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E-series Hardware Guide

32 ! Cabling Recommendations

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-recommended maximum

speeds and distances for signaling purposes. For information about attenuation

and power loss in optical fiber cables see:

! ANSI T1.646a-1997 Telecommunications – 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)

! 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.

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