDM-500 - Manual (Page 19)

Installation CDM-500 Closed Network Satellite Modem
2–2 Rev. 1.3
Note that the CDM-500 is very light - under 7 lbs (3.2 kgs), and very short – 12 ins (305
mm). For this reason, it has not been designed to have rack slides mounted to the side of
the chassis. However, Comtech recommends that some method of support within the rack
should be employed, such a rack shelves. If the user is any doubt, please consult the
factory.
2.2 Configuration
There are no internal jumpers to configure, no interface cards to install, and no other
options to install. All configuration is carried out entirely in software. The unit should
first be configured locally, using the front panel keypad and display. The unit will ship
with a default 64 kbps, QPSK, Rate 1/2 configuration. Please refer to the ‘FRONT
PANEL OPERATION’ section for details on how to fully configure the unit for the
desired operating parameters.
The auto-sensing AC power supply does not require any adjustments. Simply plug in the
supplied line cord, and turn on the switch on the rear panel.
2.3 Select Internal IF Loop
Correct operation of the unit may be verified rapidly, without the need for
externally connected equipment. From the top level menu, select TEST, then IF
LOOP (refer to the ‘FRONT PANEL OPERATION’ section) The demod should
synchronize, and the green RECEIVE TRAFFIC LED should illuminate. If the unit
does not pass this test, call the factory for assistance.
2.4 Connect External Cables
Having verified correct operation in IF loop, the user should now enter his desired
configuration, and proceed to connect all external cables. If difficulties are experienced,
please call the factory for assistance.
Please note that the modulator gives an output power level in the range 0 to –20 dBm,
and the demodulator expects to see a signal in the range -30 to -60 dBm.