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Cable Fault Locator Introduction

76 New and Enhanced Features in AlliedWare Plus 5.4.4 Major and Minor Versions

Introduction to the Cable Fault Locator

The Cable Fault Locator (CFL) is a cable diagnostic tool located within the switch. For a

selected port, the CFL will display connection status or faults that exist in either the

connecting cable itself, or its terminations.

Capabilities

The CFL is designed to operate on cable systems that utilize the following:

■ fixed copper ports, i.e. not using SFP type pluggable transceivers.

■ unshielded twisted pair data cables such as CAT 5 or CAT 6 and up to 100 meters

long.

■ cable terminations that use RJ-45 or RJ-0.5 connections.

■ data rates from 10 Mbps to 1 Gbps (10 Gbps over copper cable is not supported).

The CFL operates using a technology known as Time Domain Reflectometry (TDR) to test

all four pairs of wires inside the cable.

TDR Operating Principles

When a data cable is correctly terminated, the data energy traveling along it is absorbed

by its terminating load resistance. However, if the cable is unplugged, broken or short

circuited, this energy is reflected at the cable termination and travels back along the

cable towards its source connection.

To test the cable, the CFL generates a pulse at the cable source connection and monitors

the cable for the presence of a returning (reflected) pulse. By measuring the timing

between the transmitted and reflected pulses, the CFL can calculate the distance

between a fault (usually at the distant termination) and cable’s source connection. Also,

by detecting the polarity of the reflected signal, the CFL can determine whether the fault

is due to an open circuit, or a short circuit, condition.

Note that CFL cannot run on a port that is currently supplying power via PoE.

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AMF 110 Spezifikationen Seite 82