EXFO VDSL2 - Manual (Page 38)

Auto Tests
30 AXS-200/635i
Configuring CQ Auto Tests
VF Test Parameters
The VF Parameters tab allows you to
set up parameters used in the voice
frequency tests.
Each parameter is described below:
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Noise Metallic Filter defines the
level of voice frequency noise
filtering. If the ANSI standard is
used, the available choices are:
NONE, C-MESSAGE, C NOTCHED,
3 kHz FLAT, D-FILTER or 15 kHz. If the ITU standard is used, the
available choices are: NONE, PSOPHOMETRIC, P-NOTCHED,
3 kHz FLAT, D-FILTER or 15 kHz.
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VF Termination defines if the unit uses normal test impedance
termination or high bridging impedance when the cable is active or
terminated by other external equipment. For normal test termination
select TERMINATED, otherwise select BRIDGING.
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Imp. Noise Filter defines the type of impulse noise filtering to use. If
ANSI standard is used, the available choices are: NONE, C-MESSAGE,
C NOTCHED, 3 kHz FLAT, D-FILTER or 15 kHz. For the ITU standard,
the choices are: NONE, PSOPHOMETRIC, P-NOTCHED, 3 kHz FLAT,
D-FILTER or 15 kHz.
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Low Threshold(dBm) defines the low threshold limits for impulse
noise. Specify a value between -40 and 0.
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Separation(dB) defines the level difference (in dB) between the low,
the mid and high thresholds. Specify a value between 1 and 6 dB.
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Imp. Noise Measure. Time defines the time duration to measure
impulse noise. The available choices are: 1 minute, 5 minutes,
10 minutes, 15 minutes, 60 minutes, or 24 hours.