Chapter 4 Troubleshooting the Installation
Identifying Startup Problems
Table | Power Supply LED Meanings | |
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LED and Color |
| Meaning |
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| |
INPUT OK (AC) | This LED should turn green immediately when power is | |
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| applied to the supply and the power switch is set to ON. |
Green |
| AC input voltage is greater than 80.5 +/- 4.5 V AC. |
Red |
| In a dual power supply configuration (alternate unit |
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| powered) the AC input is less than 73 |
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| supply is turned off. |
Off |
| In a single supply configuration, signals that AC input |
| voltage is less than 73 | |
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| |
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| off. |
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| |
INPUT OK (DC) | This LED should turn green immediately when power is | |
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| applied to the supply. |
Green |
| DC input voltage is greater than |
Red |
| In a dual power supply configuration (alternate unit |
|
| powered) the DC input is less than 33 |
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| supply is turned off. |
Off |
| In a single supply configuration, the LED shall be off to |
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| signal that DC input is less than 33 |
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| supply is turned off. |
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OUTPUT OK |
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Green |
| DC output voltages are within the normal operating range. |
Red |
| Output voltages below the minimum or above the |
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| maximum will create an output fail alarm and cause the |
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| LED to illuminate red. |
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Step 2 Verify that the LEDs on the front panel are lit:
•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.
| Cisco Catalyst 4900M Switch Installation Guide |
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