Optical Time Domain Reflectometer
An instrument that uses backscattered light to characterize a fiber optic link. Such an instrument allows estimating fiber link attenuation, attenuation coefficient, discrete reflections, splice/connector loss, and point defects, all as a function of fiber distance.
References to OTDR appears in courses:
![SP1000_large](https://wiki.commscopetraining.com/wp-content/uploads/2018/10/SP1000_large-150x150.png)
![SP8850_large](https://wiki.commscopetraining.com/wp-content/uploads/2018/10/SP8850_large-150x150.png)