TP-Link SM321B Bi-Directional WDM SFP is a module designed for 1000BASE-BX Gigabit connections over single-mode fiber, ensuring reliable transmissions up to 20 km at speeds of 1.25 Gbps. Equipped with a simplex LC interface, it uses a Tx 1310 nm / Rx 1550 nm wavelength, ensuring compatibility with the SFP-MSA standard and IEEE 802.3z protocols. It integrates the DDM (Digital Diagnostic Monitoring) function for real-time monitoring of optical power, temperature and current, improving network management. The Hot-Pluggable design allows installation and replacement without service interruption, making it ideal for switches, routers and corporate servers. FCC and CE certified, it represents a safe and professional solution for modern LAN and WAN networks . Omada Technical Data Sheet