Used individually or in pairs, this media converter can extend Gigabit Ethernet over single mode fiber up to 125 km. Convert 1000BASE-SX ports on a Gigabit Ethernet switch to 1000BASE-LX on a port-by-port basis. Ideal for campus area networks or other applications requiring the distance advantages of single mode fiber. Extend a Gigabit Ethernet backbone connection up to 125 km for MAN (metropolitan area network) applications. Save money by purchasing Gigabit Ethernet devices with lower cost multimode fiber interfaces and use converters to introduce single mode fiber only where you need it.