309978-D Rev 01 4-1Chapter 4TroubleshootingThis chapter describes how to isolate and diagnose problems with yourBayStack 450 switch.This chapter covers the following topics:• “Interpreting the LEDs” (page 4-1)• “Diagnosing and Correcting the Problem” (page 4-5)• “Software Download Error Codes” (page 4-9)The chapter topics lead you through a logical process for troubleshooting theBayStack 450 switch. For example, because LEDs provide visual indications ofcertain problems, refer to “Interpreting the LEDs” on page 4-1 to understand thevarious states (see Table 4-1) that your switch LEDs can exhibit during normaloperation.For more help in determining the problem, “Diagnosing and Correcting theProblem” on page 4-5 describes symptoms and corrective actions (see Table 4-2)you can perform to resolve specific problems. Subsequent sections givestep-by-step procedures to correct the problems.Interpreting the LEDsFigure 4-1 shows the BayStack 450-24T and BayStack 450-12T LED displaypanels. Figure 4-2 shows the BayStack 450-12F LED display panel.Note: The LED Display panel configuration for your switch may be differentthan shown in this section, depending on the date of manufacturing (see thenote in “10BASE-T/100BASE-TX Ports” on page 1-4).
