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15. Troubleshooting
If you find any problems, please take the following steps to check.
◆ LED indicators
■ The power LED (POWER) is not lit.
● Is the power cord connected?
→ Check that the power plug is firmly connected, so the connection is not
loose at the power port.
■ The port LED (Left) is not lit in the Status mode.
● Is the switch set to the Status mode?
When the switch is set to the ECO mode, all LEDs are turned off regardless
of connection statuses of the terminals.
● Is the cable correctly connected to the target port?
● Is the device connected to the port compliant with the relevant standard?
● Auto-negotiation may have failed.
→ Set the port of this switch or the terminal to half-duplex mode.
■ The port LED (Right) is lit solid orange.
● A loop is occurring. When you recover from the loop, the solid orange LED
is turned off.
■ LOOP HISTORY LED is flashing green.
● There is a port currently having a loop, or a port that recovered from a loop
less than 3 days ago.
◆ Communications are slow.
● Are the communication speed and mode settings correct?
When an appropriate communication mode signal cannot be properly
obtained, the switch operates in half-duplex mode.
Recheck the auto negotiation settings.
Do not fix the communication mode of the connected device to full-duplex
mode.
● Is the bandwidth usage rate of the network to which this switch is connected
excessively high?
Try separating this switch from the network.
◆ Communications fail.
● Are the ports linking up?
If the MNO series power saving mode is set to "Full", set it to "Half" or "Dis-
abled."
● Is the port LED (Right) lit solid orange?
If the port LED (Right) is lit solid orange, the port is being blocked by the Loop
detection and blocking function. After the port is recovered from the loop,
wait for more than the recovery time until a port starts to be automatically
recovered, or release the blocked port on the configuration screen.
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