Juniper Networks E-Series manual Cabling Recommendations

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CHAPTER 3

Installation Guidelines and Requirements

Cabling Recommendations

You may want to consult the document GR-63 (LSSGR, FD-15): Network

Equipment Building System (NEBS) Requirements: Physical Protection,

Issue 1, October 1995 for additional cable recommendations.

Comply with the following recommendations:

•Use only shielded cables.

•Ensure that cable distance and rate limits meet IEEE-recommendedmaximum speeds and distances for signaling purposes. For information about attenuation and power loss in optical fiber cables see:

>ANSI T1.646a-1997Telecommunications – Broadband ISDN - Physical Layer Specification for User-Network Interfaces Including DS1/ATM (1997)

>ANSI T1.646-1995 Telecommunications – Broadband ISDN - Physical Layer Specification for User-Network Interfaces Including DS1/ATM (1995)

>AT&T (Lucent) Technical Note Power Margin Analysis (November 1995)

•Ensure that power cables deliver sufficient power to the system.

•Attach laser fiber connectors only to Class 1 laser devices in accordance with IEC 825-1, Safety of Laser Products - Part 1.

•Route cables so that they do not restrict ventilation or airflow.

•Route cables so that modules and field-replaceable units are easily accessible.

•Route cables in a logical direction to prevent loss of connectivity to other equipment in the rack, associated equipment in adjacent racks, or to the backbone network.

•Consider using cable-management brackets to keep network cables untangled and orderly and to prevent cables from hindering access to other slots.

•For specifications on cables for line modules, see Chapter 12, Module Specifications.