40G QSFP ER4 optical transceiver module, support 40Gb/s and up to 40 km transmission on SM fiber, it works in high-speed IDC connection solutions, and so on. Features 4 CWDM lanes MUX/DEMUX design Up to 11. 3ba 40GBASE-SR4 Ethernet transmission protocol and offer optional dual-rate versions supporting 40GE/OTU3. These modules utilize 4. NS's family of 40 Gbps QSFP Modules, including the QSFP-40G-SR, QSFP-40G-LR, QSFP-40G-ER, and QSFP-40G-ZR4, offers true multi-vendor interoperability, digital diagnostics, and hot-plug convenience. WolonFiber manufactures strictly MSA-compliant 40G QSFP+, 50G SFP56, and 50G QSFP28 optical interconnects optimized for mission-critical telecommunications.