Exfo VDSL2 Manual do Utilizador descarregar pdf (Página 111)

VF Tests

Copper, VDSL2, ADSL2+ and IP Triple-Play Test Set 103

Longitudinal Balance

The Long. Balance test allows you to

check that the VF longitudinal balance

ratio for the twisted pair complies with

applicable standards so as to reduce

the effects of common-mode voltage

to ground. The better the longitudinal

balance of the cable pair, the higher

the dB reading.

To start/stop the test:

Press to start/stop the test.

Test results are displayed on the screen as they are completed.

Load Coil Detection

The Load Coil detection test allows

you to detect the presence of load

coils, which are detrimental to the use

of DSL technologies on the line. If a

load coil is detected, use the time

domain reflectometry (TDR) test to

quickly locate and remove it from the

cable.Test results are displayed in

graphical form.

To move the screen pointer:

Press the left/right arrow key to move the screen pointer. The pointer value

updates dynamically.

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Exfo VDSL2 Manual do Utilizador Página 111