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Lantronix
SM24TBT2DPA and SM24TBT2DPB Web User Guide
Chapter 7 - Troubleshooting
7-1 Troubleshooting Procedure
Most problems are caused by the following situations. Check for these items first when you start
troubleshooting:
1. Verify the install procedures were performed correctly. See the related Install Guide.
2. Check if the SM24TBT2DPx POWER LED is Off:
•
Check connections between the switch, the power cord and the wall outlet.
3. Check if the SM24TBT2DPx Link LED is Off:
•
Verify that the switch and attached device are powered on.
•
Be sure the cable is plugged into the switch and corresponding device.
•
If the switch is installed in a rack, check the connections to the punch-down block and patch
panel.
•
Verify that the proper cable type is used and its length does not exceed specified limits.
•
Check the adapter on the attached device and cable connections for possible defects. Replace
the defective adapter or cable if necessary.
•
Use the
Mode/Reset
button to change LED mode, reset the switch, or restore to defaults.
See the Install Guide for details.
4. Make sure all devices connected to the SM24TBT2DPA are configured to auto negotiate or are
configured to connect at half duplex (all hubs are configured this way, for example).
5. Check the cabling:
•
Look for faulty or loose cables.
•
Look for non-standard and mis-wired cables.
6. Make sure you have a valid network topology:
•
Check for improper Network Topologies.
•
Make sure that your network topology contains no data path loops.
7. Check the port configuration:
•
Make sure ports have not been put into a “blocking” state by Spanning Tree, GVRP, or LACP. The
normal operation of the Spanning Tree, GVRP, and LACP features may put the port in a blocking
state.
•
Verify that the port has not been configured as disabled via software.
8. Review section
7-2 Troubleshooting Q&A
on page
370
below.
9. Record any related error messages, conditions, and configurations for your Tech Support Specialist to
consider.
10. Contact Tech Support.