Filter
Top Products
A-2
Cisco ASR 901 10G Series Aggregation Services Router Hardware Installation Guide
OL-28105-02
Appendix A Troubleshooting
Problem Solving
Troubleshooting the Power and Cooling Systems
See Table A-1 for information to help you isolate the problem.
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 A-2 for help in interpreting environmental reporting features.
Table A-1 Troubleshooting the Power and Cooling Systems
Symptom Possible Cause Corrective Action
The power (labeled PWR) LED
on the front panel is not on.
The power source is not
connected properly.
Note When the Cisco ASR
901 10G router (DC
unit) is powered ON, it
takes about 30 seconds
for the system LED to
turn ON.
Check the DC or AC input.
Check the DC or AC source.
The router shuts down after
being on for only a short time.
The cause is environmental. Check for an environmentally
induced shutdown. (See
“Environmental Reporting
Features” section on page A-2).
The fans do not work; the router
overheats and shuts down.
Check the fans.
The chassis intake and exhaust
vents are obstructed.
Check the chassis intake and
exhaust vents for obstructions.
Clear any obstructions.
Installation does not meet
environmental site
requirements.
Check the environmental site
requirements in the “System
Specifications” on page -9.
The router partially boots, but
the LEDs do not come on.
There is a possible power supply
failure.
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.