Cisco Systems 7401ASR manual Installing the Router, General Tabletop or Workbench Installation

Chapter 2 Rack-Mounting, Tabletop Installation, and Cabling

Installing the Router

Figure 2-2 Airflow Through the Chassis

	D			R
	LE		LS	RIE	M
AB		EL		AR	AR
EN		XC	XC	AL
	R		R	RX

TX RX

ENHANCED ATM

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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. Figure 2-2shows 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 temperature 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 3-4for temperature threshold information.)

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:

•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

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 “Preparing to Install the Cisco 7401ASR Router” section on page 2-1, the “Site Requirement Guidelines” section on page 2-4, 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, ensure 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 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.

Cisco 7401ASR Installation and Configuration Guide

OL-5419-01 B0 2-5