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Troubleshooting
309979-A Rev 00
4-5
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.
The Status LED is off. A fatal error was detected by
the self-test.
Cycle the power to the switch (disconnect and
then reconnect the AC power cord).
If the problem persists, replace the switch.
The Status LED is
blinking.
A nonfatal error occurred
during the self-test.
Cycle the power to the switch (disconnect and
then reconnect the AC power cord).
If the problem persists, contact the Nortel
Networks Technical Solutions Center.
When connecting a
console/terminal to an
operating switch through
the switch’s serial
Comm Port, the
console/terminal
displays a blank screen.
This is a normal condition. Press [Cntrl]-C to refresh the screen.