User Manual

VF / DSL Cable Qualifier

The Rx unit will calibrate itself first and then try to synchronize with Tx unit. Once both units are

synchronized, the test will be carried out. The whole process is automatic. When a test is completed, the

CableSHARK’s large graphical display will show the results of the DMT test. The user can then move the

cursor to get all the information presented both graphically and numerically. The Rx unit can initiate another

End-To-End test again and again since the Tx unit is set to Remote Responder mode. To repeat the test,

press the RUN/STOP button. You can also change option settings if you wish by pressing the function button

associated with TEST SETUP.

7.5 Noise Tests

Note: This is a Single-Ended test.

The CableSHARK noise test performs Noise PSD (Power Spectral Density), Impulse Noise and Impulse

Histogram Measurements.

1. From the Main Menu, select CABLE TESTS (function button F1).

2. Choose NOISE from the pop-up menu.

3. Select Noise PSD Next/Fext or the Impulse Noise Test or the Impulse Histogram Test and set the other

parameters if required. Parameters for the Impulse Noise test include Impulse Noise Threshold and

Impulse Noise Measurement Time which allows the user to configure the Impulse Noise test to meet

their requirements, for the Impulse Histogram, parameters include Impulse Noise Threshold, Plot

Interval and Impulse Noise Measurement Time.

4. Press the RUN / STOP button to start the test. The results will be displayed on screen in an easy to

understand format.

To repeat the test, press the RUN/STOP button.

7.6 Longitudinal Balance Test

Note: This is a Single-Ended test.

Longitudinal balance ratio is defined in ITU-T Rec. O.9, which is important when it comes to reducing the

effects of common-mode voltage to ground. The CableSHARK can perform a longitudinal balance

measurement to determine if the longitudinal balance ratios are compliant with a standard. The

CableSHARK displays results for ADSL applications respective of the ANSI T1.413 standard. The test

results can also be used for ISDN and HDSL applications. The better the balance of the cable pair under

test, the higher the dB reading resulting from the measurement.