Diagnosing NEXT Failures with the OMNIScanner | Fluke Networks

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Diagnosing NEXT Failures with the OMNIScanner

The last OMNIScanner left the factory back in July 2005. We regret to say service and support ended July 2009. It's replaced by the Versiv familly of testers.
The OMNIScanner line of cable testers includes a diagnostic feature called S-Bands. The S-Bands will indicate the point of failure in the link under test.

To begin, turn the OMNIScanner on and connect to the link to test. Press the Autotest button to run the test. When the Autotest is complete, if there is a NEXT failure, this is what the screen will look like. Highlight NEXT and press Enter to view the pair data.

Highlighted NEXT Failure in OMNIScanner

This shows which pair or pairs are failing and the data that was used to determine the failure.

NEXT Pairs Failure Determination

Highlight the pair that you want to diagnose by scrolling with the arrow pad to that pair. You can view Graph by pressing the Graph button Graph button in OMNIScanner.

NEXT Pair Failure Graph

To determine the location of the failure, you need to use the S-Bands Diagnostics.

NEXT Pairs Failure Determination

In this occurrence, the 36/45 pair is selected. Press the Diagnostics button Diagnostics button in OMNIScannerto begin the S-Bands Diagnostics cycle.
The OMNIScanner will begin the S-Bands Diagnostics on the selected pair.

S Bands Diagnostics Progress

When the OMNIScanner completes the diagnostics, the following screen appears:

S Bands Failure in Connection Graph S Bands Failure in Mated Connection Graph

                                                           NEXT at 6.5 feet                                                           NEXT at 20.3 feet
You can see that the spikes exceed the S-Bands on the left side of the screen. You can also see that the failure is occurring at 6.5 feet as indicated in the upper right of the screen and the vertical line. The vertical line is a movable cursor that can be moved using the arrow pad. This graph indicates that the failure is in the connection. There are also sources of NEXT in the cable as shown by moving the cursor and seeing that the next largest source of NEXT is at 20.3 feet.

  • The spike that exceeds the S-Bands indicates that the failure is occurring in the mated connection.
  • The mated connection consists of the jack, plug and wiring termination.
  • This is a connection being tested from the OMNIScanner end of the Link.
  • Time for Mr. X to re-terminate this panel!
  • If the spikes are within the S-Bands, the NEXT failure is not in the connection.

NEXT Cable Failure Graph

This graph indicates that the NEXT failure is in the cable and is occurring at 25.2 feet from the OMNIScanner. This means that the worst NEXT is occurring at 25.2 feet from the head of the scanner.
You can change your view from the OMNIScanner to the OMNIRemote ends by using the Switch To Remote Switch To Remote Button in OMNIScanner and Switch To Scanner Switch To Scanner Button in OMNIScanner buttons.

NEXT Pairs Failure Determination Highlighted NEXT Failure in OMNIRemote

This allows you to run the S-Bands Diagnostics from either end of the link being tested.

Author: Adrian Young

Creation Date: 2014-02-27

Last Modified: 2014-02-27

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