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6. Troubleshooting
If you find any problems, 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
degrees 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 degrees 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 Switch-
ing Hub or the terminal settings.
■ The Port LED (Left) lights in failed.
Check the port settings of this Switching Hub or the terminal settings.
■ LOOP HISTORY LED Blinks in green.
● This is no 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 auto negotiation 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 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 con-
nection 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.
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