Nortel Passport 15000, Hardware Installation And Maintenance, Page: 214 / 874

214 Chapter 14 Power-and-ground hardware of a Passport 15000 or 20000
241-1501-240 5.2S2
PIM replacement
Replace a power interface module (PIM) to restore back-up power to a shelf
cage.
• “Prerequisites to PIM replacement” (page 214)
• “PIM replacement task flow” (page 214)
Prerequisites to PIM replacement
• Each PIM has terminations for the SCB (HSCX bus) and clock
distribution such that disconnecting a PIM can affect the software
system. Terminations are spread across the PIMs to ensure that removing
one will not affect the redundant pairs. Replace the PIM during a period
of lowest traffic to minimize the impact on clock distribution.
PIM replacement task flow
This task flow shows the sequence of procedures you do to replace a PIM. To
link any procedure, go to “Task flow navigation” (page 213).
Figure 55
PIM replacement task flow
PIM
replacement
Removing a door
(if present)
Installing a PIM
End
Removing a PIM
Installing a door
(as required)
For procedure page
numbers, see
Task flow navigation
below
PP_TASK_1090