From AllPinouts
Cable pinout for: Cisco Console RJ45 to DB25 Pin
Use this cable to configure a Cisco router thru the Console port at the router.

25 PIN D-SUB FEMALE to the Computer)

RJ45 MALE CONNECTOR To the Cisco router
| RJ45
| DB9
|
| RTS
| 1
| 5
| CTS
|
| DTR
| 2
| 6
| DSR
|
| TXD
| 3
| 3
| RXD
|
| GND
| 4
| 7
| GND
|
| GND
| 5
| 7
| GND
|
| RXD
| 6
| 2
| TXD
|
| DSR
| 7
| 20
| DTR
|
| CTS
| 8
| 4
| RTS
|
References

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