Exfo AXS-100 Series OTDR Instrukcja Użytkownika Pobierz pdf (Strona 143)

Description of Event Types

OTDR 135

Echo

This symbol indicates that an echo 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

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 154 155

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Exfo AXS-100 Series OTDR Instrukcja Użytkownika Strona 143