9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. VI-B-7
Recommended Actions
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.
-48V Supply (NCC/IDU)
-48 volt supply out of tolerance. This is a warning alarm.
Probable Cause
Main 48 Vdc power supply is outside limits of -40.5 to -60 Vdc.
Recommended Actions
3. Measure the 48 Vdc supply with a voltmeter. If the supply voltage is correct,
suspect the voltage sensor circuit in the NCC/IDU. Confirm by checking the
-48V supply voltage in the CT Performance screen.
4. If it is an NCC/IDU problem, check for other alarms to determine how critical
the alarm is. Depending on the malfunction, the Node/Terminal may
otherwise operate satisfactorily.
5. If the fault is with the NCC/IDU (not the supply), replace the NCC/IDU.
Additional Information
The node will operate to specification with a supply voltage between -40.5
and -60 Vdc.
+1.8V Digital Supply (NCC/IDU)
+1.8 volt digital supply out of tolerance. 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 Node/Terminal may otherwise operate satisfactorily.
2. Replace the NCC/IDU.
+1.2V Digital Supply (NCC)
+1.2 volt digital supply out of tolerance. This is a warning alarm.
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