aaui

from The Free On-line Dictionary of Computing (8 July 2008)
Apple Attachment Unit Interface
AAUI

   <hardware, networking> (AAUI) A 14-position, 0.050-inch-spaced
   ribbon contact connector.  Early {Power Macintosh} and Quadras
   had an AAUI (Apple Attachment Unit Interface) {port}
   (rectangular shaped) for {Ethernet}, which requires a
   {transceiver}.  To use {twisted pair} cabling, you would need
   to get a {twisted pair} transceiver for the computer with an
   AAUI port.  Some {Power Macintosh} computers had both an AAUI
   and {RJ-45} port; you can use one or the other, but not both.

   The pin-out is:

     Pin   Signal Name     Signal Description
     ----  --------------  ---------------------------------
     1     FN Pwr          Power (+12V @ 2.1W or +5V @ 1.9W)
     2     DI-A            Data In circuit A
     3     DI-B            Data In circuit B
     4     VCC             Voltage Common
     5     CI-A            Control In circuit A
     6     CI-B            Control In circuit B
     7     +5V             +5 volts (from host)
     8     +5V             Secondary +5 volts (from host)
     9     DO-A            Data Out circuit A
     10    DO-B            Data Out circuit B
     11    VCC             Secondary Voltage Common
     12    NC              Reserved
     13    NC              Reserved
     14    FN Pwr          Secondary +12V @ 2.1W or +5V @ 1.9W
     Shell Protective Gnd  Protective Ground

   AAUI signals have the same description, function, and
   electrical requirements as the {AUI} signals of the same name,
   as detailed in {IEEE 802.3}-1990 CSMA/CD Standard, section 7.

   (2000-02-10)