Optical Time-Domain Reflectometers (OTDRs). What You Need to Know.

OTDR’s (Optical Time-Domain Reflectometers) fundamentally do two things: They measure loss on a vertical scale, and they measure distance on a horizontal scale. There are also two types of event classifications that the vast majority uses when discussing events on the replicated signature trace upon completion of a test, or when reviewing a trace in real time: Non-Reflective and Reflective events.