Keep short-reach fiber links stable without overbuying optics. This AddOn SFP transceiver provides 1000Base-SX connectivity over multi-mode fiber with an LC connector, 850 nm wavelength, and reach up to 550 m. It is built for Gigabit Ethernet data networking and optical network deployments where the existing fiber plant is already in place and predictable interoperability is essential. Designed as a compatible replacement for Avaya/Nortel AA1419013-E5 environments, this module is MSA compliant, hot-swappable, and TAA compliant for procurement workflows that require documented sourcing. AddOn states that each unit is programmed, uniquely serialized, and tested for data traffic and application initialization, which helps reduce deployment risk when replacing OEM optics. The lifetime warranty adds long-horizon value for teams standardizing spares across access and aggregation layers. For infrastructure teams balancing uptime, compatibility, and cost control, this is a practical optical module for enterprise fiber runs.