Specifications

Hardware Configuration
2–43
AUI Interface (J8)
You can connect the Ethernet interface to a LAN through the standard Adapter Unit Interface (AUI)
connection. The AUI connects to an external transceiver or MAU which, in turn, connects to the LAN
cable. The AUI enables you to connect your node to fiber optic, thick net cable, or other Ethernet media,
with the appropriate MAU. Connect the AUI adapter cable to J8. Ampro offers an optional AUI adapter
cable to connect between J8 and a standard MAU adapter cable. Length of the MAU cable should be less
than 24 inches.
If you use the AUI interface, you must supply +12V, via the PC Expansion Bus connector, J1A/B, or
power connector, J10.
Note
This is the only Little Board/P5i interface that requires an external
+12V supply.
If you use the AUI interface, you must select it in SETUP. You cannot use the RJ45 interface and the
AUI interfaces simultaneously.
The following table lists the signals and pin numbers of J8 and a MAU-compatible DB-15:
Table 2–34 AUI Connector (J8)
J8 Pin
AUI
DB-15 Pin Function
1 9 - Collision Detect
2 2 + Collision Detect
3 10 - Transmit Data
4 3 + Transmit Data
7 12 - Receive Data
8 5 + Receive Data
9 13 +12V Power*
5, 6, 10 4, 11, 6 Ground
1, 7, 8, 14, 15 N/C
Twisted pairs: 1/2, 3/4, 7/8