3Com 3CBLSF26H manual Checking for Correct Operation, Using SFP Transceivers, Status Meaning

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 1-4Summarizes the possible colors for the Power LED after POST

Status	Meaning
Green	The unit is powered on and ready for use.
Yellow	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.
Off	z Verify that the power cord is connected correctly, and then try powering on
	the switch again

zIf the switch still does not operate, contact your 3Com network supplier

If POST fails, try the following:

z

z

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:

z

z

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.

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