EXFO VDSL2 - Manual (Page 114)

Wideband Tests
106 AXS-200/635
PSD Noise
PSD Noise
The wideband power spectral density (PSD) noise test measures the noise
energy at a point in a noise spectrum. It is expressed as power per hertz at
a point in a noise spectrum.
Test Setup
The Test Setup tab allows you to configure the parameters for the
wideband PSD noise test.
Each parameter on the pane is
described below.
³
Bandwidth specifies the frequency
range for the test. Select 2.2 MHz,
12 MHz, 17 MHz, or 30 MHz.
Note: Frequency bands in excess of 2.2 MHz
are only displayed if VDSL2WB is
enabled in the software options.
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, 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.