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Hardware Installation Guide for the Cisco 4000 Series  Integrated Services Router
OL-32185-02
Chapter 1      Overview of Cisco 4000 Series ISRs
  Hardware Features of Cisco 4000 Series ISRs
USB Serial Console Port
The Mini-USB type B serial port can be used as an alternative to the RJ-45 console port. For Windows 
operating systems earlier than Windows 7, you must install a Windows USB device driver before using 
the USB console port. 
Front Panel PoE+ Ports
On Cisco 4451-X ISR and Cisco 4351 ISR, two front panel Ethernet ports are PoE+ (802.3at) compliant 
ports. These are ports GE 0/0/0 and GE 0/0/1. Cisco 4431 ISR, Cisco 4321 ISR and Cisco 4221 do not 
support front panel PoE+. 
System PoE power supplies do not provide power to the front panel ports. 
Internal PoE Daughter Card
The internal PoE daughter card provides a total of 30.8 watts of power across the two ports.
LED Indicators
Table 1-2 summarizes the LED indicators that are located in the router bezel or chassis, but not on the 
interface cards and modules. 
Note For module LEDs, please refer to the respective module installation guides for each module.
Table 1-2 LED Descriptions (Applies to the Cisco  4451-X ISR, Cisco 4431 ISR, and Cisco 4351 ISRs)
LED Represents Color Description Location Available On
STAT System 
Status
Solid 
green
System operates normally.  Bezel side All models
Blinking 
amber
BIOS/Rommon is booting.
Amber BIOS/Rommon has completed booting, and system 
is at Rommon prompt or booting platform software.
Off System is not out of reset or BIOS image is not 
loadable.
TEMP Temperature 
Status
Solid 
green
All temperature sensors in the system are within 
acceptable range.
Bezel side All models
Amber One or more temperature sensors in the system are 
outside the acceptable range.
Off Temperature is not being monitored.