EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 169)

Analyzing Traces and Events
OTDR 155
Viewing and Modifying Current Trace Settings
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Avg. Splice Loss: Average of all non-reflective events between span
start and span end.
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Max. Splice Loss: Maximum loss of all non-reflective events between
span start and span end.
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Span ORL: ORL calculated either between the span start and the span
end, or on the total fiber span, depending on the option you have
selected in the Setup window.
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High-Resolution Acq.: High-resolution feature was selected to
perform the acquisition. For more information, see Enabling the
High-Resolution Feature on page 74.
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Helix Factor: Helix for the displayed trace. If you modify this
parameter, the trace distance measurements will be adjusted.
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IOR: Refraction index of the displayed trace, also known as group
index. 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. The IOR value is displayed with six digits after the
decimal point.
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RBS: Rayleigh backscatter coefficient setting 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: Current setting for detecting small
non-reflective events during trace analysis.
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Reflectance Threshold: Current setting for detecting small reflective
events during trace analysis.
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End-of-Fiber Threshold: Current setting for detecting important event
loss that could compromise signal transmission during trace analysis.