Chapter 1 Overview of the Cisco 4451-X Integrated Services Router

About Slots and Interfaces

Fans, Ventilation, and Airflow

Chassis Ventilation

An internal fan tray consisting of 4 fans provides chassis cooling. An onboard temperature sensor controls the fan speed. The fans are always on when the router is powered on. Under most conditions, the fans operate at the slowest speed to conserve power and reduce fan noise. The fans operate at the higher speeds when necessary under conditions of higher ambient temperature. To replace a fan tray, see the “Replacing a Fan Tray” section on page 6-34.

Figure 1-8shows the Cisco ISR 4451-X airflow.

Figure 1-8 Cisco ISR 4451-X Airflow)

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About Slots and Interfaces

This section covers the following topics:

About Slot, Subslot (Bay), and Port Numbering, page 1-17

Slot Numbering, page 1-19

Subslot/Bay Numbering, page 1-20

Gigabit Ethernet Management, page 1-20

About Fixed Interfaces, page 1-20

About Slot, Subslot (Bay), and Port Numbering

The Cisco ISR 4451-X supports two types of interface modules: Enhanced Service Modules (SMs) and Network Modules (NIMs).

 

 

Hardware Installation Guide for the Cisco 4451-X Integrated Services Router

 

 

 

 

 

 

OL-27644-01

 

 

1-17

 

 

 

 

 

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Cisco Systems ISR4451XK9 manual About Slots and Interfaces, Fans, Ventilation, and Airflow