Carry 100 Gigabit Ethernet traffic across single-mode fiber with LR4 optics built for links up to 10 km. The HPE Aruba Networking S6H32A uses the QSFP28 pluggable form factor and an LC optical connection, providing a direct optical-interface option for compatible equipment with a 100G QSFP28 port. Its LR4 designation identifies it as a long-reach single-mode fiber optic rather than a short-reach multimode module. The LC interface suits duplex single-mode fiber runs commonly used between network rooms, distribution areas and separated buildings. A 10 km maximum reach gives network architects distance headroom beyond same-room and short-campus interconnects, while the 100G transport rate supports high-bandwidth aggregation and backbone links. The QSFP28 format keeps the optical interface at the equipment port rather than requiring an external media-conversion appliance. Select this module where the installed fiber path is single-mode, the endpoint interfaces accept QSFP28 optics, and the required link budget falls within its 10 km rating. Its combination of 100G LR4 optics, LC connectivity and TAA designation distinguishes it within the QSFP28 optical family. Validate connector type, fiber type, reach requirement and host-platform optical support before installation to maintain a matched end-to-end link.