7 Operation on xDSL accesses
66
ARGUS 165
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 62).
<Menu>
Opens the graph functions (see
page 62).
Continued on next
page
Additional result graphs
Содержание 165
Страница 26: ...4 Quick start guide 26 ARGUS 165 ...
Страница 37: ...5 Configuring accesses ARGUS 165 37 Test parameter settings are described starting on page 124 ...
Страница 170: ...15 IP tests 170 ARGUS 165 ...
Страница 235: ...19 Parallel tests ARGUS 165 235 ...
Страница 284: ...23 Copper tests 284 ARGUS 165 ...