The StarTech GLCLHSMDST is a Cisco GLC-LH-SMD compatible 1000BASE-LX/LH SFP module that delivers 1Gbps Ethernet over single-mode fiber at distances up to 10km. Designed with LC connectors, 1310nm wavelength, and Digital Diagnostics Monitoring (DDM), it ensures reliable long-distance data transmission with full performance visibility. Ideal for Cisco Firepower, ASR920, IE2000, and more, this hot-swappable transceiver is Plug and Play, making it easy to integrate into existing fiber networks.