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The console and auxiliary ports on Cisco IOS® routers are asynchronous serial ports. The console port and the auxiliary port are configured as data terminal equipment (DTE). For Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers, the console and auxiliary ports both use RJ-45 connectors. Adapters are available for connections to PC terminals, modems, or other external communications equipment.
This table shows the console port pinouts for the RJ-45 connector:
Console Port (DTE)
1Any pin not referenced is not connected.
This table shows the auxiliary port pinouts of the RJ-45 connector:
Auxiliary Port (DTE)
2Any pin not referenced is not connected.
In order to identify a rollover cable, compare the two modular ends of the cable. Hold the cables in your hand, side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left connector (pin 1) must be the same color as the pin on the outside of the right connector (pin 8). On Cisco cables, pin 1 is white on one connector, and pin 8 is white on the other connector.
This table shows the RJ-45 rolled (console) cable pinouts: