Cisco Cisco 4402 Wireless LAN Controller Guia Da Instalação

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One power supply unit is installed in slot 2 at the factory. You can order a second power supply unit 
and install it in slot 1.
Tools and Equipment Required
To install a power supply unit, you need the following tools and equipment:
A power supply unit
A number 1 Phillips screwdriver
Follow these steps to install a power supply unit.
Step 1
Locate the empty power supply slot on the controller’s back panel. See Figure 3.
Figure 3
Controller Power Supply Slots
Note
The power supply units are hot swappable.
Step 2
Use a Phillips screwdriver to loosen the captive screws on the slot cover.
Step 3
Remove the slot cover and store it in a safe place for future use.
Step 4
Align the power supply unit with the slot so that the unit’s power input receptacle is on the 
left side of the slot. See Figure 4.
142297
Slot 1
Slot 2