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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
Slots, Subslots (Bay), Ports, and Interfaces in Cisco 4000 Series ISRs
Figure 1-28 Cisco 4321 ISR Airflow
Figure 1-29 Cisco 4221 ISR Airflow
Slots, Subslots (Bay), Ports, and Interfaces in Cisco 4000
Series ISRs
The routers supports two types of interface modules: Enhanced Service Modules (SM-X) and Network
Modules (NIMs).
1 Exhaust 2 Intake
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