
Troubleshooting
Normal Power-Up Sequence
In a normal power-up sequence, the LEDs appear as follows:
1.After power is applied to the switch, the Pwr (Power) LED turns on within five seconds.
2.The switch initiates a
3.Upon successful completion of the
4.The remaining port LEDs indicate their operational status, as described in Table
Table 4-2. Corrective Actions
Symptom | Probable cause | Corrective action |
All LEDs are off. | The switch is not receiving AC |
| power. |
Verify that the AC power cord is fastened securely at both ends and that power is available at the AC power outlet.
The fans are not operating or the airflow is blocked, causing the unit to overheat.
Verify that there is sufficient space for adequate airflow on both sides of the switch.
Note: Operating temperature for the switch must not exceed 40°C (104°F). The switch should not be placed in the direct sunlight or near warm air exhausts or heaters.
The Activity LED for a connected port is off or does not blink (and you have reason to believe that traffic is present).
The switch is experiencing a See “Port Connection Problems” on page
The switch’s link partner is not autonegotiating properly.
(continued)
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