LC end contains Singlemode Fiber Leg. Networx™ 3M Mode Conditioning Duplex Fiber Optic Patch Cable (62.5/125) - LC (equip.) to ST are made for use in Gigabit Ethernet 1000BASE-LX applications When deploying new high-speed 1000BASE-LX routers and switches in existing Multimode backbones, Mode Conditioning Cables are a must. Our Mode Conditioning Fiber Optic Cables allow 1000BASE-LX Ethernet to be run over a Multimode fiber optic backbone by offsetting signal loss. All Mode Conditioning Fiber Optic Cables from the Networx™ are IEEE 802.3z compliant and completely eliminate Differential Mode Delay (DMD).