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Quick Start Guide: Power Supplies for Cisco 4400 Series WLAN Controllers
78-17159-04
Installation
The Cisco 4400 Series Wireless LAN Controller referred to as the controller hereafter can be powered
using one or two power supply units. When the controller is equipped with two power supply units, the
power supplies are redundant and either power supply unit can continue to power the controller should
the other power supply fail.
One power supply is installed by default in slot 2 at the factory. For redundancy, a second power supply
can be ordered from the factory and may be installed in slot 1. The power supply fits in either slot and
can be used to replace a failed power supply in the field. The power supplies are hot swappable.
Collecting Required Tools and Supplies
To install the power supply unit, you need the following:
• One or two power supply per controller.
• For each removal, one power supply slot cover.
• Number 1 Phillips screwdriver.
Installing the Cisco 4400 Series Power Supply
To install a hot-swappable power supply into the back panel of the controller, perform these steps:
Step 1 Find the slot for the power supply on the back panel of the controller. The slot 1 power supply is in the
slot furthest to the left, and the slot 2 power supply mounts in the first slot from the right on the back of
the Controller.