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6-2
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 6 Maintaining the Cisco MGX Switch or Gateway
Swapping a Primary or Redundant DC Power Entry Module with Power On
Swapping a Primary or Redundant DC Power Entry Module with
Power On
If necessary, you can replace either a primary or a redundant DC power entry module (PEM) with power
on. To avoid possibly tripping the system circuit breaker in the process, complete the following steps.
Caution Do not use a power screwdriver on captive screws.
Warning
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
disconnect the power at the circuit breaker on DC units.
Statement 12
Step 1 Connect a grounding strap to the ESD grounding jack or to the equipment rack.
Step 2 Turn off the circuit breaker only on the DC PEM that you intend to replace.
Step 3 Turn off the branch circuit at the DC source (the distribution box, for example) for the correct branch.
Step 4 Disconnect DC source wiring:
• If your terminal block has a plastic cover, complete Step 5 and Step 6 to disconnect the DC source
wiring. Then proceed to Step 10.
• If your terminal block does not have a plastic cover, proceed to Step 7.
Step 5 Use a Phillips-head screwdriver to remove the plastic terminal block cover on the DC PEM that you
intend to replace (see Figure 6-1).