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

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Installing and Upgrading Internal Modules in Cisco 2800 Series Routers
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  Replacing the Power Supply
Figure 44
Removing the Power Supply from a Cisco 2821 or Cisco 2851 Router
Installing an AC-Input Power Supply
The AC-input power supply has a single power connector, as shown in 
Figure 45
AC_Input Power Supply
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Primary power connector
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