Exfo FTB-700 for FTB-1 User Manual download pdf (Page 118)

Analyzing Traces and Events

110 FTB-700 Series

Events Tab

For each item listed in the events table, information is displayed:

 Type: Various symbols are used to describe different event types. For a

more detailed description of symbols, see Description of Event Types

on page 293.

 Number: Event number (a sequential number assigned by the OTDR

test application) or, in parentheses, the length of a fiber section (the

distance between two events).

 Loc.: Location; that is, distance between the OTDR and the measured

event or between the event and the beginning of the fiber span.

 Loss: Loss in dB for each event or fiber section (calculated by the

application).

 Refl.: Reflectance measured at each reflective event along the fiber.

 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.

 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 134, Inserting Events on page 138, and Changing the Attenuation

of Fiber Sections on page 144.

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Exfo FTB-700 for FTB-1 User Manual Page 118