Omada 1000Base-BX Bi-Di SFP. TX:1310nm/RX:1550nm. Single-mode10km. Supports WDM Bi-Directional technology, using a single strand of fiber, cost saving. In pairs with TL-SM321A. Suitable: MC220L, TL-R4199G/4299G, TL-SG3109, TL-SL3428/3452, TL-SG2109WEB/2216WEB/2224WEB, TL-SL2210WEB/2218WEB/2428WEB/2452WEB, TL-SL1351 and the other equivalent devices.