H3C Technologies H3C S3100V2 Series Switches - Manual (Page 53)

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Step2 Check the power supply system. Make sure that the power supply system works properly and outputs a
voltage required by the switch.
Step3 If the failure still exists, contact the local agents or technical support engineers.
Troubleshooting interfaces
Each interface has a corresponding LED. When an interface connected to the network works properly,
the corresponding LINK LED is on. If the LED of an interface connected to the network is off, the interface
or the connecting cable may fail. Follow these steps to troubleshoot the interface:
Step1 Check whether the switch works properly.
Step2 Check the cable connection of the interface. For how to correctly connect the cable to an Ethernet
interface with a RJ-45 connector or an optical interface, see the chapter “
Connecting the switch to the
network .”
Step3 Check whether the cable fails. Use the cable to connect two interfaces of the same type that work
properly. If the LEDs of the two interfaces are on, the cable is normal. Otherwise, the cable fails.
Step4 If the interface uses a transceiver module, check that the interface type is compatible with the transceiver
module and the transceiver module is compatible with the cable.
Step5 If the interface uses a transceiver module, make sure that the current transceiver module works properly
by replacing a normal transceiver module.
Step6 If the interface is a combo interface (which contains an optical interface and an electrical interface),
make sure that the interface used for connecting is activated for the combo interface. Then, use the
combo enable { copper | fiber } command in interface view to activate the port, and check the LED.
NOTE:
•
A combo interface is a logical interface that comprises one optical (fiber) port and one electrical
(copper) port. The optical and electrical ports of a combo interface share one interface view. When you
enable either port by using the combo enable { copper | fiber } command in interface view, the other
port is automatically disabled.
• After an interface fails, if the switch has an idle interface of the same type, you can plug the cable into
the idle interface.
Step7 Check that the speed and duplex settings of the interfaces of a link are the same. Make sure that two
interfaces can work together.
Step8 If the failure still exists, contact the local agents or technical support engineers.
Troubleshooting the PoE system
If an S3100V2-TP-PWR-EI switch cannot supply power for a powered device (PD) attached to the switch,
follow these steps to troubleshoot the PoE system:
Step1 Check that the power cable that connects the switch to the PD is a straight-through cable.
Step2 Make sure that the PoE-related configurations are correct. For how to configure PoE, see the related
configuration guide.