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((short description|Physical and logical interface defined in the original Ethernet standard))
((refimprove|date=July 2011))

[[File:AUI Connectors.jpg|thumb|AUI Connectors. The male connector (left) is on the MAU and the female connector (right) is on the MAC device (normally either a [[computer]] or an [[Ethernet hub]]). Note the sliding clip.]]
[[File:AUI connector on DEC EtherWorks LC (DE100).jpg|thumb|AUI Connector with numbered pins on the [[Digital Equipment Corporation|DEC]] EtherWorks LC (DE100) [[Ethernet]] controller. Note the [[jackposts]] (as opposed to a sliding clip).]]

The '''Attachment Unit Interface''' ('''AUI''') is a physical and logical interface defined in the original [[IEEE 802.3]] standard for [[10BASE5]] Ethernet<ref>((cite web|title=IEEE Standard for Ethernet, Section 1, Clause 7|url=https://standards.ieee.org/about/get/802/802.3.html|publisher=IEEE Computer Society|access-date=14 February 2017))</ref> and the previous [[Ethernet#History|DIX standard]]. The physical interface consists of a 15-pin [[D-subminiature]] connection that provides a path between an [[Ethernet]] node's [[Physical layer#Physical signaling sublayer|physical signaling]] and the [[Medium Attachment Unit]] (MAU),<ref>IEEE 802.3 ''7. Physical Signaling (PLS) and Attachment Unit Interface (AUI) specifications''</ref> sometimes also known as a [[transceiver]]. An AUI cable may be up to ((convert|50|m|ft|abbr=off)) long, although frequently the cable is omitted altogether and the MAU and [[medium access controller]] MAC are directly attached to one another. On Ethernet implementations without separate MAU and MAC, the AUI is omitted.

AUI connectors became rare beginning in the early 1990s when computers and hubs began to incorporate the MAU, particularly as the [[10BASE-T]] standard became more common and use of [[10BASE5]] (thicknet) and [[10BASE2]] (thinnet) declined((Citation needed|date=February 2017)). The electrical AUI connection was still present inside the equipment. With the introduction of [[Fast Ethernet]] the AUI became obsolete, and was replaced by the [[Media Independent Interface]] (MII).<ref>[https://40gethernet.wordpress.com/2009/05/08/overview-of-the-xaui-xlaui-and-caui-part1/ Overview of the XAUI, XLAUI and CAUI: Part1] ((Webarchive|url=https://web.archive.org/web/20190517201905/https://40gethernet.wordpress.com/2009/05/08/overview-of-the-xaui-xlaui-and-caui-part1/ |date=2019-05-17 )), ''"...the existing AUI was not suitable and it was replaced by the MII interface..."''</ref> [[Gigabit Ethernet]] and [[10 Gigabit Ethernet]] have respectively the [[GMII]] and [[XGMII]] interfaces. A 10 Gigabit Ethernet interface called [[XAUI]] was developed to extend the operational distance of the XGMII and to reduce the number of interface signals.

A modified form using a smaller connector called the [[Apple Attachment Unit Interface]] (AAUI) was introduced on [[Apple Macintosh]] computers in 1991, and its use discontinued in 1998.<ref>((cite web|last=Dan|first=Knight|title=Apple's AAUI Ethernet Connector|url=http://lowendmac.com/tech/aaui.html|access-date=13 February 2012))</ref>

== Connector and signals ==
An AUI connector is a DA-15 ([[D-subminiature]]). It often has a sliding clip in place of the thumbscrews normally found on a D-connector to hold two connectors together. This clip permits the MAU and MAC to be directly attached to one another even when their size and shape would preclude the use of thumbscrews. This clip is however frequently found to be awkward and/or unreliable.((By whom|date=February 2017))
In case of incompatible fittings, either the jackposts or the sliding clip mechanism could be unscrewed and replaced with the other, or adapter dongles or cables could be used.

{| class="wikitable sortable " style="text-align: center;" | 
|-
!colspan="3" align="center"|[[Image:DA-15 DSubminiatures female.svg|300px]]
|-
|+AUI [[pinout]]
!  Pin || Signal || Direction || Description
|-
| ((0))3 || DO-A || AUI→MAU || style="text-align: left;" | Data Out Circuit A
|-
| 10 || DO-B || AUI→MAU || style="text-align: left;" | Data Out Circuit B
|-
| 11 || DO-S || AUI→MAU || style="text-align: left;" | Data Out Circuit Shield (not used)
|-
| ((0))5 || DI-A || MAU→AUI || style="text-align: left;" | Data In Circuit A
|-
| 12 || DI-B || MAU→AUI || style="text-align: left;" | Data In Circuit B
|-
| ((0))4 || DI-S || MAU→AUI || style="text-align: left;" | Data In Circuit Shield
|-
| ((0))7 || CO-A || AUI→MAU || style="text-align: left;" | Control Out Circuit A (not used)
|-
| 15 || CO-B || AUI→MAU || style="text-align: left;" | Control Out Circuit B (not used)
|-
| ((0))8 || CO-S || AUI→MAU || style="text-align: left;" | Control Out Circuit Shield (not used)
|-
| ((0))2 || CI-A || MAU→AUI || style="text-align: left;" | Control In Circuit A
|-
| ((0))9 || CI-B || MAU→AUI || style="text-align: left;" | Control In Circuit B
|-
| ((0))1 || CI-S || MAU→AUI || style="text-align: left;" | Control In Circuit Shield
|-
| ((0))6 ||   VC || AUI→MAU || style="text-align: left;" | Voltage Common (0 V)
|-
| 13 ||   VP || AUI→MAU || style="text-align: left;" | Voltage Plus (+12 V)
|-
| 14 ||   VS || AUI→MAU || style="text-align: left;" | Voltage Shield (not used)
|-
| Shell ||   PG || AUI→MAU || style="text-align: left;" | Protective Ground
|}

== References ==
((Commons category|Attachment Unit Interface))
((Reflist))

((Ethernet))

[[Category:Ethernet]]
[[Category:Computer connectors]]

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