The Cisco GLC-LH-SM SFP Transceiver Module is a small, hot-swappable optical transceiver designed for Gigabit Ethernet and Fiber Channel applications. It operates on single-mode fiber (SMF) and can transmit data across distances of up to 10 kilometers, making it excellent for extended reach in networking situations. With its dependability, compatibility, and ease of installation, it's an adaptable solution for high-performance optical communication.