Cisco 2811 ROUTER 2FE 1NME 4HWIC 2PVDM 2AIM IP BASE WITH A/C POWER SUPPLY Specification Guide

The key to solving problems is to isolate the problem to a specific subsystem by comparing what the 
router is doing to what it should be doing.

The LEDs on the front and rear panel of the router enable you to determine router performance and 
operation. LEDs are described in the following sections:

When solving problems, consider the following router subsystems:

Power and cooling systems—External power source, power cable, router power supply and circuit 
breaker, and router blower and fan. Also consider inadequate ventilation or air circulation. 

Modules—LEDs on the modules help identify a failure. 

Cables—External cables that connect the router to the network. 

Both the system LED and the fans can help you troubleshoot a power problem. Check the following 
items to help isolate the problem:

With the power switch on, the normal indications are:

SYS PWR LED on green and continuous

Fans operating

AUX/PWR LED on green and continuous, if the IP phone power module or Cisco Redundant Power 
Supply (RPS) is installed

Check the following symptoms to locate or eliminate faults in the power and cooling systems:

With the power switch on, is the SYS PWR LED on?

If the LED is green and continuous, the router is receiving power and is functional.

If the LED is amber, the router is receiving power but is not functional.

If the LED is off, check the power source and power cable. 

With the power switch on and the SYS PWR LED on and green, do the fans operate?

If no, check the fans.

If yes, the power system is functioning.

With the power switch on and the PWR SYS LED off, do the fans operate?

If yes, the router is receiving power. The fans are connected directly to the DC outputs of the 
power supply. 

If no, check the power source and power cable.