Nortel Meridian 1 Manual page 143

Possible cause
Defective NT5K10
DLB card
Defective PE card
Defective cable
Defective
backplane
Clearing peripheral equipment faults
Action
In Dual Loop Mode
— Unseat 4 PE cards pertaining to the defective loop or
In Single Loop Mode
— Unseat 8 PE cards pertaining to the defective loop.
Wait for the OVD message.
If there is no OVD message, go to the defective PE card.
If you receive an OVD message, remove the backplane access plate at
the rear of the EEPE shelf and replace the Dual Loop Peripheral Buffer
Card.
Reinsert the PE cards on the shelf.
Replace the backplane access plate.
For the EEPE shelf only: remove the backplane access plate at the rear of
the module.
Unseat all the cards in the shelf associated with the DLB card:
— If the red LED on the DLB card turns off, the fault is in one of the
unseated cards.
— Reinsert the cards one at a time.
— When the DLB LED turns on again, replace the last card you
inserted.
If the red LED on the DLB does not turn off when the PE cards are
unseated, reinstall the cards and go to the next possible cause.
For the EEPE shelf only: replace the backplane access plate at the rear of
the module.
Test all cables to the DLB 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