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.

(2000-02-10)