Comtech EF Data DST - Manual (Page 54)

Digital Satellite Terminal System Revision 1
Operation MN/DST.IOM
5–2
5.1.2 Initial Power Up – Modem Only
Initially, the modem is set up and checked out and not connected to the IFL cables:
Note: Refer to the specific modem manual for programming information.
Set the modem for a known operating configuration. This includes some of the steps that
follow.
Step
No.
Selection / Programming
Menu Location
3. Disconnect the L-Band TX and RX cables from the modem. Not Applicable (NA)
4. Connect prime power to the modem. NA
5. Allow modem to complete initialization. NA
6. ODU Power = OFF Configuration: Modulator
7. Modem Transmitter = ON
(Transmitter ON (Green LED) at front panel LED is On)
Configuration: Modulator
8. LNB Power = OFF Configuration: Demodulator
9. IF Loopback = ON (Test Mode LED turns ON). This matches the L-Band
demodulator frequency to the L-Band modulator frequency.
Ensure the Mod Spectrum (Inversion) matches the Demod Spectrum
(Inversion). This is required for the demodulator to lock. See
comments in the paragraph on LO, Mix and Spectrum for loopback
over satellite (RF Loopback).
Configuration: Demodulator
Utility: Modulator
Utility: Demodulator
10. Verify the carrier is locked. (Carrier Detect LED is Green at front panel) Front Panel
11. Make sure all faults are resolved before going forward. Front Panel LEDs and LCD
Faults/ Alarms
12. IF Loopback = Off (Test Mode LED turns Off). Configuration: Demodulator