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Preparing for Installation
Site Power Guidelines
The router have 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 router:
• The redundant power option provides a second, identical power supply to ensure that power to the chassis
• Connect each of the two power supplies to a separate input power source. If you fail to do this, your
• To prevent a loss of input power, be sure that the total maximum load on each circuit supplying the
• 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 lightning striking
This product requires short-circuit (overcurrent) protection to be provided as part of the building installation.
Caution
Install only in accordance with national and local wiring regulations.
The router installation must comply with all the applicable codes, and is approved for use with copper
Note
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.
For information on power specifications, see Power Supply Specification table.
Electrical Circuit Requirements
Each router requires a dedicated electrical circuit. If you equip the router with dual-power feeds, provide a
separate circuit for each power supply to avoid compromising the power redundancy feature.
The ruters can be powered by a DC source or an AC source. Ensure that equipment grounding is present and
observe the power-strip ratings. Make sure that the total ampere rating of all the products plugged into the
power strip does not exceed 80% of the rating.
Site Cabling Guidelines
This section contains guidelines for wiring and cabling at your site. When preparing your site for network
connections to the router, consider the type of cable required for each component, and the cable limitations.
continues uninterrupted if one power supply fails or input power on one line fails.
system might be susceptible to total power failure due to a fault in the external wiring or a tripped circuit
breaker.
power supplies is within the current ratings of the wiring and the breakers.
receiving clean power. Install a power conditioner, if necessary.
power lines or due to power surges. The chassis ground must be attached to a central office or other
interior ground system.
Cisco ASR-920-12SZ-IM Aggregation Services Router Hardware Installation Guide
Site Power Guidelines
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