EXFO FTB-635 Wideband Copper and DSL Test Module - Manual (Page 273)

Impulse Tests
Copper and xDSL Tests 265
VF Impulse Noise Test
VF Impulse Noise Test
The VF Impulse Noise test allows you to measure voice frequency impulse
noise on the circuit under test. The test counts and compares the number
of short duration impulse noise spikes exceeding the threshold counters in
the voice band to quickly understand the impulse rate affecting the circuit.
VF Impulse
The VF Impulse function displays and updates results in real time, for the
length of time set in Test Duration or less if you stop the test. The last valid
results then remain displayed.
To access VF Impulse page:
1. From the Copper main menu Test Groups, select Impulse test
.
2. From the Tests menu, select VF Impulse Noise test to start the test.
By default, the VF Impulse page opens.
The current group and the current test which is being measured is
displayed in the status bar, for example Impulse\VF Impulse Noise.