EXFO VDSL2 - Manual (Page 123)

Wideband Tests
Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set 115
Impulse Noise Histogram
Impulse Noise Histogram
The wideband impulse noise histogram test displays a plot of the impulse
noise spikes over a user-defined time period.
Test Setup
The Test Setup tab allows you to configure parameters for the wideband
impulse noise histogram test.
Each parameter on the pane is
described below.
³
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
Termination Impedance defines the impedance of the dummy load
connected to the line. Select either 100 or 135 Ohm.
³
Noise Filter defines the level of wideband noise filtering. The available
choices are: NONE, 15 kHz, 50 kbit, ISDN-E, HDSL-F, ADSL-G, ADSL,
ADSL2+, VDSL, VDSL2-8, VDSL2-12, VDSL2-17, or VDSL2-30.
Note: VDSL2-x filters are only available if VDSL2WB is enabled in the software
options.
³
Threshold(dBm) is the maximum impulse noise level. Specify a value
between -50 and 0 (-40 and 0 if any filter applied).