Checking For Correct Operation; Using Sfp Transceivers - 3Com 3CBLSF26PWRH User Manual

Checking for Correct Operation

After you power on the switch, it automatically performs 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.
The following summarizes the possible colors for the Power LED after POST.
Table 1-4 Summarizes the possible colors for the Power LED after POST
Status
Green
Yellow
Off
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
successfully completed.
Reset the switch. See Resetting to Factory Defaults.
Resetting the switch to its factory default 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.

Using SFP Transceivers

The following sections describe how to insert an SFP transceiver into an SFP slot.
SFP transceivers are hot-insertable and hot-swappable. You can remove them from and insert them
into any SFP port without having to power down the switch.
The unit is powered on and ready for use.
Power-on self-test or loop back test failed. The switch is in fail-safe mode.
This can happen if a port or ports fail when the switch was powered on.
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, contact your 3Com network supplier
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Meaning