This guide provides a detailed roadmap for locating and fixing fiber optic cable breaks, covering detection techniques, repair methods, and best practices. Calculating a loss budget for a cable plant involves estimating all the component losses - fiber, splices and connectors - and summing them up. Go here for more comprehensive discussion on how to calculate a loss budget. For each connector, we usually figure 0. Fiber optics is immune to electromagnetic interference. Attenuation Coefficient (dB/km): This value represents the inherent signal loss per kilometer of.