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The 100G QSFP28 SR4 is designed for use in 100-Gigabit Ethernet links up to 100m over Multi-Mode Fiber (MMF), particularly for liquid immersion environments. It is compliant with the QSFP28 MSA and IEEE 802.3bm 100GBASE-SR4 and CAUI-4 standards. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA. The module integrates 4 data lanes in each direction with 4x25.78125Gb/s bandwidth and uses a 38-contact edge type electrical connector. The optical interface features a single male MPO-12 pigtail. This module incorporates proven circuit and VCSEL technology to deliver reliable long-term performance and consistent service. As data traffic and heat flux from datacenter chips continue to grow, traditional air-cooling methods are under pressure. Liquid cooling technologies can remove heat more efficiently using dielectric fluids with high heat capacity, improving energy efficiency in datacenters. However, the lack of optical transceivers that can reliably operate even when fully immersed in liquids up to 10m deep has been a challenge. Montclair's Liquid Cooling Optical Series transceivers are designed specifically for liquid-cooled server environments and are compatible with fluorinated liquids and mineral oils.