EXFO FTV-700 series, Руководство пользователя

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Analyzing Traces and Events
108
FTB-700 Series
Events Tab
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Loc. : Location; that is, distance between the OTDR and the measured
event or between the event and the beginning of the fiber span.
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Loss : Loss in dB for each event or fiber section (calculated by the
application).
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Refl. : Reflectance measured at each reflective event along the fiber.
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Att.
: Attenuation (loss/distance) measured for each fiber section.
Note: The attenuation value is always presented in dB per kilometers even if the
distance units you selected are not the kilometers. This follows the
standards of the fiber-optic industry that provides the attenuation values in
dB per kilometers.
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Cumul. : Cumulative loss from the trace span start to span end; the
running total is provided at the end of each event and fiber section.
Cumulative loss is calculated for the events displayed in the events
table, excluding those that are hidden. For a more accurate link loss
value, refer to the loss measurement displayed in the
Trace Info. tab.
If you want to modify events or fiber sections, see
Modifying Events
on
page 132, Inserting Events on page 136, and Changing the Attenuation
of Fiber Sections
on page 142.