Nortel Meridian 1 Manual page 93

Possible cause
Defective CE card
(lit LED)
Defective
backplane
Clearing common equipment faults
Action
Unseat the CP and CNI cards, then reinstall them. Make sure all cables
are securely connected. If all cards do not recover, continue with this
procedure.
If the display on the CP card shows a fault:
LD 135
TEST CPU
If there is a problem with the test, CCED system messages will be
generated.
If the LED is lit on some other CE card, check the CNI card, enter:
LD 135
TEST CNI c s
where c represents the CPU 0 or 1 and s represents the card slot.
If the CPU is still faulty, replace the CE cables one at a time.
If CNI is faulty, disable the card before you out it.
If the CPU remains faulty, go to the next possible cause.
Replace the card cage assembly in the module.
To be able to replace the card cage, you must first switch the system to
use the alternate CPU and then disable and remove all the cards in the
card cage you wish to replace.
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Meridian 1 Fault clearing