The Mellanox SFP28-25G-BX Compatible, 25GBASE-BX10-U SFP28 1270nm-TX/1330nm-RX 10km Optical Transceiver Module provides up to 20 km of 25GBase-BX throughput over single-mode fiber (SMF) using 1270nm-TX/1330nm-RX wavelengths via LC simplex connectors. This bi-directional unit must be used with another transceiver or network equipment of complementary wavelengths. It provides 25GBASE Ethernet connectivity options for 25G Ethernet, telecom and data centers. It is fully compliant with SFF-8472, SFF-8402, SFF-8432, SFF-8431, MSA and eCPRI standards.