What is the maximum length for singlemode fiber optic cable for backbones as per structured cabling standards?

The maximum length for singlemode fiber optic cable used in backbone applications, according to structured cabling standards, is indeed 3000 meters. This value is specified in industry standards to ensure that the optical signals can be transmitted effectively without significant loss or degradation over extended distances.

Singlemode fiber is designed for long-distance data transmission and has a much smaller core diameter than multimode fiber, allowing it to carry signals over greater distances with minimal attenuation and dispersion. The 3000 meters specification aligns with the operational requirements for backbone installations, where long-distance connectivity is essential, such as between buildings on a campus or within a large enterprise network.

In contexts where shorter distances are necessary, different standards or types of cabling might apply, but for backbone infrastructure specifically, adhering to the 3000 meters limit ensures compliance with the quality and performance expected in modern structured cabling systems.