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

Rack-Mounting Guidelines
• 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 as a satellite shelf 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 as a satellite shelf 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 degrees 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 as a satellite shelf 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. 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 as a satellite shelf should not be installed in an enclosed rack because the
Note
chassis requires an 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 airflow, 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 Cisco ASR 903 System Specifications section. Choose
a proper location for the Cisco ASR 903 Router as a satellite shelf by following these guidelines.
Cisco ASR 9000 Series Aggregation Services Router Satellite Systems Installation Guide
16
Installing the Cisco ASR 903 Router as a Satellite Shelf