Cisco Console Port for Cisco 1000, 1600, 2500, 2600, And 3600 Series Routers Connector Pinout
From AllPinouts
Connector pinout for: Cisco Console Port for Cisco 1000, 1600, 2500, 2600, And 3600 Series Routers
The console and auxiliary ports on Cisco IOS routers are asynchronous serial ports. The console port is configured as data communications equipment (DCE).
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RJ45 FEMALE CONNECTOR at the Cisco routers)

RJ45 MALE CONNECTOR at the cables
| Pin | Name | Description | Dir |
|---|---|---|---|
| 1 | RTS | Request To Send | OUT |
| 2 | DTR | Data Terminal Ready | OUT |
| 3 | TXD | Tranceive Data | OUT |
| 4 | GND | Ground | - |
| 5 | GND | Ground | - |
| 6 | RXD | Receive Data | IN |
| 7 | DSR | Data Set Ready | IN |
| 8 | CTS | Clear To Send | IN |
