Bay Technical Associates 350 Diagnosing and Correcting the Problem, Normal Power-up Sequence

Using the BayStack 350 10/100 Autosense Switch

Diagnosing and Correcting the Problem

Before you perform the problem-solving steps in this section, cycle the power to the BayStack 350 switch (disconnect and then reconnect the AC power cord); then, verify that the switch follows the normal power-up sequence.

Normal Power-up Sequence

When power is applied to the BayStack 350 switch, the LEDs display in the following sequence:

1.After power is applied to the switch, the 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 Diagnostics LED turns on.

4.The remaining port LEDs indicate their operational status as described in Table 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 outlet.

The Activity LED for a connected port is off or does not blink (and you have reason to believe that traffic is present).

The fans are not operating or the airflow is blocked, causing the unit to overheat.

The switch is experiencing a port connection problem.

The switch link partner is not autonegotiating properly.

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.

See “Port Connection Problems” onpage 4-5.

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