EXFO MaxTester 635 - Manual (Page 312)

Running DSL/IP Tests and Viewing Results
304 MAX-635
Band Information
Band Information
The Band Information tab allows you to view a list of individual upstream
or downstream band parameter details.
When the Test Interface for Auto or Manual Test is set to ADSL2+ or
VDSL2 bonding mode, there will be 2 pages of results, one for each DSL
line-pair.
To access the second-pair results, press the Pair 1/2 function key at the
bottom-right of the screen.

The page contains Upstream and Downstream
parameters. Press
to toggle between bands.

ADSL lists only 1 of each.

VDSL lists US0 to 3 and DS1 to 3 possible
bands, depending on the band plan.

Parameter - Downstream/Upstream

SNR Margin is the measured current
signal-to-noise ratio margin across all active
sub-carriers, as an amount of increased noise
relative to the measured noise power that the
system would be able to tolerate. Only a value
of 6 or above is able to support a bit error rate of 10
-7
.

Loop Attenuation is the current quality of the line and is measured
only once during testing.

Signal Attenuation is the current reduction of signal strength and
is measured periodically when the line is connected.

Tx Power is the upstream/downstream transmitting power for the
selected band.