Based on a central buffer tube, the cable construction is compact, light, flexible and ideal for connections requiring a moderate fiber count. Belden's Central Loose Tube Fiber Cables support indoor/outdoor use—including conduit, direct burial, aerial and trunking. Built with 250 µm fibers (2–24 count), they're offered in plenum, riser, indoor/outdoor-LSZH and outside plant (OSP) ratings. Armor options include all-dielectric, aluminum. Commonly used outdoor optical cables are divided into two structures: central bundle tube type and layer stranded optical cable: ① Central tube optical cable: The center of the optical cable is a loose tube, and the strengthening member is located around the loose tube. To meet indoor safety requirements, the cable shall use materi ls that comply with IEC standards for low smoke. Outdoor self-supporting optical cable for communication in an "8" shape configuration, featuring a metal reinforcing messenger wire, central tube filling, and a polyethylene bonded sheath.
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