Indoor pigtails: The most common type. Lightweight, flexible, no extra protective layer. Designed for protected environments like splice trays inside ODF panels, fiber terminal boxes, and distribution frames. Without pigtails, every termination in an ODF, terminal box, or splice closure would require field-installed connectors—an approach that is both time-consuming and less reliable. For procurement managers and engineers, understanding fiber pigtails is not only about knowing another product type, but. A fiber optic pigtail is a short optical fiber cable that has a connector on one end and an exposed (unterminated) fiber on the other. This creates a stable and reliable connection between network equipment.