The CISCO GLC-LH-SMD extends the capabilities of the standard GLC-LH-SM by including Digital Optical Monitoring (DOM) functionality. This feature allows for real-time monitoring of the transceiver's operating parameters such as temperature, optical power levels, and laser bias current, offering a higher degree of operational safety and stability. It supports 1000BASE-LX/LH Ethernet standards and operates over a 1310 nm wavelength. The module is designed to facilitate transmissions over both multimode and single-mode fibers, achieving distances up to 10 kilometers on SMF and 550 meters on MMF. With an LC connector and hot-swappable capability, it ensures a reliable, high-performance connection in enterprise networks and data centers while allowing easy maintenance and upgrades.