EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 259)

Analyzing Bidirectional Traces
OTDR 245
Viewing and Modifying Current Trace Parameters
Parameters specific to the A->B or B->A trace are also displayed:
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Range: Acquisition range.
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Span ORL: ORL calculated between the span start and the span end,
or can include them, depending on the settings you have chosen in the
setup window.
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High-Resolution Acq.: Indicates whether or not the acquisitions were
performed using the high-resolution feature.
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Helix Factor: Helix factor setting of the displayed trace. If you modify
this parameter, the distance measurements for the trace will be
adjusted.
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IOR: Index of refraction of the displayed trace. If you modify this
parameter, the distance measurements for the trace will be adjusted.
You can enter an IOR value directly or let the application calculate it
with the distance between span start and span end you provide.
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RBS: Rayleigh backscatter coefficient of the displayed trace. If you
modify this parameter, the reflectance and ORL measurements for the
trace will be adjusted.
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Splice Loss Threshold: Splice loss threshold for detecting small
non-reflective events during trace analysis.
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Reflectance Threshold: Reflectance threshold for detecting small
reflective events during trace analysis.
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End-of-Fiber Threshold: End-of-fiber threshold for detecting
important event loss, which could compromise signal transmission,
during trace analysis.