Nortel Circuit Card Installation Manual page 419

Manually isolating and correcting faults
Problems are due to configuration errors that occur during installation or
hardware faults resulting from component failure during operation. See
"Symptoms and actions" on
symptoms and required responses.
Isolate MSDL faults using the diagnostic tools described below:
1 Observe and list the problem symptoms; for example, a typical symptom
is a permanently lit LED.
2 If the LED flashes three times but the card does not enable, verify that
the card is installed in a proper slot.
3 Check that the address is unique; no other card in the system can be
physically set to the same device number as the MSDL.
4 If installation is correct and no address conflict exists, refer to "Newly
installed MSDL cards" on
cards" on
5 If the MSDL still does not operate correctly, contact your Nortel
representative.
Newly installed MSDL cards
Problems that occur during MSDL card installation usually result from
improperly installed, incorrectly addressed, or faulty cards.
If the LED on a newly installed MSDL does not flash three times after
insertion, wait 5 minutes, then remove and reinsert. If the LED still does not
flash three times, the card is faulty.
page 422
page 419
page 420.
NT6D80 MSDL card
for more information on problem
or "Previously operating MSDL
Circuit Card Description and Installation
Page 419 of 906