Cisco 4948 - Catalyst Switch Installation Guide download pdf (Page 107)

C-3

Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide

OL-21561-02

Appendix C Troubleshooting the Installation

Identifying Startup Problems

LED Readings

LEDs indicate all system states in the startup sequence. By checking the LEDs, you can determine when

and where the system failed in the startup sequence. To check the LEDs, follow these steps:

Step 1 Compare the LED states to those in Table C-1.

Ta b l e C-1 Power Supply LED Meanings

LED and Color Meaning

INPUT OK (AC) This LED should turn green immediately when power is

applied to the supply and the power switch is set to ON.

• Green—AC input voltage is greater than 82 ±3 V.

• Red—In a dual power supply configuration (alternate

unit powered) the AC input is less than 73 ±3

V, o r t h e

power supply is turned off.

• Off—AC input voltage is less than 73 ±3 V, or t h e

power supply is turned off.

INPUT OK (DC) This LED should turn green immediately when power is

applied to the supply.

• Green—DC input voltage is greater than -38.25

±2.25

• Red—In a dual power supply configuration (alternate

unit powered) the DC input is less than 33 ±3

V, o r t he

power supply is turned off.

• Off—In a single supply configuration, the LED shall

be off to signal that DC input is less than 33 ±3

V, or

the power supply is turned off.

OUTPUT OK • Green—DC output voltages are within the normal

operating range.

• Red—Output voltage between the minimum and

maximum limits will not create an output fail alarm.

Output voltages below the minimum or above the

maximum will create an output fail alarm and cause the

LED to illuminate red.

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Cisco 4948 - Catalyst Switch Installation Guide Page 107