Cisco Systems 7401ASR Installing the Router

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Cisco 7401ASR Installation and Configuration Guide

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Chapter2 Rack-Mounting, Tabl et op Installation, and Cabling Installing the Router

Figure2-2 Airflow Through the Chassis

When you plan the location and layout of your equipment rack or wiring closet, you need to con sider

how air flows through your router. The Cisco 7401ASR router draws cooling air in through the intake

vents on the front of the chassis and moves the air across the internal components and out the exhaust

vents on the rear of the chassis. Figure 2-2 shows airflow through the router.

Temperature sensors on the system board monitor the internal air temperature and send warning

messages when the internal air temperature approaches a specified threshold. If the internal temper ature

exceeds the specified threshold, the system environmental monitor shuts down all internal power to

prevent equipment damage from excessive heat. (See the “Environmental Monitoring and Reporting

Functions” section on page 3-4 for temperature threshold information.)

Installing the Router

This section explains how to install a Cisco 7401ASR router in a gene ral ta ble top or work benc h

installation and in a rack, and how to attach I/O, port adapter, and power cables. This section contains

the following topics:

•General Tabletop or Workbench Installation, page 2-5

•Rack-Mounting a Cisco 7401ASR Router, page 2-6

•Attaching the Chassis Rack-Mount and Cable-Management Brackets, page 2-7

•Installing the Chassis in the Rack, page 2-9

The router should already be in the area where you will install it, and your installation locat ion should

already be determined. If not, see the “Preparing to Install the Cisco 7401ASR Router” section on

page 2-1, the “Site Requirement Guidelines” section on page2-4, and the “Site Preparation and Safety”

section of the Cisco 7401ASR Regulatory Compliance and Safety Information document.

When installing a Cisco 7401ASR router on a workbench or tabletop, e nsure that the surface is clean and

in a safe location and that you have considered the following:

•The router requires at least 3 inches (7.62 cm) of clearance at the inlet and exhaust vent s (the fron t

and rear of the router).

•The router should be installed off the floor. (Dust that accumulates on the f loor is d rawn int o the

interior of the router by the cooling fans. Excessive dust inside the router can cause overtemperature

conditions and component failures.)

•There must be approximately 19 inches (48.3 cm) of clearance at the front and rea r of the router for

installing and replacing router parts—such as the port adapter, GBIC, or CompactFlash Disk—or

accessing network cables or equipment.

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