Rack Selection Guidelines; Equipment Rack Guidelines - Cisco ASR 903 Hardware Installation Manual

Preparing for Installation
• Do not step on or stand on any component or system when servicing other systems or components in a
rack.
• When mounting the Cisco ASR 903 Router in a partially filled rack, load the rack from the bottom to
the top, with the heaviest component at the bottom of the rack.
• If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the
unit in the rack.

Rack Selection Guidelines

The Cisco ASR 903 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.
When mounting a chassis in any type of rack equipment, ensure that the inlet air to the chassis does not
Caution
exceed 65°C.
The distance between the center lines of the mounting holes on the two mounting posts must be 18.31 inches
± 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 903 Router in a rack with the following features:
• Network Equipment Building System (NEBS) compliant, 19-inch (48.3 cm) wide rack.
• EIA or European Telecommunications Standards Institute (ETSI) hole patterns in the mounting rails.
The required mounting hardware is shipped with the Cisco ASR 903 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.
The Cisco ASR 903 Router should not be installed in an enclosed rack because the chassis requires an
Note
unobstructed flow of cooling air to maintain acceptable operating temperatures for its internal components.
Installing the router in any type of enclosed rack—even with the side doors removed —could disrupt the
air flow, trap heat next to the chassis, and cause an overtemperature condition inside the router. If you use
an enclosed rack, ensure that there are air vents on all sides of the rack and there is proper ventilation.

Equipment Rack Guidelines

The placement of the rack can affect personnel safety, system maintenance, and the system's ability to operate
within the environmental characteristics described in the
Data Sheet.
Choose a proper location for the Cisco ASR 903 Router by following the guidelines listed below.
Cisco ASR 900 Series Aggregation Services Routers
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
Rack-Mounting Guidelines
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