3Com Network Router Unified Gigabit Wireless PoE Switch 24 User Manual

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16 Installing the 3Com Unified Switch 24
Checking for
Correct Operation
After you power-on the switch, it automatically performs a power-on
self-test (POST). During the POST, the System LED on the front panel of
the switch flashes green.
When the POST is complete, the System LED turns green. If the System
LED turns amber after the POST, it means that POST failed. Table
Table 2
summarizes the possible colors for the System LED after a POST.
If POST fails, try the following:
■ Power off the Switch 24 and then power it on again by unplugging
and then plugging in the power cord.
■ Check the System LED and determine if the POST was successfully
completed.
■ Reset the switch to the factory defaults. See “Reset Button” on
page 8.
CAUTION: Resetting the switch to its factory defaults erases all your
settings. You will need to reconfigure the switch after you reset it.
If these do not resolve the issue:
■ Check the 3Com Knowledgebase for a solution. To visit the 3Com
Knowledgebase Web site, start your Web browser, and then enter
http://knowledgebase.3Com.com
■ Contact your 3Com network supplier for assistance.
Table 2 Possible System LED Colors After a POST
Color State
Green The unit is powered on and ready for use.
Amber Power-on self-test or loopback test failed. This indicates that
there is a hardware malfunction.
Off The unit is not receiving power:
■ Verify that the power cord is connected correctly, and
then try powering on switch again.
■ If the switch still does not operate, contact your 3Com
network supplier

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