Nortel Circuit Card, Installation Manual, Page: 421 / 908

NT6D80 MSDL card Page 421 of 906
Circuit Card Description and Installation
Replacing MSDL cards
After completing MSDL troubleshooting you may determine that one or more
MSDL cards are defective. Remove the defective cards and replace them with
new ones.
Procedure 19
Replacing an MSDL card
An MSDL card can be removed from and inserted into a system module
without turning off the power to the module. Follow these steps:
1 Log in on the maintenance terminal.
2 At the > prompt, type LD 37 (you can also use LD 42, LD 48, or LD 96)
and press Enter.
3 Type DIS MSDL x ALL and press Enter to disable the MSDL and any
active operations running on one or more of its ports. The MSDL card is
now disabled.
4 Disconnect the cables from the MSDL faceplate connectors.
5 Unlatch the card-locking devices, and remove the card from the module.
6 Set the switches on the replacement card to match those on the defective
card.
7 Insert the replacement card into the same card slot.
8 Observe the red LED on the front panel during self-test. If it flashes three
times and stays on, it has passed the test. Go to step 8.
9 If it does not flash three times and then stay on, it has failed the test. Pull
the MSDL partially out of the module and reinsert it firmly into the module.
If the problem persists, troubleshoot or replace the MSDL.
10 Connect the cables to the MSDL faceplate connectors.
11 At the . prompt in the LD 37 program, type ENL MSDL x ALL and press
Enter to enable the MSDL and its operations. If the red LED on the MSDL
turns off, the MSDL is functioning correctly. Since self-tests were not
invoked, no result message appears.
12 Tag the defective card(s) with a description of the problem and return
them to your Nortel representative.
End of Procedure