The ST/UPC 12 Fibers Color-coded Pigtail SM G652D 900µm 2m (Part number: 101000500200005) 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.
The ST FO Connector is a type of fiber optic connector that uses a 2.5mm ceramic ferrule to align and connect optical fibers. Used in high-speed data communication networks. Provides low insertion loss and high return loss. It features a bayonet-style twist lock and is commonly used in single-mode or mult-imode fiber optic applications. The connector is highly reliable and durable. It is almost obsolette, is not used in new aplications.
UPC (Ultra Phisical Contact), is a type of polishing procedure that makes a connical end face ferrule minimizing the interference of dust particules in the connectors mate. It as a Return loss >-50dB. UPC connectors may only be mated with other UPC or PC connectors. It can be identified by the blue boot and is used in single-mode and multi-mode fibers.