40GBASE-LX4 QSFP+ UNIV MMF/SMF 1271-1331nm 150m/2km DDM Transceiver 100% OEM Compatible 40GBase-LX4 QSFP+ Transceiver (MMF/SMF, 1271-1331 nm, 150 m/2k m, LC, DDM, Commercial Temp.)