When selecting a 2 core fiber optic cable for data transmission, surveillance, or telecom applications, prioritize single-mode vs. multimode type, jacket material (e., LSZH or armored), connector compatibility (like SC, LC, or ST), and minimum bend radius. They provide light-speed transmission, low latency, and future-ready bandwidth — advantages that copper cables cannot match. For most long-distance, high-bandwidth. Executive Summary: Fiber optic cable selection is not one decision — it is a chain of six interdependent choices: single-mode or multimode, which OM/OS grade, tight-buffer or loose-tube construction, which jacket rating, which connector type, and whether to armor. Single-mode fiber (SMF) features an extremely thin core layer measuring 8-9µm in diameter. This small-diameter core can carry only one light. Multimode Multimode fiber optic cable has a large-diameter core that is much larger than the wavelength of light transmitted, and therefore has multiple pathways of light-several wavelengths of light are used in the fiber core. Multimode fiber optic cable can be used for most general fiber. In practice, the choice is usually simple: use OS2 whenever you are crossing car parks or open ground, and use OM3/OM4 where both ends sit inside the same building or in adjacent buildings within a few hundred metres. Many SMBs standardise on OS2 for all new outside plant and on OM4 for new data.