Troubleshooting
18
If you find any problem, please take the following steps to check.
LED
The POWER LED (Power) is not lit.
Check if the power cord is disconnected. Please confirm that the power cord is
securely connected to the power port.
Is the Switching Hub being used at a temperature between 0 and 50
°
C?
Use the Switching Hub in its operating temperature range.
Note: If used at a temperature out of the operating temperature range, the
protection equipment becomes activated and PoE power supply stops.
The default operating temperature range is 0 to 50
°
C.
The Port LED is not lit in Status mode.
Is the cable correctly connected to the target port?
Is the cable appropriate to use?
Is the terminal connected to the relevant port conforming with 10BASE-T,
100BASE-TX, or 1000BASE-T standard?
Auto-negotiation may have failed.
Check the port settings of this Switching Hub or the terminal settings.
The Port LED (Right) lights in orange.
Loop is occurring. By removing the loop, orange LED will be turned off.
LOOP HISTORY LED Blinks in orange.
This is to notify that there is a port in which a loop is occurring, or has been
removed within 3 days.
Communications are slow.
Are the communication speed and mode settings correct?
If the proper communication mode signal cannot be obtained, apply
half-duplex mode.
Please reconfirm autonegotiation setting.
Is not the utilization ratio of the network to which this Switching Hub is
connected too high?
Try separating this Switching Hub from the network.
Communications fail.
Is the link-up correct?
If embedded power saving mode is set to Full, change the setting to Half or
Disabled.
Is the Port LED (right) lit in orange?
If the Port LED (right) lit in orange, the port is shut down by the loop detection
function. Eliminate the loop connection of the device connected to the port
first, and then wait longer than the time required for automatic recovery from
the shutdown by the loop detection function, or release the port shutdown
from the setting screen.
