TP-LINK (TL-SM321B) 1000Base-BX WDM Bi-Directional SFP ModuleTP-LINK (TL-SM321B) 1000Base-BX WDM Bi-Directional SFP ModuleManufacturer: TP-Link Add to compare listEmail a friend 1000Base-BX WDM Bi-Directional SFP Module Up to 20 km transmission distance with 9/125 μm SMF (Single-Mode Fiber)Bidirectional WDM communication on a single fiberCompatible with Small Form Pluggable Multi-Source Agreement (SFP-MSA)Supports Digital Diagnostic Monitoring (DDM)Hot-swappable module designWork with TL-SM321A as a pair What This Product Does TP-Link´s TL-SM321B adopts the latest standard 1000Base-BX, transmitting over one single-mode fiber with one different wavelength going in each direction. Paired with TL-SM321A, You can extend the network distance up to 20Km with TP-Link´s routers, switches and media converters for reliable high-speed long-distance communication. This product is sold out