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Chapter 4

Troubleshooting

This chapter describes how to isolate and diagnose problems with your BayStack

420 Switch and covers the following topics:

“Interpreting the LEDs,” next

“Diagnosing and correcting problems” on page 175

Normal power-up sequence

Port connection problems

The chapter topics lead you through a logical process for troubleshooting the BayStack 420 Switch. For example, because LEDs provide visual indications of certain problems, see “Interpreting the LEDs” on page 173 to understand the various states (Table 42) that your switch LEDs can exhibit during normal operation.

For more help in determining the problem, “Diagnosing and correcting problems” on page 175 describes symptoms and corrective actions (Table 43) you can perform to resolve specific problems. Subsequent sections give step-by-step procedures to correct the problems.

Interpreting the LEDs

Figure 78 shows the BayStack 420 Switch LED display panel. Table 42 describes the LEDs.

Using the BayStack 420 10/100/1000 Switch

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Nortel Networks 1000ASE-XD, 1000BASE-SX, 1000BASE-LX, 1000BASE-ZX manual Chapter Troubleshooting, Interpreting the LEDs