Field Replaceable Units
Page 120 7450 ESS-7
DC POWER
REMOVING A DC PEM
If you are operating your 7450 ESS-7 with redundant DC PEMs, you can remove and replace a
single PEM without affecting your system’s operation. If you are operating your 7450 ESS-7 with
only one DC PEM, the system will shut down when power to the PEM is removed.
Figure 38: Removing a DC PEM
Danger:
• If your 7450 ESS-7 switch is powered by AC power rectifiers, you must remove all cable
connections which attach to the DC PEM you are removing.
• Turn off the power from the remote power source to the PEM before you remove the safety
cover.
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