Radyne OM20 Specifications download pdf (Page 72)

DMD1050 Satellite Modem Board Maintenance and Troubleshooting

�

Active Alarms

� Common Equipment Alarms

A feature exists that allows the user to ‘Mask’ out certain alarms as explained below. Alarms that

are recorded in the event buffer are the same as the alarm buffer.

Masking alarms may cause undesirable modem performance .

CAUTION

When an alarm is masked the Fault Relay do not get asserted, but the Alarm will still be

displayed. This feature is very helpful during debugging or to lock out a failure of which the user

is already aware.

5.2.2.1 Active Alarms

5.2.2.1.1 Major Alarms

Major Alarms indicate a modem hardware failure. Major Alarms may flash briefly during

modem configuration changes and during power-up but should not stay illuminated. Alarms are

grouped into Transmit and Receive Alarms - Transmit and Receive are completely independent.

5.2.2.1.2 Minor Alarms

Minor Alarms indicate that a problem may persist outside the modem such as loss of Terrestrial

Clock, loss of terrestrial data activity, or a detected transmit or receive AIS condition.

Alarms are grouped into Transmit and Receive Alarms - Transmit and Receive are completely

independent.

5.2.2.1.3 Common Equipment Faults

Common equipment faults indicate hardware or configuration problems in the modem that effect

both transmit and receive operation. Most common faults indicate a hardware failure within the

modem, such as a bad power supply. Common faults for the External Reference and External

Clock indicate a bad modem configuration, not a hardware failure.

5.2.2.2 Latched Alarms

Latched Alarms are used to catch intermittent failures. If a fault occurs, the fault indication will

be latched even if the alarm goes away. After the modem is configured and running, it is

recommended that the Latched Alarms be cleared as a final step.

MN-DMD1050 5–4

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Radyne OM20 Specifications Page 72