Tripp Lite's 15-meter ( 50ft ), singlemode duplex fiber optic SC/ST patch cable is manufactured from 9/125 zipcord fiber. The cable has ST connectors on one end, SC on the other, a PVC jacket, and is FDDI and OFNR rated. Duplex singlemode fiber is most commonly used in LAN applications. Manufactured from 9/125 duplex (zipcord) fiber PVC jacket Length: 15-meter ( 50ft ) Connectors: 2 ST and 2 SC connectors on each end Insertion loss testing performed on every connector (0.2db typical) and provided with cable Beveled edge on ends of glass makes insertion of plug a breeze Fiber made from glass (not a polymer) Fiber optic distributed data interface (FDDI) rated OFNR (riser rated)