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Maintaining the Chassis 4-9
Removing and Installing DC-Input Power Supplies
Powering Up the AC-Input Power Supply
Perform these steps to power up the AC-input power supply and confirm the installation:
Step 1 Turn the power switch of the AC-input power supply on ( | ).
Step 2 Verify that the LEDs (See Figure 4-1.) on the front panel of the power supply are
in the following state within 5 seconds of operation:
• Input OK: ON
• Fan OK: ON
• Output Fail: OFF
Removing and Installing DC-Input Power Supplies
The redundant DC power supplies support hot swapping. When two power supplies are
installed, you can install, remove, or replace one supply without affecting system operation.
When power is removed from one supply, the redundant power feature causes the second
supply to ramp up to full power and maintain uninterrupted system operation. In systems
with dual power supplies, connect each power supply to separate DC-input lines; in the
event of a line failure, the second source is still available.
The DC-input power supply is required by many telcos because these installations are
powered by -48 or -60 VDC batteries. From an operational perspective, the DC-input
power supply has the same characteristics as the AC-input version.
Figure 4-6 shows the location of the DC-input power supplies in a redundant configuration.
In a nonredundant configuration, the power supply goes in the slot labeled Power Supply 0.