Cisco ASR 901S Series Troubleshooting page 2

Troubleshooting the Power and Cooling Systems
• Power and cooling systems—External power source, power cable, router power supply, and circuit
• Modules—Checking the LEDs on the modules can help you to identify a failure.
• Cables—Ensure that the external cables connecting the router to the network are all secure.
Troubleshooting the Power and Cooling Systems
Symptom
The System LED on the bottom
panel is not on.
The router shuts down after being
on for only a short time.
The router partially boots, but the
LEDs do not come on.
Environmental Reporting Features
The router has a temperature sensor to detect over temperature conditions inside the chassis. When over
temperature is detected it is reported to the processor as an interrupt, where the software generates the
appropriate alarms. If the router reaches a temperature of 248°F (120°C), the power supply cycles itself to
prevent the router from exceeding the maximum temperature while being powered up.
See the following table for help in interpreting environmental reporting features.
Cisco ASR 901S Series Aggregation Services Router Hardware Installation Guide
2
breaker. Also check for inadequate ventilation or air circulation.
Possible Cause
The cause is environmental.
Light pipe is not connected
properly.
The power source is not connected
properly.
The chassis intake and heat sink
fins are obstructed.
Installation does not meet
environmental site requirements.
There is a possible power supply
failure.
Troubleshooting
Corrective Action
Check for an environmentally
induced shutdown. (See
Environmental Reporting Features,
on page 2.)
Check the light pipe connection.
• Check the DC or AC input.
• Check the DC or AC source.
Check the chassis intake and heat
sink fins for obstructions. Clear any
obstructions.
Check the environmental
specifications table in Table
Check the Management LED on
the front panel of the router. If the
LED is on, the power supply is
functional. If the LED is off, refer
to the Cisco Information Packet for
warranty information or contact
customer service.
OL-29732-02
3.