User manual
17
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.
