Tripp Lite's 5-meter ( 15ft ), singlemode duplex fiber optic ST/ST patch cable is manufactured from 8.3/125 zipcord fiber. The cable has ST connectors on each end, a PVC jacket and is FDDI and OFNR rated. Duplex singlemode fiber is most commonly used in LAN applications. Tripp Lite warrants this product to be free from defects in materials and workmanship for life.