Cisco Catalyst 4900M Installation Manual page 76
Catalyst 4900m switch
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Also See for Catalyst 4900M:
- Installation manual (128 pages) ,
- Troubleshooting manual (6 pages) ,
- Configuration handbook (359 pages)
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Identifying Startup Problems
Table 4-1
LED and Color
INPUT OK (AC)
Green
Red
Off
INPUT OK (DC)
Green
Red
Off
OUTPUT OK
Green
Red
Verify that the LEDs on the front panel are lit:
Step 2
•
Cisco Catalyst 4900M Switch Installation Guide
4-4
Power Supply LED Meanings
Meaning
This LED should turn green immediately when power is
applied to the supply and the power switch is set to ON.
AC input voltage is greater than 80.5 +/- 4.5 V AC.
In a dual power supply configuration (alternate unit
powered) the AC input is less than 73 +/-3V, or the power
supply is turned off.
In a single supply configuration, signals that AC input
voltage is less than 73 +/-3V, or the power supply is turned
off.
This LED should turn green immediately when power is
applied to the supply.
DC input voltage is greater than -38.25 +/-2.25V.
In a dual power supply configuration (alternate unit
powered) the DC input is less than 33 +/-3V, or the power
supply is turned off.
In a single supply configuration, the LED shall be off to
signal that DC input is less than 33 +/-3V, or the power
supply is turned off.
DC output voltages are within the normal operating range.
Output voltages below the minimum or above the
maximum will create an output fail alarm and cause the
LED to illuminate red.
The STATUS LED flashes yellow during diagnostic boot tests. It is green
when the switch is operational (online). If the system software is unable to
start up, this LED stays orange.
Chapter 4
Troubleshooting the Installation
78-18350-01
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Table of Contents
Troubleshooting
