Installing The Router; General Tabletop Or Workbench Installation - Cisco 7401ASR Installation And Configuration Manual

Chapter 2 Rack-Mounting, Tabletop Installation, and Cabling
Figure 2-2 Airflow Through the Chassis
When you plan the location and layout of your equipment rack or wiring closet, you need to consider
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.
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 temperature
exceeds the specified threshold, the system environmental monitor shuts down all internal power to
prevent equipment damage from excessive heat. (See the
Functions" section on page 3-4

Installing the Router

This section explains how to install a Cisco 7401ASR router in a general tabletop or workbench
installation and in a rack, and how to attach I/O, port adapter, and power cables. This section contains
the following topics:
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General Tabletop or Workbench Installation

The router should already be in the area where you will install it, and your installation location should
already be determined. If not, see the
page
section of the Cisco 7401ASR Regulatory Compliance and Safety Information document.
When installing a Cisco 7401ASR router on a workbench or tabletop, ensure that the surface is clean and
in a safe location and that you have considered the following:
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OL-5419-01 B0
ENH ANC ED
ATM
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
2-1, the "Site Requirement Guidelines" section on page
The router requires at least 3 inches (7.62 cm) of clearance at the inlet and exhaust vents (the front
and rear of the router).
The router should be installed off the floor. (Dust that accumulates on the floor is drawn into 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 rear of the router for
installing and replacing router parts—such as the port adapter, GBIC, or CompactFlash Disk—or
accessing network cables or equipment.
Figure 2-2 shows airflow through the router.
"Environmental Monitoring and Reporting
for temperature threshold information.)
"Preparing to Install the Cisco 7401ASR Router" section on
Cisco 7401ASR Installation and Configuration Guide

Installing the Router

2-4, and the "Site Preparation and Safety"
2-5