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Running a WB Longitudinal Balance Test
To run a WB Longitudinal Balance test, do the following:
1.
From the XDSL Toolbox, select
The WB Long. Balance connection diagram is displayed.
2.
Follow the on-screen instructions to connect the
CopperPro or TN2100 "Terminator") and
CopperPro) to both ends of the test pair.
The Receiving Unit's Ground lead must be disconnected for this test.
3.
If the "Sending Unit" is another CopperPro, set it up as the WB Long.
Balance
Sending Unit
is a Terminator, just turn it on.
4.
Select
Receiving Unit
The receiving tester commands the far-end device to apply a longitudinal
disturbing signal having a known, preset level on the pair. It then measures the
resulting T-R signal (at the applied frequency) caused by pair imbalance to
Ground. The WB Longitudinal Balance of the pair is the level of the disturbing
signal (in dBm) minus the level of the measured T-R signal (in dBm).
WB Longitudinal Balance Test Results
Test results are displayed on the receiving tester, as shown in Figure 5-13, in
the upper right corner of the screen. Failing values are highlighted in flashing
reverse-video format. This test was run with a disturbing frequency of 196 kHz
and the "F" filter (as indicated) to qualify the pair for HDSL service.
5.
Press A(
Contin WB Long. Bal.
XDSL Testing and Loop Qualification
WB Long. Balance
Note
, and press K on its keypad. If the "Sending Unit"
for the measuring CopperPro, and press K.
) to view balance results in real-time.
The XDSL Toolbox
and press L.
Sending Unit
(measuring
Receiving Unit
5
(another
5-25
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