Exfo FTB-7000 OTDR Series for FTB-500 Manual de usuario descargar pdf (Pagina 257)

100

101

Analyzing Bidirectional Traces

OTDR 243

Viewing and Modifying Current Trace Parameters

Viewing and Modifying Current Trace

Parameters

You can view the current trace parameters for the bidirectional trace as

well as for the A -> B and B -> A traces. However, you can only modify the

analysis settings for the current A->B and B->A traces, not for the

bidirectional trace.

Two groups of parameters can be changed:

³ the fiber settings: index of refraction (IOR), Rayleigh backscatter (RBS)

coefficient, and Helix factor

³ the analysis detection thresholds: for splice loss, reflectance, and

end-of-fiber detection

These modifications alter the displayed traces. These settings will also be

used when you reanalyze the trace.

By default, a tolerance interval parameter is used during bidirectional

analysis to match events from A->B and B->A traces in the resulting

bidirectional trace.

When you know the exact location of events in traces acquired in both

directions and are expecting a perfect match, you could get pairs of closely

spaced events in a combined trace. This is due to a difference in the

measured distance of events in each direction, which is greater than the

default tolerance interval.

You can increase the tolerance interval value in order to eliminate

mismatched events on the bidirectional trace.

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Exfo FTB-7000 OTDR Series for FTB-500 Manual de usuario Pagina 257

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