Cisco Systems ASR 903 Floor Loading Considerations, Site Power Guidelines

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Cisco ASR 903 Router Hardware Installation Guide

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Chapter2 Preparing for Installation

Site Planning

To install a CiscoASR 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 CiscoASR 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 CiscoASR 903 Router, refer to “System Specifications”

section on page 1-2.

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 CiscoASR 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

a separate input 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.

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 Cisco ASR 903 Router installation must comply with all the applicable codes and is approved for

use with copper conductors only. The ground bond fastening hardware should be of compatible material

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 at a minimum.