Connecting a Network Device 17
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 43.
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).
Figure 3 Connecting Devices to the Switch
To connect a device to the Switch:
1Connect one end of the cable to an RJ-45 port on the
Switch.
2Connect the other end to the appropriate RJ-45 port
on the connecting device.
For 1000BASE-T operation, 3Com recommends using
Category 5e or 6 cables.
Yellow Power-on self-test or loopback test failed.
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
Color State
Baseline10/100 switch
Endstations on switched
100Mbps connections
Endstations on switched
100Mbps connections
Baseline10/100 switch
BaselineSwitch 2250 Plus
1000Mbps link
10or 100 Mbps link
Serveron switched
1000Mbps
connection
Endstations
onswitched
10or 100 Mbps
connection
1000Mbps copper
orfiber connection
tobackbone or
server/workstation