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Chapter 2
Preparing for Installation
Rack Selection Guidelines
The Cisco ASR 920 Series Router can be mounted in most two-post or four-post, 19-inch equipment
racks that comply with the Electronic Industries Association (EIA) standard for equipment racks
(EIA-310-D 19-inch). The rack must have at least two posts with mounting flanges to mount the chassis.
Caution
When mounting a chassis in any type of rack equipment, ensure that the inlet air to the chassis does not
exceed 70° C.
The distance between the center lines of the mounting holes on the two mounting posts must be 18.31
inch ± 0.06 inch (46.50 cm ± 0.15 cm). The rack-mounting hardware included with the chassis is
suitable for most 19-inch equipment racks.
Consider installing the Cisco ASR 920 Series Router in a rack with the following features:
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Caution
The Cisco ASR 920 Series Router is not recommended to be installed in an enclosed rack because the
chassis requires an unobstructed flow of cooling air to maintain acceptable operating temperatures for
its internal components. If you use an enclosed rack, ensure that the air flow requirements are maintained
as discussed in
Equipment Rack Guidelines
The placement of a rack can affect personnel safety, system maintenance, and the system's ability to
operate within the environmental characteristics. Choose a proper location for the
Cisco ASR 920 Series Router by following the guidelines described here.
Locating for Safety
If the Cisco ASR 920 Series Router is the heaviest or the only piece of equipment in the rack, consider
installing it at or near the bottom to ensure that the rack's center of gravity is as low as possible.
For additional information about the proper placement of electronic equipment, consult the
GR-63-CORE, Network Equipment Building System (NEBS) Requirements: Physical Protection
document.
Locating for Easy Maintenance
It is recommended that you maintain a minimum clearance distance as mentioned below, at all times.
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OL-32751-01
NEBS-compliant, 19-inch wide (48.3-cm) rack.
EIA or European Telecommunications Standards Institute (ETSI) hole patterns in the mounting
rails. The required mounting hardware is shipped with the Cisco ASR 920 Series Router. If the rack
that you plan to install the system in has metric-threaded rails, you must provide your own
metric-mounting hardware.
Perforated top and open bottom for ventilation to prevent overheating.
Leveling feet for stability.
Air Flow Guidelines, page
front clearance—12.7 cm
rear clearance—10 cm
Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide
2-11.
Site Planning
2-17