8
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 its fail-safe mode.
The following summarizes the possible colors for the Power LED after POST.
Table 40 Summarizes 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.
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, contact your HP network supplier
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.”
CAUTION:
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, please contact your HP network supplier for assistance.
Using SFP Transceivers
The following sections describe how to insert an SFP transceiver into an SFP slot.
NOTE:
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.
Inserting an SFP Transceiver
To be recognized as valid, the SFP transceiver must have the following characteristics:
1000BASE-SX or 1000BASE-LX media type:
1000BASE-SX SFP transceiver
Use this transceiver to connect the switch directly to a multimode fiber-optic cable.
1000BASE-LX SFP transceiver
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