| ISDN BRI U Port Pinout |
|---|
| Pin | Function |
|---|---|
| 1 | Not used |
| 2 | Not used |
| 3 | Not used |
| 4 | U interface network connection (Tip) |
| 5 | U interface network connection (Ring) |
| 6 | Not used |
| 7 | Not used |
| 8 | Not used |
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