Single-mode SFP Module, WDM Bi-Directional communication on a single fiber Work with TL-SM321A as a pair and create a full-duplex gigabit path between your switches, storage devices, and server Wavelength: Tx 1310nm, Rx 1550nm. Data Rate: 1.25Gbps. Port Type: LC Simplex. Always keep the protective dust plug on the SFP's optical bores until you are ready to make a connection Compatible with all SFP ports on TP-Link product including JetStream switches, and media converter MC220L Developed in accordance with the Small Form Pluggable Multi-Source Agreement (SFP-MSA), TL-SM321B uses an integrated LC Bi-Directional optical interface connector, and the data link is up to 20 km for 9/125 µm SMF (Single-Mode Fiber) TL-SM321B incorporates the Digital Diagnostic Monitoring feature which is compatible with SFF-8472. DDM supports real-time monitoring of the transceiver and shows parameters including the transceiver current which transmits/receives optical power and operating temperature.