Acceptable dB loss for fiber depends on the component you're measuring: a single mated connector pair should lose no more than 0. 75 dB, a fusion splice should stay under 0. 3 dB for mechanical splices; however, this can vary depending on the application, fiber type, and overall network performance requirements. So how do you determine acceptable loss? When testing fibre optic cabling, determining acceptable loss is. 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. The primary contributors to measured splice loss are fiber material and design factors that. The standard for splice loss in optical fiber is typically defined by the International Electrotechnical Commission (IEC) or the Telecommunications Industry Association (TIA).
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