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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
For detailed information on LEDs, see the “LED Indicators” section on page 1-27.
Platform Summary
Figure 1-16 shows the internal view of the Cisco 4431 ISR with parts and module locations.
Figure 1-16 Platform Summary of Cisco 4331 ISR Chassis
1 Double-wide NIM 2 NIMs
3 Removable module slot divider 4 SM-X slot
5 Ground connection
1 DIMMs 2 CPU
3 ISC slot 4 SM-X slot
5 NIM slot