Startech SFPGLCSXMMST Cisco Compatible Gigabit Fiber, Standards IEEE 802.3z 1000BASE-SX, Data Transfer Rate 1.25 Gbps, Distance 550 m (1804 ft), Wavelength 850nm, Networks 1000 Mbps (1 Gbps), MTBF 3,381,761 hours, Included 1 - 1.25 Gbps Multimode LC SFP. The SFPGLCSXMMST is a Cisco GLC-SX-MM compatible fiber transceiver module that has been designed, programmed and tested to work with Cisco® brand switches and routers.