The GLC-LH-SMD is a Cisco 1000BASE-LX/LH SFP transceiver module designed for reliable Gigabit Ethernet fiber connectivity. Built for long-distance network links, it supports up to 10 km over single-mode fiber and up to 550 m over multimode fiber, making it a strong choice for enterprise switches, campus networks, data centers, and building-to-building connections. With LC duplex connectivity, 1310 nm wavelength, and Digital Optical Monitoring support, the GLC-LH-SMD helps deliver stable performance while allowing network teams to monitor optical signal strength, temperature, and module health. It is ideal for businesses that need dependable 1G fiber uplinks with trusted Cisco compatibility.