Definition

AUI (attachment unit interface)

The AUI (attachment unit interface) is the 15-pin physical connector interface between a computer's network interface card (NIC) and an Ethernet cable. On 10Base-5 ("thicknet") Ethernet, a short cable is used to connect the AUI on the computer with a transceiver on the main cable. In 10Base-2 or "thinnet" Ethernet networks, the NIC connects directly to the Ethernet coaxial cable at the back of the computer.

IEEE 802.3, the Ethernet standard, defines the AUI 15-pin physical layer interface. This interface is also called a DB-15 interface or a DIX interface (DIX refers to the three major companies who helped standardize Ethernet: Digital Equipment Corporation, Intel, and Xerox).

Content Continues Below

Download this free guide

Download: Guide to Network Management in the Enterprise

Network management is a cornerstone of IT that helps ensure that enterprises run efficiently and effectively end to end. In this network management guide, we dig deep into functions, techniques, best practices, next-generation technology (like AI and machine learning), and more. Download now to help ensure that you have a resilient network for current and future demands.

Corporate E-mail Address:

You forgot to provide an Email Address.

This email address doesn’t appear to be valid.

This email address is already registered. Please login.

You have exceeded the maximum character limit.

Please provide a Corporate E-mail Address.
- I agree to TechTarget’s Terms of Use, Privacy Policy, and the transfer of my information to the United States for processing to provide me with relevant information as described in our Privacy Policy.
Please check the box if you want to proceed.
- I agree to my information being processed by TechTarget and its Partners to contact me via phone, email, or other means regarding information relevant to my professional interests. I may unsubscribe at any time.
Please check the box if you want to proceed.