Apple Attachment Unit Interface
<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.
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