Cisco ASR 9000 Series Manual page 53

Preparing for installation

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Preparing for Installation

A separate ground connection is not required for the version 2 or version 3 power systems. For more

Note

information see the

The color coding of source DC power cable leads depends on the color coding of the site DC power source.

Because there is no color code standard for source DC wiring, be sure that power source cables are connected

to the power modules using the proper positive (+) and negative (–) polarity:

• In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This is a

relatively safe indication of the polarity, but you must verify the polarity by measuring the voltage

between the DC cable leads . Be sure that the positive (+) and negative (–) cable leads match the positive

(+) and negative (–) labels on the power module when making the measurement.

• Green (or green and yellow) cable typically indicates that it is a ground cable.

DC power modules contain reverse voltage protection circuitry to prevent damage to the power module

Caution

if it detects a reverse polarity condition. No damage should occur from reverse polarity, but you should

correct a reverse polarity condition immediately.

For a list of the nominal and acceptable value ranges for source DC power, see Technical Specifications

chapter from Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide

NEBS Supplemental Unit Bonding and Grounding Guidelines, on page

Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide

Site Requirement Guidelines

54.

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