GS748T Gigabit Smart Switch
Troubleshooting Chart
The following table lists symptoms, causes, and solutions of possible problems.
Symptom | Cause | Solution |
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Power LED is off. | No power is received. | Check the power cord connections and the |
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| connected device. Ensure all cables used are correct |
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| and comply with Ethernet specifications. |
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Link LED is off or | Port connection is not | Check the crimp on the connectors and make sure |
intermittent. | working. | that the plug is properly inserted and locked into the |
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| port at both the switch and the connecting device. |
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| Ensure all cables used are correct and comply with |
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| Ethernet specifications. Check for a defective |
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| computer adapter card, cable, or port by testing them |
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| in an alternate environment where all products are |
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| functioning. |
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File transfer is slow or | Make sure the attached device is set to | |
performance degradation | setting on the switch and | |
is a problem. | the connected device are |
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| not the same. |
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A segment or device is | One or more devices are | Verify that the cabling is correct. Ensure all |
not recognized as part of | not properly connected, | connectors are securely positioned in the required |
the network. | or cabling does not meet | ports. Equipment may have been accidentally |
| Ethernet guidelines. | disconnected. |
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ACT LED is flashing | A network loop | Break the loop by ensuring that there is only one |
continuously on all | (redundant path) has | path from any networked device to any other |
connected ports and the | been created. | networked device. After you connect to the switch |
network is disabled. |
| management interface, you can configure the |
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| Spanning Tree Protocol (STP) to prevent network |
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| loops. |
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