For flexibility, some Cisco routers provide a generic AUI connector for Ethernet ports. These AUI ports are designed to connect to an external transceiver for conversion to a specific media type (e.g. twisted pair, coax, or fiber). The transceiver may either be directly connected to the AUI port or through an AUI Cable as illustrated below:
Ethernet (AUI) Port Pinout (DB-15)
| Pin1 | Ethernet Circuit | Signal |
|---|---|---|
| 3 | DO-A | Data Out Circuit A |
| 10 | DO-B | Data Out Circuit B |
| 11 | DO-S | Data Out Circuit Shield |
| 5 | DI-A | Data In Circuit A |
| 12 | DI-B | Data In Circuit B |
| 4 | DI-S | Data In Circuit Shield |
| 2 | CI-A | Control In Circuit A |
| 9 | CI-B | Control In Circuit B |
| 1 | CI-S | Control In Circuit Shield |
| 6 | VC | Voltage Common |
| 13 | VP | Voltage Plus |
| 14 | VS | Voltage Shield (L25 and M25) |
| Shell | PG | Protective Ground |
Notes
- (1) Any pin not referenced is not connected.