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3com 3CR17451-91 User Manual

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The Power-up Sequence
23
The Power-up 
Sequence
The following sections describe how to get your Switch 3870 
powered-up and ready for operation.
Powering-up the
Switch 3870
Use the following sequence of steps to power-up the Switch.
1 Plug the power cord into the power socket at the rear of the Switch.
2 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 1 minute.
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 rapid sequence.
When the POST has completed, check the Unit Status to make sure that 
your Switch is operating correctly. Table 7 shows possible colors for the 
LED. 
Table 7   Unit Status Colors
If there is evidence of a problem, see “Solving Problems Indicated by 
LEDs” on page 46 for a list of suggested solutions.
CAUTION: The Switch has no ON/OFF switch; the only method of 
connecting or disconnecting mains power is by connecting or 
disconnecting the power cord.
Connecting a
Redundant Power
Supply
You can connect a SuperStack 3 Advance Redundant Power System to 
the Switch. This unit, which is also known as RPS, is designed to maintain 
the power to your Switch if a power supply failure occurs.
For normal redundancy, the unit requires a Type 3 Power Module (part 
number 3C16075)
Color
State
Green
The Switch is powered-up and operating normally.
Yellow
The Switch has failed its Power On Self Test (POST).
Off
The Switch is not receiving power. 
DUA1745-0AAA03.book  Page 23  Friday, April 8, 2005  12:34 PM