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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, follow the instructions under "Displaying a Setup
Menu" in Chapter 3. Refer to Table 4-7 for VF Noise test setup parameters.
Table 4-7. VF Noise Test Setup Parameters
Parameter
Termination Impedance
Termination Mode
Measurement Filter
Nm Pass Threshold
Nm Pass Threshold
VF Noise Test Results
To run this test, follow the instructions under "Starting and Stopping a Test in
the POTS Toolbox", earlier in this chapter.
Figure 4-24 is an example of a VF Noise test results screen. In this example,
the pair has acceptable Metallic Noise (Nm), but the Power Influence (PI)
value is above the acceptable threshold as defined in Setups.
POTS Testing and Fault Location
The POTS Toolbox
Settings (default in bold)
600 e or 900 e
Terminated or Bridged
C-Msg, C-Notched, 3K Flat, 15K Flat
≤ 30 dBrn
≤ 80 dBrn
(Range = 0 to 99)
(Range = 0 to 99)
4
4-41
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