Cisco Systems 4948E-F manual LED Readings, LED and Color Meaning, Input OK AC, Input OK DC

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.

Table 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, or the
	power supply is turned off.
	• Off—AC input voltage is less than 73 ±3 V, or the
	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 V.
	• Red—In a dual power supply configuration (alternate
	unit powered) the DC input is less than 33 ±3 V, or the
	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.

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

OL-21561-02 C-3