Exfo OTDR 2 Manual de usuario descargar pdf (Pagina 209)

Description of Event Types

OTDR 201

Reflective Event (Possible Echo)

This symbol indicates a reflective event that can be a real reflection or an

echo produced by another stronger reflection located closer to the source.

 In the example above, the launched pulse hits the third connector, is

reflected back to the OTDR and reflected again into the fiber. It then

reaches the third connector a second time and is reflected once more

to the OTDR.

The application would therefore detect a reflective event located at

twice the distance of the third connector. Since this event is almost null

(no loss), and since its distance is a multiple of the third connector

distance, the application would interpret it as a possible echo.

 A reflectance value is specified for reflective events (possible echo).

Reflected power

(dB)

Distance

(km)

OTDR connector

Second connector

Third connector

Reflective event (possible echo)

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Exfo OTDR 2 Manual de usuario Pagina 209