Troubleshooting The Power And Cooling Systems; Environmental Reporting Features - Cisco 901 Installation Manual

Problem Solving
•

Troubleshooting the Power and Cooling Systems

See
Table A-1
Symptom
The power (labeled PWR) LED
on the front panel is not on.
The router shut down after being
on for only a short time.
The router partially boots, but
the LEDs do not light.

Environmental Reporting Features

The Cisco ASR 901 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
reporting features.
Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
A-2
Cables—Ensure that the external cables connecting the router to the network are all secure.
Table A-1 for information to help you isolate the problem.
Troubleshooting the Power and Cooling Systems
Possible Cause
The power source is not
connected properly.
The cause is environmental.
The fans do not work; the router
overheats and shuts down.
The chassis intake and exhaust
vents are obstructed.
Installation does not meet
environmental site
requirements.
There is a possible power supply
failure.
Table A-2 for help in interpreting environmental
Appendix A Troubleshooting
Corrective Action
Check the DC input.
Check the DC source.
Check for an environmentally
induced shutdown. (See
"Environmental Reporting
Features" section on page
Check the fans.
Check the chassis intake and
exhaust vents for obstructions.
Clear any obstructions.
Check the environmental site
requirements in the "System
Specifications" on page -7.
Check the power 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-23778-01
A-2).