Alcatel-Lucent 9500 MXC User Manual page 734

Probable Cause
Recommended Actions
Temperature
Probable Cause
Recommended Actions
Expansion NCC Communications Failure
Vol. VI-B-8
Equipment malfunction.
1. Check for other alarms to determine how critical alarm is. Depending on the
malfunction, the node may otherwise operate satisfactorily.
2. Replace the NCC.
NCC/IDU temperature is out of tolerance. This is a warning alarm.
1. The FAN is faulty (Node only).
2. The indoor ambient temperature is excessive.
3. The temperature sensing circuit is faulty.
1. Check Node FAN LED.
If alarmed, the problem is likely to be caused by inadequate cooling due to an
inoperative or defective FAN.
If not alarmed, the problem is likely to be caused by high ambient
temperature, restricted airflow, or a defective temperature sensing circuit.
2. Check the ambient temperature at the INU/INUe/IDU, which must be no
higher than +45 degrees Celsius (113 F). Bear in mind the ambient
temperature in an enclosed rack may be much higher than the ambient within
the equipment room.
3. Check that airflow is not restricted. The INU/INUe requires unimpeded
airflow to each side for the fan cooling to be fully effective, which means that
there should be not less than 50mm (2") clearance on both sides.
4. If there are no other alarms, the ambient temperature is OK and the airflow is
not restricted, then suspect the temperature sensing circuit. Replace the NCC/
IDU.
Can't cooperate with expansion NCC. This is a major alarm.
Alcatel-Lucent