Here is your practical guide to understanding what the trace viewer is actually telling you. When you look at an OTDR trace viewer, you are looking at a graph. The X-axis represents distance (length of the fiber). The Y-axis represents signal loss (dB).

Don't just save the trace; it. Once you understand the language of the slope, you won't just find faults—you will predict them before they cause an outage.

Have a trace that stumped you? Drop a screenshot in the comments (hide the customer name!) and let’s diagnose it together.

The OTDR trace viewer is not a simple "pass/fail" screen. It is a geological map of your fiber link. Learning to interpret the bumps, dips, and spikes is what separates a cable puller from a network diagnostician.