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Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
OL-27644-01
Chapter 2 Preparing for Router Installation
Rack Requirements
Physical Characteristics
Be familiar with the physical characteristics of the Cisco ISR 4451-X to assist you in placing the system
in the proper location.
Table 2-2 shows the weight and dimensions of the Cisco ISR 4451-X.
The following list describes additional Cisco ISR 4451-X chassis characteristics:
• Chassis height meets EIA-310 rack spacing 2RU (3.5 inches/88.90 mm.), universal rack-mount
• Chassis width meets EIA-310 19-inch (17.25 inches/438.15 mm) wide with rack brackets
• Cable-management brackets at each Cisco ISR 4451-X locations can hold 16 ports of STP/UTP RJ
45 cables
• Cable-management brackets allow a bend radius of 1.5 inches for cables
• Adjustable rack-mount brackets allow for a front to rear rail variance distance of 15.50/394mm to
19.00/482.6mm
Rack Requirements
Some Cisco routers include brackets for use with a 19-inch rack or, if specified in your order, optional
larger brackets for use with a 23-inch rack.
The following information can help you plan your equipment rack configuration:
• Allow clearance around the rack for maintenance.
• Allow at least one rack unit of vertical space between routers.
• Enclosed racks must have adequate ventilation. Ensure that the rack is not congested, because each
router generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air.
Heat generated by equipment near the bottom of the rack can be drawn upward into the intake ports
of the equipment above it.
• When mounting a chassis in an open rack, ensure that the rack frame does not block the intake or
exhaust ports. If the chassis is installed on slides, check the position of the chassis when it is seated
in the rack.
Table 2-2 Physical Characteristics of Cisco ISR 4451-Xs
Characteristics Cisco ISR 4451-Xs
Height 3.5 in. (8.89 cm.)—2RU rack-mount
Width 17.25 in. (43.815 cm.)—19-inch rack-mount
Depth 18.7 in. (47.498 cm.)
(including card handles, cable-management brackets, power supply
handles)
Weight 38-40 lbs (17.23-18.14 kg)
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