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C
HAPTER
 2: I
NSTALLING
 
THE
 S
WITCH
The Power-up 
Sequence
The following sections describe how to get your Switch 4400 
powered-up and ready for operation.
Powering-up the
Switch 4400
Use the following sequence of steps to power-up the Switch.
Plug the power cord into the power socket at the rear of the Switch.
Plug the other end of the power cord into your power outlet.
The Switch powers-up and runs through its Power On Self Test (POST), 
which takes approximately 10 seconds.
Checking for Correct
Operation of LEDs
During the Power On Self Test, all ports on the Switch are disabled and 
the LEDs light in a set sequence.
When the POST has completed, check the Power/Self Test LED to make 
sure that your Switch is operating correctly. Table 6 shows possible colors 
for the LED.
Table 6    Power/Self Test LED colors
If there is evidence of a problem, see “Solving Problems Indicated by 
LEDs” on page 58.
Connecting a
Redundant Power
System
You can connect a SuperStack 3 Advanced Redundant Power System 
(3C16071B) to the Switch. This unit, which is also known as an RPS, is 
designed to maintain the power to your Switch if a power supply failure 
occurs.
For normal redundancy, the Switch 4400, Switch 4400 SE, and 
Switch 4400 FX require one Type 2A Power Module (3C16074A). For full 
redundancy, the Switch 4400, Switch 4400 SE, and Switch 4400 FX 
require two type 2A Power Modules combined using a Type 2 Y-Cable. 
The Switch 4400 PWR (3C17205) requires one Type 3 Power Module 
(3C16075) for normal redundancy and two Type 3 Power Modules for full 
redundancy.
Color
State
Green
The Switch is powered-up and operating normally.
Yellow
The Switch has failed its Power On Self Test.
Off
The Switch is not receiving power.
DUA1720-3AAA07.book  Page 30  Wednesday, March 17, 2004  1:14 PM