X.21 DB25 to DB15 Cable Pinout - AllPinouts
From AllPinouts
serial interface cable
| Name | Pin | Direction | Pin | Name | Description |
|---|---|---|---|---|---|
| 2 | 2 | ||||
| 3 | 4 | ||||
| 4 | 3 | ||||
| 6 | 12 | ||||
| 7 | 8 | ||||
| 8 | 5 | ||||
| 14 | 9 | ||||
| 15 | 6 | ||||
| 16 | 11 | ||||
| 20 | 10 | ||||
| 21 | 13 |
Notes
- It could be used to connect a DB25 interface of a router to a DB15 port of a modem

