The ST/UPC Fiber Pigtail SM OS2 900µm 1m Yellow (Part number: 101000500100009) is a Fiber Pigtails with a ST /UPC connector. Fiber optic pigtail is a type of cable that is made of a connector at one end, and loose wires on the other. The pigtail connector side is used to link the equipment, while the pigtail side made of loose wires that are melted in order to be connected to the fiber cable. Pigtails can be single-mode or multi-mode, which can be accompanied by terminations like SC, FC, ST, LC, MU, MT-RJ, and others. It is normally used within the wall or rack mounted patch panel.