The CISCO GLC-LH-SMD-WS is part of the Cisco Excess program, wherein previously used or surplus transceiver modules are reconditioned, tested, and resold under warranty. It supports 1000BASE-LX/LH Ethernet links over a 1310 nm wavelength and can transmit data over single-mode fibers for distances up to 10 kilometers and multimode fibers up to 550 meters. Equipped with Digital Optical Monitoring (DOM) for real-time parameter tracking and an LC connector, this module is ideal for organizations looking for an environmentally friendly and cost-effective way to expand their network infrastructure. Despite being pre-owned or surplus, these modules are certified to meet Cisco's stringent quality standards, ensuring reliable performance.