Appendix A Troubleshooting
Problem Solving
Troubleshooting the Power and Cooling Systems
See Table
Table | Troubleshooting the Power and Cooling Systems |
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Symptom |
| Possible Cause | Corrective Action |
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The power (labeled PWR) LED | The power source is not | Check the DC or AC input. | |
on the front panel is not on. | connected properly. | Check the DC or AC source. | |
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| Note When the Cisco ASR |
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| 901 10G router (DC |
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| unit) is powered ON, it |
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| takes about 30 seconds |
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| for the system LED to |
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| turn ON. |
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The router shuts down after | The cause is environmental. | Check for an environmentally | |
being on for only a short time. |
| induced shutdown. (See | |
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| “Environmental Reporting |
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| Features” section on page |
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| The fans do not work; the router | Check the fans. |
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| overheats and shuts down. |
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| The chassis intake and exhaust | Check the chassis intake and |
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| vents are obstructed. | exhaust vents for obstructions. |
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| Clear any obstructions. |
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| Installation does not meet | Check the environmental site |
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| environmental site | requirements in the “System |
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| requirements. | Specifications” on page |
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The router partially boots, but | There is a possible power supply | Check the power LED on the | |
the LEDs do not come on. | failure. | front panel of the router. If the | |
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| LED is on, the power supply is |
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| functional. If the LED is off, refer |
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| to the Cisco Information Packet |
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| for warranty information or |
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| contact customer service. |
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Environmental Reporting Features
The router has a temperature sensor to detect over temperature conditions inside the chassis. The over temperature detection triggers an alert at 70°C. This condition is reported to the processor as an interrupt, where software takes action to generate the appropriate alarms. If the router reaches a temperature of 85°C, the power supply will cycle to prevent the router from exceeding that temperature while being powered up state. See Table
Cisco ASR 901 10G Series Aggregation Services Router Hardware Installation Guide
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