UNICOM Electric DynaGST/1602G - Manual (Page 13)

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5. Troubleshooting
The Switch can be easily monitored through panel indicators to assist in
identifying problems. This section describes common problems you may
encounter and where you can find possible solutions.
Diagnosing LED Indicator
If the Link indicator does not light up after connection, check whether the
network interface (e.g., a network adapter card on the attached device),
network cable, or switch port is defective. Verify that the switch and attached
device are powered on. Ensure the cable is plugged into both the switch and
corresponding device. Verify the proper cable type is used and its length
does not exceed specified limits.
Power
If the power indicator does turn on when the power cord is plugged in, you
may have a problem with power outlet or power cord. However, if the Switch
powers off after running for a while check for loose power connections, local
power losses, or surges at power outlet. If you still cannot resolve the
problem, contact your local dealer for assistance.
Transmission Mode
Each port will automatically set to the same transmission mode used by the
attached device (i.e., half or full duplex). The RJ-45 ports use auto-
negotiation to set the transmission mode. If the attached device does not
support auto-negotiation then this switch will default to the lowest common
speed.