Cisco Systems, Inc. GLC-LH-SM SFP Transceiver

The Cisco GLC-LH-SM SFP Transceiver is a 1 Gbps, single-mode fiber optical module that enables long-distance Gigabit Ethernet across Cisco networks. It operates at 1310 nm and supports up to 10 km over single-mode fiber, with a duplex LC connector, Mini-GBIC/SFP interface, and a hot-swappable SFP form factor. It complies with IEEE 802.3z (1000BASE-LX/LH) and is compatible with Cisco switches and routers that include SFP ports. Designed for enterprise, campus, and data center networks, it serves as switch-to-switch uplinks, backbone links between buildings, and extended fiber connectivity across core, distribution, and access layers, helping scale fiber architectures without repeaters. Common replacements include GLC-LH-SMD, GLC-SX-MMD, and GLC-ZX-SM, and Alternate Part Number GLCLHSM.