Floor Loading Considerations; Site Power Guidelines; Electrical Circuit Requirements - Cisco ASR-920-12CZ-A Hardware Installation Manual

Site Planning

Floor Loading Considerations

Ensure that the floor under the rack supporting the Cisco ASR 920 Series 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 920 Series Router, see the
For additional information about floor loading requirements, see the GR-63-CORE, Network Equipment
Building System (NEBS) Requirements: Physical Protection document.

Site Power Guidelines

The Cisco ASR 920 Series 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 920 Series Router:
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This product requires short-circuit (overcurrent) protection to be provided as part of the building
Caution
installation. Install only in accordance with national and local wiring regulations.
The Cisco ASR 920 Series Router installation must comply with all the applicable codes, and is
Note
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.
For information on power specifications, see

Electrical Circuit Requirements

Each Cisco ASR 920 Series 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 Cisco ASR 920 Series Routers 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.
Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide
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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.
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.
Table 1-2.
Chapter 2 Preparing for Installation
Table 1-1.
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