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

 summarizes the power options for Cisco 2800 series routers. Cisco 2801 routers are equipped 

for operation using AC power only. Cisco 2811, Cisco 2821, and Cisco 2851 routers can be equipped for 
operation using either AC or DC input power by installation of the appropriate chassis power supply. IP 
phone power is supported if the appropriate AC-input chassis power supply is installed.

 and 

 summarize the LED indicators that are located in the router bezel or chassis, but not 

in removable modules or interface cards. 

Cisco 2801

AC input without IP phone power 
output

100 - 240 VAC, 2 A

None

AC input with IP phone power 
output

100 - 240 VAC, 5 A

–48 VDC, 120 W

Cisco 2811

AC input without IP phone power 
output

100 - 240 VAC, 2 A

None

AC input with IP phone power 
output

100 - 240 VAC, 4 A

–48 VDC, 160 W

DC input without IP phone power 
output

24 - 60 VDC, 8 A

None

Cisco 2821

AC input without IP phone power 
output

100 - 240 VAC, 3 A

None

AC input with IP phone power 
output

100 - 240 VAC, 8 A

–48 VDC, 240 W

DC input without IP phone power 
output

24 - 60 VDC, 12 A

None

Cisco 2851

AC input without IP phone power 
output

100 - 240 VAC, 3 A

None

AC input with IP phone power 
output

100 - 240 VAC, 8 A

–48 VDC, 360 W

DC input without IP phone power 
output

24 - 60 VDC, 12 A

None

Cisco 2811, 
Cisco 2821, and 
Cisco 2851

Backup power for AC- or 
DC-powered routers:

Cisco Redundant Power System 
(RPS-675)

100 VAC, 10 A, 
or 240 VAC, 6 A

The Cisco RPS provides IP phone power 
only if the chassis power supply supports 
IP phone power.

With Cisco 2811: –48 VDC, 160 W

With Cisco 2821: –48 VDC, 240 W

With Cisco 2851: –48 VDC, 360 W