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Problem
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Probable Cause
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Corrective Action
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Power LED is not lighted. | There is no power to the switch. | Confirm that the switch is connected to a properly functioning and active power source. |
Ensure that the power cable is securely connected to the switch and to a power source. |
Link LED is not lighted. | The cable is not securely connected to the switch or the attached device. | Ensure that the connectors are fully inserted into the ports of the switch and the attached device. |
The attached device is not configured correctly, or it is not powered on. | Ensure that the attached device is powered on. Verify that the NIC on the attached device is operating properly. |
The cable is damaged or not properly terminated. | Test the cable.
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Try a known working cable. |
Ensure that the cables are terminated using TIA 568A or 568B standards.
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The cable's maximum distance has been exceeded. | 10Base-T, 100Base-T, and 1000Base-T cables have limitations for link lengths. Move the connected device closer to the switch and use a shorter cable. |
Mismatched duplex mode. | Ensure that all devices connected to the switch are configured to automatically detect and set port speed and duplex settings. |
Bad switch port. | Reconnect the connector for the affected link to a different switch port. |
Link speed LED indicates a lower speed than expected. | Incorrect cable grade. | Ensure that you are using Category 5 cable or better for all 10Base-T and 100Base-T links, or Category 5e for 1000Base-T links. |
Damaged cable. | Test any cables that have kinks, sharp bends, or appear to be damaged. |
The cable's maximum distance has been exceeded. | 10Base-T, 100Base-T, and 1000Base-T cables have limitations for link lengths. Move the connected device closer to the switch and use a shorter cable. |
Link LED is lighted, but the activity (ACT) LED does not blink. | There is no Ethernet traffic on the link. The LED blinks only when traffic is being passed to or sent from a device that is connected to the port. | No action required. |
The attached device is not configured correctly. | Verify that the port or NIC on the attached device is operating properly. |
Link LED is lighted and the FDX/HDX LED blinks occasionally. | This can be normal link activity. Some collisions take place during normal operation. | No action required. |
Link LED is lighted and the FDX/HDX LED blinks frequently. | Mismatched duplex mode. | Ensure that any devices connected to the switch are set to automatically detect and set port speed and duplex settings. |
The link is reaching its maximum capacity. | Resegment the network to decrease the number of users on the link. |