Keep legacy Fast Ethernet links in service while moving traffic onto fiber where distance or isolation demands it. The Allied Telesis AT-DMC100/SC-90 converts 100Base-TX to 100FX/SC in a desktop mini form factor, giving you a compact way to bridge twisted pair and optical fiber at the network edge. With one RJ-45 port and one SC fiber port, this converter is built for direct copper-to-fiber handoff in access closets, remote endpoints, and small distributed network spaces. The design stays focused on the job: preserve the existing Fast Ethernet connection, extend it over fiber, and avoid the cost and disruption of a broader hardware refresh. For organizations managing mixed infrastructure, this model provides a practical transition point between older copper segments and fiber backbones. AC power keeps deployment simple, while the TAA designation supports procurement in government and regulated environments. When the requirement is a reliable media conversion rather than a feature-heavy platform, this Allied Telesis unit delivers a clean, purpose-built answer.