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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
Chapter2 Preparing for Installation
Site Planning
•Consideration has been given to the console port wiring and limitations of the cabling involved,
according to TIA/EIA-232F.
•The Cisco ASR 903 Router Ethernet cabling distances are within limitations.
•The equipment rack in which you plan to install the CiscoASR 903 Router complies with
requirements.
•In selecting the location of the rack, careful consideration has been given to safety, ease of
maintenance, and proper airflow.
Site Selection Guidelines
The Cisco ASR 903 Router requires specific environmental operating conditions. Temperature,
humidity, altitude, and vibration can affect the performance and reliability of the router. The following
sections provide specific information to help you plan for the proper operating environment.
The Cisco ASR 903 Router is designed to meet the industry EMC, safety, and environmental standards
described in the Regulatory, Safety, and Compliance Information for the CiscoASR 903 Router.

Environmental Requirements

The Cisco ASR 903 Router is is Telcordia GR-3108-CORE (Class 2) compliant.
Environmental monitoring in the CiscoASR 903 Router protects the system and component s from
damage caused by excessive voltage and temperature conditions. To ensure normal operation and avoid
unnecessary maintenance, plan and prepare your site configuration before installation. After installation,
make sure that the site maintains the environmental characteristics described in “System Specifications”
section on page 2.
For an outside plant installation (cell site cabinet, hut etc.), it is required that the Cisco ASR 903 Router
be protected against airborne contaminants, dust, moisture, insects, pests, corrosive gases, polluted air
or other reactive elements present in the outside air. To achieve this level of protection, we recommend
that the unit be installed in a fully sealed enclosure or cabinet. Examples of such cabinets include IP65
cabinets with heat exchanger complying with Telecordia GR487. Temperature must be maintained
within –40ºC to 65ºC.

Physical Characteristics

Be familiar with the physical characteristics of the CiscoASR 903 Router to assist you in placing the
system in the proper location. For more information, see the “System Specifications” section on page2.