1000Base-LX SFP Cisco is a type of fiber optic transceiver module used in Gigabit Ethernet networks. It is designed to support data rates of up to 1 Gbps over a single strand of fiber optic cable. It is compatible with Cisco switches and routers and is used to connect two devices over a long distance. It is also backward compatible with existing 1000Base-SX networks. The module is hot-swappable, allowing for easy installation and maintenance. It is also energy efficient, helping to reduce power consumption.