What is a fault locator used to locate within a fiber optic network?

• A. Break
• B. Junction
• C. Splice
• D. Connector

Answer: (A)

Locating a break in the fiber is what a fault locator is designed to do. It sends a test signal into the fiber and looks for where light propagation is interrupted, or for reflections that reveal where the fiber has opened. That point of interruption is the fault you need to repair, which is why a fault locator targets a break. Junctions, splices, and connectors are normal joining points in the network; they aren’t the fault the tool is meant to pinpoint, though they can contribute to loss or reflections if misaligned or damaged.