?Reliable Assurance?All of our products have gained TUV, UL, CE, FCC, RoHS, REACH, FDA professional certifications; tested by different projects,such as Temperature Cycling,Mechanical Vibration,ESD HBM,EMC,Cyclic Moisture Resistance and Fit&MTBF etc.; and programmed by various brands of the latest and advanced networking switches or other equipments to ensure the reliability. ?SR4 vs SR BiDi?The main difference between 100GBASE-SR4 QSFP28 and 100GBASE-SR BiDi QSFP28 is the transmission and connector type. The 100GBASE-SR4 QSFP28 adopts wavelength 850nm transmission with MTP/MPO connector; while the100GBASE-SR BiDi QSFP28 adopts wavelenghth 850nm&900nm transmission with LC duplex connector. but the Max Cable Distance is as the same as 100m on OM4 / 70m@OM3 on the multimode fiber cable MMF. ?Connectors? The transceiver internally multiplexes an XLPPI 4x25G interface into two 50Gb/s electrical channels, transmitting and receiving each optically over one simplex LC fiber using bi- directional optics. This results in an aggregate bandwidth of 100Gbps into a duplex LC cable. This allows reuse of the installed LC duplex cabling infrastructure for 100GbE application. The optical interface uses a conventional LC duplex connector. ?100GBASE-SR BiDi?100GBASE-SR Bi-Directional QSFP28 Optical Transceiver Module(850nm 100m DOM LC MMF), 100Gbps, 3.5W Power Consumption, MMF 850nm and 900nm, multi mode, maximum link length of 70m/100m/150m on OM3/OM4/OM5 Duplex Multimode Fiber (MMF), LC duplex connector, Hot Pluggable, support DOM and Host FEC. Commercial temperature range 0°C to 70°C(32 to 158°F). ?Wide Compatibility?It's fully compliant and compatible for Mellanox Networks QSFP28 MSA and IEEE 802.3bm 100GBASE-SR Bi-Directional and CAUI-42 standards.