PCI/FDDI Adapter This is an old FDDI card, with an MC68K 32bits processor embeded.

MEDIA-DEPENDENT ADAPTER (MDA) or media dependent adapter - A module that can be inserted into a modular Ethernet switch to provide connectivity between different media types. Modular Ethernet switches typically have two to four media-dependent adapter (MDA) slots on the front panel, where you can easily insert and remove MDAs for providing various media connectivity configurations. Graphic M-7. Media-dependent adapter (MDA). Typical MDAs might provide Eight 10BaseT ports Two 100BaseTX or 100BaseFX ports A Fiber Distributed Data Interface (FDDI) double-ring connection By selecting and inserting different MDAs into a modular switch, you can quickly reconfigure complex Ethernet networks. Bridging between the different types of media is performed internally by the chassis circuitry inside the switch.