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Airflow Guidelines for ETSI Rack Installation
Airflow Guidelines for ETSI Rack Installation
When you install a device on a 2 or 4-post rack, the front and rear doors of the cabinet must be removed. We
recommended that you always maintain a minimum clearance distance as mentioned the following.
• Front clearance—5 inches (12.7 centimeters)
• Rear clearance—3.93 inches (10 centimeters)
To mount the chassis in a 4-post enclosed cabinet, ensure a minimum of 3.93 inches (10 centimeters) of
clearance on each side of the chassis.
Floor Loading Considerations
Ensure that the floor under the rack supporting the chassis is able to support the combined weight of the rack
and all the other installed equipment.
For additional information about floor loading requirements, see the
Building System (NEBS) Requirements: Physical Protection
Site Power Guidelines
The chassis 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 chassis:
• The redundant power option provides a second, identical power supply to ensure uninterrupted power
• Connect each power supply to a separate input power source. Otherwise, it results in total power failure
• To prevent loss of input power, ensure that the maximum load on each circuit is within the current ratings
• Check the power at your site before installation, and periodically after installation, to ensure that you are
• Provide proper grounding to avoid personal injury and damage to the equipment due to power surges or
Caution
This product requires short-circuit (overcurrent) protection to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations.
Note
The chassis installation must comply with all the applicable codes, and is approved for use with only copper
conductors. The ground bond-fastening hardware must be compatible and preclude loosening, deterioration,
and electrochemical corrosion of hardware and joined material. Attachment of the chassis ground to a central
office or other interior ground system must be made with a 6-AWG gauge wire copper ground conductor.
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
18
supply.
to the system due to a fault in the external wiring or a tripped circuit breaker.
of the wiring and the breakers.
receiving clean power. If necessary, install a power conditioner.
lightning striking power lines. The chassis ground must be attached to a central office or other interior
ground system.
Prepare for Installation
GR-63-CORE, Network Equipment
document.
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