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990DSL
Users Guide
4-40
VF Noise Test
This test performs a “snapshot” measurement of the voice frequency Metallic
Noise (Nm) and Power Influence (PI) on the pair.
Setting Up a VF Noise Test
To set up a VF Noise test
,
select the test on the POTS Toolbox and press
D
(
Setups
).
Refer to Table 4-7 for VF Noise test setup parameters.
Table 4-7. VF Noise Test Setup Parameters
Parameter Settings
(default in bold)
Termination Impedance
600
e
or 900
e
Termination Mode
Terminated or Bridged
Measurement Filter
C-Msg, C-Notched, 3K Flat, 15K Flat
Nm Pass Threshold
≤
30 dBrn (Range = 0 to 99)
P.I. Pass Threshold
≤
80 dBrn (Range = 0 to 99)
Power Harmonics Units
dBm or dBrn
PH C-Message Filter
No or Yes
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