What is AUI Ethernet?

AUI (Attachment Unit Interface) Ethernet is a standard interface used to connect a computer's Ethernet controller to an external transceiver or physical layer device, typically over a cable. It was commonly used in early Ethernet systems to facilitate communication between the digital circuitry of a computer and the analog circuitry of a transceiver. AUI consists of a 15-pin connector and supports various Ethernet standards, including 10BASE5 and 10BASE2. While it has largely been replaced by more integrated solutions, AUI played a crucial role in the development of Ethernet networking.