Preserve critical fiber links without redesigning the network. This AddOn Networks 1000BASE-XD SFP transceiver is built for Avaya/Nortel compatibility and TAA-compliant procurement environments, giving IT teams a straightforward option for maintaining installed infrastructure. It is designed for organizations that need a replacement optic that fits the operational and sourcing requirements of enterprise and public-sector deployments. For teams managing mixed-vendor environments, compatibility matters as much as throughput. This module supports 1000BASE-XD Gigabit Ethernet over fiber in an SFP form factor, making it suitable for switch uplinks and access-layer connections where stable optical performance is required. Choosing a compatible transceiver can reduce downtime risk, simplify spares planning, and avoid the premium often attached to OEM-branded optics. AddOn Networks positions this module for practical lifecycle extension: keep existing hardware in service, standardize spare inventory, and maintain procurement flexibility. It is a focused choice for organizations that value verified fit and predictable replacement economics over unnecessary feature inflation.