Keep older fiber infrastructure serviceable without replacing the entire switch stack. The AddOn MFELX1-AO delivers 100Base-LX connectivity over single-mode fiber with an LC interface and up to 1 km of reach. For teams maintaining legacy access or edge links, that combination provides a straightforward path to restore service and preserve network continuity. This module is hot-swappable, which helps minimize disruption during maintenance or replacement. It is built as a compatible replacement for Linksys MFELX1 environments and is TAA compliant, making it suitable for procurement workflows that require more than a standard commercial optic. In practice, that means fewer surprises during sourcing and a cleaner fit for regulated or public-sector purchasing. When a network still has value in its installed fiber plant, the right replacement optic can extend the life of the infrastructure at a fraction of the cost of a broader refresh. This transceiver is designed for exactly that role: dependable, direct-fit replacement where compatibility, compliance, and controlled spend matter.