
Functional Description
Built-in Interfaces
2-16
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
AUI LAN Connector
Table 2-11
AUI LAN Connector Pinouts
Pin No.
Signal
Pin No,
Signal
1
GND
9
CI-B
2
CI-A
10
DO-B
3
DO-A
11
DO-S (GND)
4
DI-S (GND)
12
DI-B
5
DI-A
13
+12V
6
GND
14
GND
7
CO-A (NC)
15
CO-B (NC)
8
CO-S (NC)
Summary of Contents for 9000 Series 743
Page 6: ...Electrostatic Discharge ESD Precautions vi ...
Page 17: ...1 1 1 Product Information ...
Page 31: ...2 1 2 Functional Description ...
Page 58: ...Functional Description Power Distribution 2 28 Figure 2 9 Power Distribution Diagram ...
Page 59: ...3 1 3 Configuration ...
Page 91: ...4 1 4 Troubleshooting ...
Page 125: ...5 1 5 Field Replaceable Units ...
Page 159: ...6 1 6 Reference Documentation ...