Complete your high-speed, long-distance fiber installation with the TP-Link TL-SM321B V3 1000Base-BX WDM Bidirectional SFP Module, which pairs with a TL-SM321A V3 to deliver up to 1.25 Gb/s full-duplex speeds over one Single-Mode fiber connection between your switches, storage devices, and servers. This SFP module features an integrated LC bidirectional optical interface with 1310nm transmission and 1550nm reception wavelengths that supports data links up to 12.4 miles in 9/125µm Single-Mode fiber. The TL-SM321B V3 also includes a Digital Diagnostic Monitoring (DDM) feature that provides real-time monitoring, showing parameters such as the transceiver's current for transmitting and receiving optical power, and the operating temperature.