Nortel Networks 450 manual Port Connection Problems, Corrective Actions

Troubleshooting

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). Do not place the switch in areas where it can be exposed to 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 Status LED is off.

The switch is experiencing a port connection problem.

The switch’s link partner is not autonegotiating properly.

A fatal error was detected by the self-test.

See “Port Connection Problems” on page 4-7.

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	A nonfatal error occurred	Cycle the power to the switch (disconnect and
blinking.	during the self-test.	then reconnect the AC power cord).
		If the problem persists, contact the Nortel
		Networks Technical Solutions Center.

Port Connection Problems

You can usually trace port connection problems to either a poor cable connection or an improper connection of the port cables at either end of the link. To remedy these types of problems, make sure that the cable connections are secure and that the cables connect to the correct ports at both ends of the link.

Port connection problems are also traceable to the autonegotiation mode or the port interface.

302401-D Rev 00 4-7