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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
  Chassis Views
Platform Summary
Figure 1-8 shows the internal view of Cisco 4431 ISR with parts and module locations.
Figure 1-8 Platform Summary of the Cisco 4431 ISR
1 DIMMs 2 Forwarding plane processor
3 Control plane processor 4 NIMs
5 SFP GE ports 6 PVDM card