Exfo FastReporter Data Post-Processing Software Manual do Utilizador descarregar pdf (Página 222)

Description of OTDR Event Types

216 FastReporter

Echo

This symbol indicates that a reflective event has been detected after the

end of the fiber.

³ In the example above, the launched pulse travels up to the end

connector and is reflected back toward the OTDR. Then, it reaches the

second connector and is reflected again toward the end connector. It is

then reflected back to the OTDR.

³ The application interprets this new reflection as an echo because of its

characteristics (reflectance and particular position with respect to

other reflections).

³ The distance between the second connector reflection and the end

connector reflection is equal to the distance between the end

connector reflection and the echo.

³ There is no loss specified for echo events.

Reflected power

(dB)

Distance

(km)

OTDR connector

Second connector

End connector

Echo

Lightwave travel

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Exfo FastReporter Data Post-Processing Software Manual do Utilizador Página 222