Alarm Masks; Active Alarms; Major Alarms; Minor Alarms - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Univeral Satellite Modem
6.4

Alarm Masks

The DMD2050E self-monitors and isolates faults. Alarms for these faults are categorized as:

Active Alarms


Common Equipment Alarms

Backward Alarms

CAUTION
Masked alarms can cause unwanted effects in the performance of the unit.
You can mask certain alarms. Masking alarms can be helpful during debugging, or when you
need to to lock out a known failure.
When an alarm is masked, the front panel LEDs and the Fault Relays are not activated, but the
Alarm is shown in the display.
6.4.1 Active Alarms
6.4.1.1

Major Alarms

If a major alarm is on constantly, the modem has a hardware failure.
A major alarm flashes briefly during configuration changes and power-up. No action is
necessary.
Alarms are grouped into transmit and receive alarms. Transmit and receive alarms are completely
independent of each other.
6.4.1.2

Minor Alarms

Minor alarms show that a problem exists outside of the modem. Examples of such problems are:
Loss of terrestrial clock
•
Loss of terrestrial data activity
•
Transmit or receive AIS condition
•
MN-DMD2050E Revision 2
Maintenance and Troubleshooting
6–8