3X-DEFPA-DC Universal PCI to Dual Attachment Station (DAS) FDDI Controller uses a pair of duplex optics with "SC" connectors (LCF-PMD), and supports up to 2KM of multi-mode fiber (MMF) between stations. This DAS adapter also supports high performance full-duplex operation when connected point-to-point with a cooperating full-duplex FDDI switch or adapter and auto-configures to support high availability "dual-homed" configurations. In addition, the -DC option includes support (RJ12) for connecting an optional, external 3 rd party, Optical Bypass Relay (OBR).