AUI代表附件单元接口。 AUI是以太网标准的一部分，它指定电缆如何连接到以太网卡。 AUI是物理和逻辑接口。在用于10BASE5以太网的IEEE 802.3标准中定义了AUI。 AUI连接器是一个15端口连接器，可在以太网节点的物理信令和媒体连接单元(MAU)之间提供一条路径。
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| S.No. | Signal | Description | |||
|---|---|---|---|---|---|
| 1 | CI-S | Control In Circuit Shield | |||
| 2 | CI-A | Control In Circuit A | |||
| 3 | DO-A | Data Out Circuit A | |||
| 4 | DI-S | Data In Circuit Shield | 5 | DI-A | Data In Circuit A |
| 6 | VC | Voltage Common (0 V) | |||
| 7 | CO-A | Control Out Circuit A (not used) | |||
| 8 | CO-S | Control Out Circuit Shield (not used) | |||
| 9 | CI-B | Control In Circuit B | |||
| 10 | DO-B | Data Out Circuit B | |||
| 11 | DO-S | Data Out Circuit Shield (not used) | |||
| 12 | DI-B | Data In Circuit B | 13 | VP | Voltage Plus (+12 V) |
| 14 | VS | Voltage Shield (not used) | |||
| 15 | CO-B | Control Out Circuit B (not used) | |||
| Shell | PG | Protective Ground |