Nortel Meridian 1 Manual page 141

Possible cause
Defective PE card
Defective cable
Defective
backplane
Clearing peripheral equipment faults
Action
Unseat all the cards in the shelf associated with the controller card:
— If the red LED on the controller card turns off, the fault is in one of the
unseated cards.
— Reinsert the cards one at a time.
— When the controller card LED turns on again, replace the last card
you inserted.
If the red LED on the controller card does not turn off when the PE cards
are unseated, reinstall the cards and go to the next possible cause.
Test all cables to the controller card.
If you find a defective cable, replace it.
If there is no problem with the cables, go to the next possible cause.
Replace the card cage assembly in the module.
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Meridian 1 Fault clearing