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Maintenance
5.2.2
Faults/Alarms Display
General fault, status, and alarm information are indicated by 10 LEDs located on the
modem's front panel.
A fault (red LED) indicates a fault that currently exists in the modem.
When a fault occurs, it is stored in the stored fault memory, and indicated by the single
yellow LED.
The LED is turned off when the fault clears. If the fault clears, the occurrence is also
stored.
A total of 10 occurrences of any fault can be stored. Each fault or stored fault indicated
by a front panel LED could be one of many faults. To determine which fault has
occurred, use the Fault or Stored Fault front panel menu. Refer to
information on the Fault or Stored Fault front panel menu.
Alarms are considered minor faults, which will not switch the modem offline in a
redundant system. Alarms are shown in the Fault or Stored Fault front panel menu by a
reversed contrast (white on black) character that appears at the display panel.
5.2.3
Faults/Alarms Analysis
This section describes the possible problems and actions to take for the following faults:
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•
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5–12
Modulator
Demodulator
Transmit interface
Receive interface
Common equipment
Backward alarm
SDM-300A Satellite Modem
Chapter 3
for
Rev. 4
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