Keep 100-Mbps copper devices connected when the network path needs multimode fiber. Black Box LMC213A-MMST-R2 converts Fast Ethernet traffic from 100-Mbps copper to 100-Mbps multimode, giving infrastructure teams a practical way to bridge legacy endpoints into fiber-backed segments without replacing working equipment. This converter fits environments where copper runs are no longer the right answer: longer cable paths, electrical noise, or the need to separate network segments across buildings or plant areas. By translating the link at the edge, it helps preserve existing Fast Ethernet investments while supporting a cleaner fiber architecture upstream. For procurement teams, the value is in targeted extension rather than wholesale replacement. For engineers, it is a simple way to keep a known-good copper device in service while meeting the physical constraints of the site. Use it where stable 100-Mbps connectivity matters and the network design calls for multimode fiber.