6 Aviat Networks
3. If the alarm remains, replace the IDU.
Additional Information
RAM function is checked during power-up and software reloads.
RTC Failure
Loss of communication with the RTC (realtime clock). This is a warning alarm.
Probable Cause
Equipment malfunction.
Recommended Actions
1. Check for other alarms to determine how critical the alarm is. Depending on the
malfunction, the terminal may otherwise operate satisfactorily.
2. If there are no other alarms to indicate a general IDU failure, check configuration
of the clock in the Portal Date/Time screen. Also check if events in the Portal Events
Browser screen are still being date/time stamped. If normal, an RTC specific
communications problem is indicated.
3. Depending on the location of the problem, it may clear when the terminal is
rebooted.
If the problem remains, replace the IDU.
Additional Information
The RTC holds the date/time reference.
Temperature
IDU temperature is out of tolerance. This is a warning alarm.
Probable Cause
The indoor ambient temperature is excessive.
The temperature sensing circuit is faulty.
Recommended Actions
1. Check the ambient temperature at the IDU, which must be no higher than +55
degrees Celsius (131 F). Bear in mind the ambient temperature in an enclosed rack
may be much higher than the ambient within the equipment room.
2. If there are no other alarms, the ambient temperature is OK and airflow is not
restricted, then suspect the temperature sensing circuit. Replace the IDU.
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