User’s Guide
Page 34 of 34
Appendix Trouble shooting
Problems
Reasons
Solutions
All LEDs are off when
power on the switch
Power cord connection error or
power supply failure
Check power cord connection and the
power socket.
The LINK LED is unlit.
1
．
Network cable is damaged or
the connection is not firm.
2
．
Wrong network cable type or
the cable is longer than 100m.
Change the network cable.
Slower data transmitting
and packets loss.
The communication pattern of
switch and PDs are not matched.
Changed to matched pattern or configure
to auto-negotiation pattern.
The network cable
works in one
port ,doesn
’t work in
another new port.
There is no data transmitting from
PD and the switch can
’t learn a
new address to do
communication.
Waiting for 120s, the swith will get
auto-updated address or transmitting
data from the PD, the switch will get
address then.
All the
“ACT” LEDs flash
and the network rate
slow down
Caused by broadcast storm.
1. Check if there is a loop problem,
reasonably configure the network.
2. Check if there are large numbers of
broadcast packets from specific sites.
Stop to work after
working for a while.
1. Abnormal power supply.
2. Overheating.
1. Check power connection and the
working voltage;
2. Check the working
environment,including air hole and
switch fan.
“PoE” LED indicators
flash
1. PoE port doesn
’t work
2. PD is overloaded
3. The network cable is damaged.
Check the network cable, port
connection or reduce the load of PDs.
