Editing Apple Attachment Unit Interface (section)

==Connector and signals==
AUI uses a [[DA-15 connector]] and a sliding clip to mechanically secure the connection. AAUI replaces these with a small 14-position, 0.05-inch-spaced ribbon contact connector. This connector may have been chosen to avoid confusion with the monitor port on early [[Macintosh]]es, which also uses a DA-15.<ref>{{cite web | url = http://lowendmac.com/tech/aaui.html|author= Knight, Dan |title = Apple's AAUI Ethernet Connector |date=2007-09-04 |access-date = 2009-03-04 | archive-url= https://web.archive.org/web/20090326062546/http://lowendmac.com/tech/aaui.html| archive-date= 26 March 2009 | url-status= live}}</ref> The connector locks into position using two clips or hooks on the sides of the connector outside of the shell which automatically clicks on when plugged in, and can be removed by pulling back on a sliding sheath over the body of the connector, disengaging the hooks. Third-party AAUI devices often omit this sheath, requiring the user to directly squeeze small tabs on the sides of the plug housing to detach the hooks.

AAUI signals have the same description, function, and electrical requirements as the [[Attachment Unit Interface]] (AUI) signals of the same name, as detailed in [[IEEE 802.3]]-1990 CSMA/CD Standard, section 7,<ref name="FOLDOC">{{FOLDOC|Apple+Attachment+Unit+Interface}}</ref> with the exception that most hosts provide only 5 volts of power rather than the 12 volts required for most AUI transceivers. An adapter containing a [[power supply]] to provide the required 12 volts was available from Apple to permit connection of standard AUI transceivers to an AAUI port. This facilitated direct connection to [[10BASE-FL|10BASE-F]] ([[fibre optic]]) and [[10BASE5]] (ThickNet) Ethernet networks, for which AAUI transceivers were not available.<ref>{{cite book |title=Networking Explained, 2nd edition |publisher=O'Reilly |isbn=9780080512594 |page=219 |url=https://www.oreilly.com/library/view/networking-explained-2nd/9781555582524/chapter-64.html |access-date=4 September 2022}}</ref>

{| class="wikitable"
|+AAUI pin-out<ref>{{cite web |title=Apple AUI (AAUI) pinout |url=https://old.pinouts.ru/Net/AAUI_pinout.shtml |website=Handbook of hardware schemes, cables layouts and connectors old hardware pinouts |access-date=4 September 2022}}</ref><ref name="FOLDOC" />
! Pin || Signal name || Signal description
|-
| 1     ||FN Pwr          ||Power (+12&nbsp;V&nbsp;@ 2.1&nbsp;W or +5&nbsp;V&nbsp;@ 1.9&nbsp;W)
|-
| 2     ||DI-A            ||Data In, circuit A
|-
| 3     ||DI-B            ||Data In, circuit B
|-
| 4     ||VC         ||Voltage Common
|-
| 5     ||CI-A            ||Control In, circuit A
|-
| 6     ||CI-B            ||Control In, circuit B
|-
| 7     ||+5 V             ||+5 volts (from host)
|-
| 8     ||+5 V             ||Secondary +5 volts (from host)
|-
| 9     ||DO-A            ||Data Out, circuit A
|-
| 10    ||DO-B            ||Data Out, circuit B
|-
| 11    ||VC             ||Secondary Voltage Common
|-
| 12    ||NC              ||Reserved
|-
| 13    ||NC              ||Reserved
|-
| 14    ||FN Pwr          ||Secondary +12&nbsp;V&nbsp;@ 2.1&nbsp;W or +5&nbsp;V&nbsp;@ 1.9&nbsp;W
|-
| Shell ||Protective Gnd  ||Protective Ground
|}