Software Owner manual

Description of OTDR Event Types

Data Post-Processing Software 209

Non-Reflective Event

This event is characterized by a sudden decrease in the Rayleigh

backscatter signal level. It appears as a discontinuity in the downward

slope of the trace signal.

³ This event is often caused by splices, macrobends, or microbends in

the fiber.

³ A loss value is specified for non-reflective events. There is no

reflectance specified for this type of event.

³ If you set thresholds, the application indicates a non-reflective fault in

the events table, whenever a value exceeds the loss threshold.

Reflected power

(dB)

Distance

(km)

Non-reflective

event

Linear downward slope

due to Rayleigh

backscatter