9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. VI-B-9
Probable Cause
Expansion cable unplugged or equipment malfunction.
Recommended Actions
Check the cable.
Replace the affected NCC.
Fan Failure (NCC)
FAN plug-in alarm. This is a warning alarm.
Probable Cause
FAN plug-in malfunction, most likely a failure of one of its two axial fans.
Recommended Actions
Replace the FAN.
Additional Information
The two axial fans operate in protected mode. In the event the operational fan
fails, the standby fan will come on line. While both fans will run if the INU
temperature exceeds a preset threshold, normally just one will run, and operation
will be cycled between the two.
The FAN is field replaceable and can be hot-swapped; removal will not affect
traffic.
Fan Plug-in Missing
FAN missing from fan slot. This is a major alarm.
Probable Cause
The FAN plug-in is misssing or incorrectly seated.
Recommended Actions
Install a FAN, or reseat the FAN in its backplane.
NCC TDM Clock Failure
NCC TDM clock has failed. This is a warning alarm.
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