For OS2 outside plant, what is the maximum attenuation of singlemode optical fiber cable at 1550 nm?

The maximum attenuation for singlemode optical fiber at 1550 nm is typically recognized as 0.4 dB/km. This figure reflects the industry standard for the performance of singlemode fibers, which are designed to handle long-distance transmission with lower signal degradation compared to multimode fibers. The specific wavelength of 1550 nm is chosen because it is where the attenuation characteristics of the optical fiber are optimized, resulting in minimal loss.

Understanding this attenuation limit is essential for network designers and installers, as it directly impacts the overall performance and reliability of the fiber optic network over distance. When planning installations or troubleshooting existing networks, keeping the maximum allowable attenuation in mind helps ensure that signal strength remains robust over the designed coverage areas.

In contrast, the other values presented as potential answers either exceed the established standard or fall outside typical usage parameters for singlemode fibers at 1550 nm. This helps reinforce the significance of 0.4 dB/km as the maximum acceptable attenuation for optimal system performance.