Deliver dependable Fast Ethernet connectivity across longer fiber spans with this AddOn Networks compatible 100BASE-FX SFP transceiver. Designed for Allied Telesis AT-SPFX/15 compatibility, it provides a compact hot-swappable interface for environments where maintaining existing switch platforms is more cost-effective than replacing them. The 15 km reach makes it suitable for inter-building runs, remote closets, and other long-distance fiber links that still rely on 100 MbE transport. This module is a strong fit for teams that need a controlled, procurement-friendly option without overbuying bandwidth for legacy segments. TAA compliance supports public-sector and regulated purchasing requirements, while the SFP form factor keeps inventory and replacement straightforward. When the network design calls for stable Fast Ethernet over fiber rather than a platform refresh, this transceiver preserves infrastructure value and keeps the link layer aligned with the installed base.