Aui Lan; Aui Lan Connector; Aui Lan Connector Pinouts - HP 743 Service Handbook

Functional Description
Built-in Interfaces

AUI LAN

LAN circuits use the Ethernet/IEEE 802.3 standard interface. Only the Attachment Unit
Interface (AUI) version is used; no BNC connector is provided for ThinLAN. The shared
memory area has the memory controller circuits, 16 Kbytes of RAM, 64 nybbles of non-
volatile storage of the node address, and control, status, and ID registers. Multiplexing of
CPU bus information and the LAN chip set is also part of the controller circuit.
Frontplane circuits include the LAN chip set, timer, and the transceiver chip. The LAN
chip set serves the dual function of a DMA controller and an Ethernet/IEEE 802.3 control-
ler. Encoded data from the serial interface adaptor (SIA) is transmitted by the transceiver
chip. Data from the network is sent by the transceiver chip to the SIA. The AUI connector
enables connections to an external MAU. Figure 2-6 shows the AUI LAN connector and
Table 2-11 shows the LAN connector pinouts.
Figure 2-6
Table 2-11
Pin No.
1
2
3
4
5
6
7
8
2-16

AUI LAN Connector

AUI LAN Connector Pinouts

Signal
GND
CI-A
DO-A
DI-S (GND)
DI-A
GND
CO-A (NC)
CO-S (NC)
Pin No,
9
10
11 DO-S (GND)
12
13
14
15
Signal
CI-B
DO-B
DI-B
+12V
GND
CO-B (NC)