Determine cable loss, connector loss, and total system loss in decibels (dB) to assess signal quality and repeater requirements. Fiber optic loss is calculated in two parts: cable loss and connector loss. Cable loss (dB) = cable length (km) × attenuation coefficient (dB/km). Losses can be divided into intrinsic and. Losses in the optical fiber can be categorified into intrinsic optical fiber losses and extrinsic optical fiber loss depending on whether the loss is caused by intrinsic fiber characteristics or operating conditions. Lead-in fibers are useful to locate short distance faults and making loss/attenuation. Guidelines On What Loss To Expect When Testing Fiber Optic Cables To be able to judge whether a fiber optic cable plant is good, one does a insertion loss test with a light source and power meter and compares that to an estimate of what is a reasonable loss for that cable plant.
