EXFO MaxTester 635 - Manual (Page 313)

Running DSL/IP Tests and Viewing Results
Copper and VDSL2/ADSL2+ Multi-play Test Set 305
Loop Diagnostics
Loop Diagnostics
The Loop Diagnostics tab displays characteristics
and potential problems on the line, in graphical
format. There are 3 separate graphs for each pair:

Downstream SNR per Bin presents the
downstream signal-to-noise ratio per bin.

Downstream ATTN per Bin shows the
downstream attenuation from Hlog (Channel
Response).

Downstream QLN per Bin shows the
downstream PSD noise from quiet line noise.
Press to switch between graphs.