# Dialogic® MD1 RJ-21 interface

The following illustration shows a Dialogic® MD1 RJ-21 male interface:

## Pin assignments

The Dialogic® MD1 RJ-21 interface uses the following pin assignments:

Trunk | Transmit to network pin assignments | Receive from network pin assignments
Ring | Tip | Ring | Tip
1 and 9 | 1 | 26 | 2 | 27
2 and 10 | 3 | 28 | 4 | 29
3 and 11 | 5 | 30 | 6 | 31
4 and 12 | 7 | 32 | 8 | 33
5 and 13 | 9 | 34 | 10 | 35
6 and 14 | 11 | 36 | 12 | 37
7 and 15 | 13 | 38 | 14 | 39
8 and 16 | 15 | 40 | 16 | 41
Not used | 17 through 25 42 through 50