Reference and Sources: 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 | 1 Any pin not referenced is not connected.
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