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Appendix C Troubleshooting
1. Power LED does not turns on?
Ans:
The Switch supports two power sources, 12VDC and 802.3af, please check which kind of
power system deployed.
a) Powered from POE: please check with network administrator if the POE injector device
is complied with 802.3af standard and well connected to port#1 of the Switch with 4-pair
UTP cable within 100 meters. FSD-504PE will detect the signal from 802.3af POE device
and response to get the 48VDC power. Connect with non-802.3af complied injector to
port#1 could damage the Switch permanently
b) Powered from 12VDC: the Switch supports 12VDC AC adapter. Please check the AC
adapter complies with 12V DC output. Incorrect DC power to the Switch, higher voltage
could damage the Switch, and lower voltage will not power on the Switch.
2. POE LED always blinking and can not boot up the Switch?
Ans:
The Switch only requires one power source, i.e. from POE or from 12V DC. By default, POE
will be the first priority. However, if the POE device cannot provide sufficient power from the
injector, or 12V DC power is just removed from the DC-jack, the “POE” LED will blink.
a) Powered from POE: please consult the network administrator if the POE device can
provide the sufficient current or not.
b) Powered from 12VDC then POE: please remove all the power connection, i.e. both DC
plug and port#1. And re-connect the port#1 to force the Switch detect its power system
again.
3. Performance is not good?
Ans:
Please check the duplex setting of the Switch and the connected device, if the connected
device does not support Auto-Negotiation, please set the device to forced half-duplex mode.
Otherwise, the performance could be poor due to the incorrect duplex mode setting.
Please also check the PCs in the network, for some times, if one of the PCs sending
abnormal broadcast to the network it will also affect the overall network performance. You
can check the LED of the switch to diagnose the symptom. Remove all the connection and
plug-in one by one, if the LNK/ACT LED is blinking all the time (never stop), please isolate
this PC and see if the performance will goes back to normal if the reset PCs are connected
back to the switch.