What type of cable is characterized by a high fiber count in a small diameter and is used for long distances?

The appropriate choice is ribbon cable, which is designed to hold a high fiber count in a compact form factor. This type of cable is especially useful in environments where space is limited, and the need for high capacity over long distances is essential. Ribbon cables organize fibers in flat ribbons that allow for a higher density of fibers compared to traditional round cables. This design not only saves space but also simplifies mass fusion splicing processes during installation and maintenance, making it an economical and efficient option for long-haul applications.

In contrast, simplex cables are typically used for individual connections and do not feature the same fiber density or long-distance capability. Breakout cables, while they provide a means to separate multiple fiber strands into individual components, are usually bulkier and not as efficient for high counts as ribbon cables. Patch cords serve as short-duration connections and are not suited for long-distance runs or high fiber counts, as their purpose is mainly for interconnecting devices within a more localized setting.