Cisco Systems ASR 901 10G Manual Do Utilizador

See 

 for information to help you isolate the problem.

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 

 for help in interpreting environmental reporting features.

The power (labeled PWR) LED 
on the front panel is not on.

The power source is not 
connected properly.

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 

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 

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.