EXFO FTB-635 Wideband Copper and DSL Test Module - Manual (Page 275)

Impulse Tests
Copper and xDSL Tests 267
VF Impulse Noise Test
The page allows you to set the following parameters:

VF Noise filter allows you to define the voice frequency noise filter to
be used, dependent on ITU or ANSI Standard mode.

Test Duration allows you to set the length of time to run the test from a
list of values.

Termination Resistance allows you to define the resistance of the
dummy load connected to the line, by selecting either 600
Ω or
Bridging (100 k Ω ).
Setting Threshold Values
The Test Thresholds page allows you to set the VF Impulse Noise
Threshold values for the test.
To set the Threshold values:
1. From the Copper main menu Test Groups, select Noise test
.
2. From the Tests menu, select VF Impulse Noise test.
3. Tap VF Impulse tab.
4. Tap Edit Thresholds button to open the Test Thresholds page.
5. Set the Threshold values as required.
6. Tap Close to confirm and exit the page.