Troubleshooting
304376-B Rev 00
4-5
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 self-test, during which the port LEDs display
various patterns to indicate the progress of the self-test.
3.
Upon successful completion of the self-test (within 10 seconds after power
is applied), the Status LED turns on.
4.
The remaining port LEDs indicate their operational status, as described
in Ta ble 4 -2
.
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
port connection problem.
See “
Port Connection Problems” on page 4-6.
The switch’s link partner is not
autonegotiating properly.
(continued)
kombk.book Page 5 Thursday, February 18, 1999 10:59 AM
