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Installing the Cisco ASR 920 Series Router

This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.

Warning

Install only in accordance with national and local wiring regulations. Statement 1045

Guidelines for DC-Powered Systems

Basic guidelines for DC-powered systems include the following:

• Each chassis power supply should have its own dedicated input power source. The source must comply

• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be

• The circuit breaker is considered the disconnect device and should be easily accessible.

• The system ground is the power supply and chassis ground.

• Do not connect the DC return wire to the system frame or to the system-grounding equipment.

• Use the grounding lug to attach a wrist strap for ESD protection during servicing.

• Ensure the DC return is grounded at the source side.

Guidelines for AC-Powered Systems

Basic guidelines for AC-powered systems include the following:

• Each chassis power supply should have its own dedicated branch circuit.

• The circuit breaker should be sized according to the power supply input rating and local or national code

• The AC power receptacles used to plug in the chassis must be the grounding type. The grounding

Prevent Power Loss

Use the following guidelines to prevent power loss to the router:

• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power

• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types

with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and

IEC 60950 standards.

sized according to the power supply input rating and local or national code requirements.

requirements.

conductors that connect to the receptacles should connect to protective earth ground at the service

equipment.

supplies is within the current ratings of the wiring and breakers.

that use ferroresonant technology. These UPS types can become unstable with systems such as the router,

which can have substantial current-draw fluctuations due to bursty data traffic patterns.

Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide

Guidelines for DC-Powered Systems