The Am79C983A IMR2 device provides 1 standard Attachment Unit Interface (AUI) port, 12 Pseudo Attachment Unit Interface (PAUI) por ts, and 1 Reversible AUI (RAUI) port for direct connection to a media access controller (MAC). The pseudo AUI ports can be connected to external transceivers to support multiple media types, including 10BASE2, 10BASE-T, and 10BASE-FL/FOIRL. The pseudo AUI ports can be turned off individually (without external circuitry) to allow the switching of transceiver