Extend 100 GbE connections across single-mode fiber with a QSFP28 optical module built for 100G DR links. Aruba S3N88A presents duplex LC optical connectivity and supports a stated 500 m reach, placing it between short in-rack copper connections and longer campus or building fiber runs. It provides a compact pluggable interface for equipment with a compatible QSFP28 optical port. Use this transceiver where a 100 GbE uplink, aggregation connection, or inter-switch link must traverse existing single-mode fiber terminated in LC connectors. The 500 m optical reach suits cross-room, cross-floor, and many same-building pathways without requiring a parallel-fiber MPO/MTP connector system. Match the installed fiber type, duplex LC patching, link budget, and host-platform optical compatibility before deployment. Within 100 GbE QSFP28 optics, the defining characteristics are the 100G DR interface, single-mode-fiber operation, duplex LC termination, and 500 m reach. These details matter when replacing an optic or standardizing links: connector type and fiber mode must match both ends of the circuit. The module is an optical transceiver rather than a DAC cable or media converter, so it installs directly into a compatible network-device QSFP28 port.