Use the TIA/EIA maximum loss per pair as 0. In practical calculation, the actual connector loss can refer to the value in the fiber optic cable specifications provided by suppliers. For each connector, we usually figure 0. 75 max per EIA/TIA 568) When testing cable plants per OFSTP-14 (double ended). After measuring the loss of a fiber link, you now have to determine if that fiber link loss is acceptable or not. Example Calculator #1: The following formula is used for Calculator #1: This calculator calculates the fiber output power based on the fiber cable loss (dB/Km), length of the cable. Fiber loss can be also called fiber optic attenuation or attenuation loss, which measures the amount of light loss between input and output. Factors causing fiber loss are various, such as intrinsic material absorption, bending, connector loss, etc. Losses in the optical fiber can be categorified. At TREND Networks, we are frequently asked how much loss is allowed when conducting testing on fiber optic cabling. Unfortunately, it is not a simple answer and depends on several factors. So how do you determine acceptable loss? When testing fiber optic cabling, determining acceptable loss is. Use this worksheet to input values for all variables that will impact your system's performance.