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Digital Satellite Terminal System
Operation
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.
3.
Disconnect the L-Band TX and RX cables from the modem.
4.
Connect prime power to the modem.
5.
Allow modem to complete initialization.
6.
ODU Power = OFF
7.
Modem Transmitter = ON
(Transmitter ON (Green LED) at front panel LED is On)
8.
LNB Power = OFF
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).
10.
Verify the carrier is locked. (Carrier Detect LED is Green at front panel)
11.
Make sure all faults are resolved before going forward.
12.
IF Loopback = Off (Test Mode LED turns Off).
Selection / Programming
5–2
Revision 1
MN/DST.IOM
Menu Location
Not Applicable (NA)
NA
NA
Configuration: Modulator
Configuration: Modulator
Configuration: Demodulator
Configuration: Demodulator
Utility: Modulator
Utility: Demodulator
Front Panel
Front Panel LEDs and LCD
Faults/ Alarms
Configuration: Demodulator
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