18 CHAPTER 2: INSTALLING THE SWITCH
When the Switch is powered on, the Power LED lights
up. If the Power LED does not light up, refer to
“(6)
Power LED” on page 12 for more information.
Checking for Correct Operation
After you power on the Switch, it automatically per-
forms a power-on self-test (POST). During POST, the
Power LED on the front panel of the Switch flashes
green.
When POST is complete, the Power LED turns green.
If the Power LED turns yellow after POST, it means
that POST failed and the Switch has entered fail-safe
mode.
Table 4 summarizes the possible colors for the Power
LED after POST.
Table 4 Possible Power LED Colors After POST
If POST fails, try the following:
■ Power off the Switch, and then power it on again.
Check the Power LED and see if POST was success
-
fully completed.
■ Reset the Switch. See “Resetting to Factory
Defaults” on page 51.
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 assis-
tance.
Connecting a Network Device
To connect a network device to the Switch, use Cate-
gory 5 unshielded or shielded (screened) 100 Ohm TP
cables (or Category 3 cables for 10 Mbps connec
-
tions).
For optimal connections, ensure that the cable length
for each connection is not longer than 100 m (328 ft).
Color State
Green The unit is powered on and ready for use
Yellow Power-on self-test or loopback test failed.
The Switch is in fail-safe mode. This can
happen if a ports or ports fail when the
Switch was powered on.
Off The unit is not receiving power:
■ Verify that the power cord is connected
correctly, and then try powering on the
Switch again
■ If the Switch still does not operate, con-
tact your 3Com network supplier
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