Exfo VDSL2 User Manual download pdf (Page 38)

Auto CQ/Video-DSL Rate Prediction

30 AXS-200/635

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:

³ VF Noise Filter defines the level of

voice frequency noise filtering. If

the ANSI standard is used, the

available choices are: NONE,

C-MESSAGE, CNOTCHED,

3kHzFLAT, D-FILTER or 15 kHz. If the ITU standard is used, the

available choices are: NONE, PSOPHOMETRIC, P-NOTCHED,

3kHzFLAT, D-FILTER or 15 kHz.

³ 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.

³ Imp. Noise Filter defines the type of impulse noise filtering to use. If

ANSI standard is used, the available choices are: NONE, C-MESSAGE,

CNOTCHED, 3kHzFLAT, D-FILTER or 15 kHz. For the ITU standard,

the choices are: NONE, PSOPHOMETRIC, P-NOTCHED, 3kHzFLAT,

D-FILTER or 15 kHz.

³ Low Threshold(dBm) defines the low threshold limits for impulse

noise. Specify a value between -40 and 0.

³ Separation(dB) defines the level difference (in dB) between the low,

the mid and high thresholds. Specify a value between 1 and 6 dB.

³ 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.

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Exfo VDSL2 User Manual Page 38