Software Owner manual

Description of OTDR Event Types

Data Post-Processing Software 211

Launch Level

This event indicates the level of the signal launched into the fiber.

³ The figure above shows how the launch level is measured.

A straight line is plotted using least-square approximation to fit all trace

points in the linear area between the first and second detected events.

The straight line is projected toward the Y (dB) axis until it crosses the

axis.

The crossing point indicates the launch level.

³ <<<< in the events table indicates that the launch level is too low.

Reflected power

(dB)

Distance

(km)

Launch level

event position

Second event

Launch

level

Linear area