Fiber optic cable loss per kilometer acceptable standard
Multimode fiber loses more, typically around 3 dB per kilometer at 850 nm and 1 dB per kilometer at 1300 nm. This depends on various factors, including who is conducting the test and the phase of the project. Acceptable dB loss for fiber depends on the component you're measuring: a single mated connector pair should lose no more than 0. According to the TIA/EIA-568 standard, different fiber types have different maximum attenuation limits (see the chart below.
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