TP-Link TL-SM311LS ndash; Singlemode 1Gb/s MiniGBIC Module Developed in accordance with the Small Form Pluggable Multi-Source Agreement (SFP-MSA), TL-SM321B-2 uses an integrated LC Bi-Directional optical interface connector, and the data link is up to 2 km for 9/125 μm SMF (Single-Mode Fiber) TP-Link SFP Module Single-mode Tp-link SM321A 1000Base BX WDM Bi Directional SFP Module Installation Guide Bi-directional SFP Transceiver 10GBase-LR SFP+ LC Transceiver 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 TP-Link's TL-SM321B-2 is used for short-and medium distance fiber network in practice, and it provides fast and stable gigabit fiber connection for switches... Wavelength: Tx 1310nm, Rx 1550nm., Data Rate: 1., 25Gbps. Single-mode SFP Module, WDM Bi-Directional communication on a single fiber