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WB Noise/Level Test
The WB Noise / Level test measures metallic noise or signal level present on a
pair. The test provides a snapshot wideband measurement on either spare pairs
(in the Terminated mode) or on active pairs (in the Bridged mode).
The test employs DSP techniques to perform measurements at multiple
frequencies at the same time. Depending on the choices you make in the test
Setups, the CopperPro takes measurements with either the higher resolution
Nyquist frequency set (
The "Fine" (Nyquist) frequency set enables measurements at more than 2000
frequency points across the band, which results in very fine resolution for tests
on spare pairs. The "Coarse" (DMT) frequency set enables measurements at
the standard 256 ADSL DMT bin frequencies, which can be helpful when you
monitor active ADSL lines. The Fine Mode may also be used on ADSL lines,
allowing energy outside the DMT bins to be visualized (such as disturber or
AM radio interference).
Setting Up a WB Noise/Level Test
To set up a WB Noise / Level test, follow the instructions under "Displaying a
Setup Menu" in Chapter 3. Refer to Table 5-2 for Setup parameters for the test.
Table 5-2. WB Noise/Level Test Setup Parameters
Parameter
Termination Mode
Measurement Filter
Measurement Mode
Noise Pass Threshold
WB Weighted Noise Pass
Threshold
XDSL Testing and Loop Qualification
) or with the ADSL DMT frequency set (
Fine
Terminated or Bridged
G (ADSL) , None, E (ISDN BR), F (HDSL)
Fine (Nyquist) or Coarse (DMT)
≤ -50 dBm
≤ 55 dBrn
The XDSL Toolbox
Setting (default in bold)
(Range = 0 to -99)
(Range = 0 to 99)
5
).
Coarse
5-19
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