Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 617

56K Crossover PCA replacement (NT6M48AA)
To replace the 56K Crossover PCA, use the following procedure. Refer to
Table 6-21 and Figure 6-21 for a description of the switch and jumper options
for this PCA.
Procedure 6-42
56K Crossover PCA replacement (NT6M48AA)
Step Description
CAUTION
Since all BMC PCAs are static sensitive, be careful when handling them.
Wear a wrist grounding strap when working with the BMC.
WARNING
Since the BMC is powered up during this procedure, observe all safety
procedures for operations on live equipment.
69
Make sure no polling is occurring. Wait for a low traffic period, if possible.
70
Remove the slotted captive screws that fasten the outer edges of the B rear panel assembly
to the cabinet.
71
Remove the front panel of the A chassis. Put the two panels in a safe place to prevent
bending and scratching.
72
Remove the power from the 56K Crossover PCA first by disconnecting plug P1. Then
remove the other cables.
Note: Verify the cable markings (identification) or attach labels to the cables when removing them
to facilitate replacement in the correct positions.
73
Remove the screws that fasten the 56K Crossover PCA. Gently remove the PCA from its
mounting position.
74
Mount the replacement assembly in the vacated position.
BMC II BISYNC Operation, Administration, and Maintenance Guide BMCB001 and up
Section 060-INDP-610 Maintenance Procedures Guide 6-179
(Sheet 1 of 4)