| Connector | Description |
|---|
| 1 | Socket for the power supply unit |
| 2 | External interface for analogue terminals FXO 1 |
| 3 | Ground |
| 4 | Internal interface for analogue FXS 1 terminals (internal number 20, ex works state) |
| 5 | Internal interface for analogue FXS 2 terminals (internal number 21, ex works state) |
| 6 | Interface for ISDN BRI connections (ISDN S/U internal, ex works state, plug selectable) |
| 7 | Interface for ISDN BRI connections (ISDN S/U external, ex works state, plug selectable) |
| 8 | USB connection type B |
| 9 | 10/100/1000 Base-T Ethernet interface (LAN 1) |
| 10 | 10/100/1000 Base-T Ethernet interface (LAN 2) |
| 11 | 10/100/1000 Base-T Ethernet interface (LAN 3) |
| 12 | 10/100/1000 Base-T Ethernet interface (LAN 4) Preferred WAN port |
| 13 | Not supported |
