Руководство Пользователя для 3com 2226 PLUS

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.

 summarizes the possible colors for the Power 

LED after POST.

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 is 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

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 

. 

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.

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).