EXFO MaxTester 635 - Manual (Page 171)

Noise Tests
Copper and VDSL2/ADSL2+ Multi-play Test Set 163
NEXT
However, you can check the connection diagram at any time by
pressing the Hookup Diagram button. In this case, the test does
not start when you press the Ok button to close the Confirmation
window.

Threshold Settings button opens a new page that allows you to set the
NEXT Spot Threshold for the test.

Step -> Freq button automatically enters/transfers the Frequency
Step value into the Frequency value. If the step size is less than 10 kHz
(but not 4.3125 kHz), the Frequency value will be set to 10 kHz. If the
Frequency Step is set to 4.3125 kHz, the Frequency value will be set to
8.6250 kHz.

Result displays the pass/fail status, NEXT and Frequency (TX) values.

Test Status displays the current state of measurement or an error
message.