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7 Operation on xDSL accesses
54
ARGUS 152
Display of signal-to-noise ratio (SNR) for
each tone
y-axis: SNR in dB
x-axis: tones (channels)
This enables interference sources for
individual tones (channels) to be detected,
in this example downstream power backoff
(DPBO).
Display of quiet line noise (QLN) for each
tone. The QLN represents the quiet line
noise of the twisted pair as a function of
the frequency.
y-axis: QLN in dBm/Hz
x-axis: tones (channels)
The QLN enables detection of narrow-
band interference sources due to e.g.
coupling of medium-wave emission
sources or defective switching
components. These interference sources
are represented as narrow peaks. This
example shows a line with interference
from a power supply.
<Menu>
Opens the graph functions (see
page 50).
<Menu>
Opens the graph functions (see
page 50).
Continued on next
page
Additional result graphs