Connect industrial Ethernet equipment to a multimode fiber run with 1000BASE-SX optical signaling at 1 Gbps. The TP-Link Omada ISM311LM installs in a compatible SFP slot and presents a duplex LC optical interface, allowing a switch uplink or inter-cabinet connection to move from copper Ethernet to fiber without a separate media converter. The module uses 850 nm multimode optics and supports fiber links up to 550 m when used with suitable multimode cabling. Its duplex LC interface uses one fiber for transmit and one for receive, making it suited to structured-fiber links between control cabinets, network closets, production areas, and other locations where electrical isolation or distance makes copper impractical. Industrial temperature operation from -40 °C to 85 °C distinguishes this module from standard office-environment optics. Use it in equipment with a 1 Gbps SFP interface that supports 1000BASE-SX multimode transceivers. It provides an optical Ethernet uplink for Omada industrial switching deployments while retaining the compact, field-replaceable SFP form factor.