Exfo VDSL2 Uživatelský manuál stáhnout pdf (Strana 97)

Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set 89

7Fault Location Tests

Fault location tests are used to locate faults in the loop. The AXS-200/635

uses the following types of fault location tests:

³ TDR

³ RFL Single Pair (2 wire)

³ RFL Separate Good Pair (4 wire)

³ Loop Mapper

To view fault location test panes or tabs:

1. From the Fault Location pane use

the up or down arrow key to

highlight the desired test, then

press .

2. Press the F1, F2, or F3 key to view

available tabs. To view any

available additional tabs, use the

function arrow keys on either side

of the F1 and F3 keys.

TDR Test

The time domain reflectometry (TDR) test allows you to easily locate

bridge taps (multiple appearances), the end of the cable, open ends,

shorted ends, splices, split pairs, and wet sections in a cable. It also allows

you to estimate cable lengths.

A TDR test transmits a fast pulse along the cable, then measures the

resulting reflected pulse as a function of time, and displays the results as a

function of the cable length or time.

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Exfo VDSL2 Uživatelský manuál Strana 97