The TP-Link TL-FM321 is a reliable Gigabit SFP transceiver module designed for 1000Base-SX multi-mode fiber connections, supporting transmission distances up to 550m (50/125μm fiber) or 220m (62.5/125μm fiber). It features a standard LC/UPC interface and ensures easy installation with Plug & Play functionality—no configuration required. Compatible with a wide range of TP-Link switches and routers, it’s ideal for stable, high-speed fiber optic networking in enterprise or campus environments.