The HPE HP J4859C is a 1000BASE-SX SFP transceiver module designed for short-range fiber optic communication. It supports data transmission over multimode fiber at distances up to 550 meters, making it ideal for data centers and enterprise LANs that require high-speed, reliable connectivity. This module is hot-swappable, ensuring easy installation and maintenance without network downtime. It integrates seamlessly with HPE networking devices, providing a cost-effective and efficient solution for upgrading or expanding network capacity.