•
Avoid locating the Cisco ASR 903 Router in a location in which the chassis air intake vents may draw
in the exhaust air from adjacent equipment. Consider how the air flows through the router; the airflow
direction is side to side, with ambient air drawn in from the vents located on the front right of the chassis.
•
Ensure that cables do not obstruct the air-inlet and air-exhaust grid of the chassis as it may lead to
improper ventilation, overheating of the equipment, and dust accumulation.
Air Flow Guidelines for Enclosed Rack Installation
To install a Cisco ASR 903 Router in a 4-post enclosed cabinet, the front and rear doors of the cabinet must
be removed or be perforated with a minimum of 65% open area (70% for ETSI 800mm racks).
If you are mounting the chassis in a 4-post enclosed cabinet, ensure that you have a minimum of 6 inches
(15.24 cm) of clearance on each side of the chassis.
Floor Loading Considerations
Ensure that the floor under the rack supporting the Cisco ASR 903 Routers is capable of supporting the
combined weight of the rack and all the other installed equipment.
To assess the weight of a fully configured Cisco ASR 903 Router, refer to Cisco ASR 900 Series Aggregation
Services Routers Data Sheet.
For additional information about floor loading requirements, consult GR-63-CORE, Network Equipment
Building System (NEBS) Requirements: Physical Protection.
Site Power Guidelines
The Cisco ASR 903 Router has specific power and electrical wiring requirements. Adhering to these
requirements ensures reliable operation of the system. Follow these precautions and recommendations when
planning your site power for the Cisco ASR 903 Router:
•
The redundant power option provides a second, identical power supply to ensure that power to the chassis
continues uninterrupted if one power supply fails or input power on one line fails.
•
In systems configured with the redundant power option, connect each of the two power supplies to
separate independent power source. If you fail to do this, your system might be susceptible to total power
failure due to a fault in the external wiring or a tripped circuit breaker.
•
To prevent a loss of input power, be sure that the total maximum load on each circuit supplying the
power supplies is within the current ratings of the wiring and the breakers.
•
Check the power at your site before installation and periodically after installation to ensure that you are
receiving clean power. Install a power conditioner if necessary.
•
Provide proper grounding to avoid personal injury and damage to the equipment due to lightning striking
power lines or due to power surges. The chassis ground must be attached to a central office or other
interior ground system.
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
66
Preparing for Installation
Floor Loading Considerations
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