RJ21 Cable Instruction(AIU-16)
| Color | Tip | Ring | Color | Channel |
| Blue | 26 | 1 | White | Port 1 |
| Orange | 27 | 2 | White | Port 2 |
| Green | 28 | 3 | White | Port 3 |
| Brown | 29 | 4 | White | Port 4 |
| Gray | 30 | 5 | White | Port 5 |
| Blue | 31 | 6 | Red | Port 6 |
| Orange | 32 | 7 | Red | Port 7 |
| Green | 33 | 8 | Red | Port 8 |
| Brown | 34 | 9 | Red | Port 9 |
| Gray | 35 | 10 | Red | Port 10 |
| Blue | 36 | 11 | Black | Port 11 |
| Orange | 37 | 12 | Black | Port 12 |
| Green | 38 | 13 | Black | Port 13 |
| Brown | 39 | 14 | Black | Port 14 |
| Gray | 40 | 15 | Black | Port 15 |
| Blue | 41 | 16 | Yellow | Port 16 |