| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | | Not used | |
| | | |
| 2 | | Not used | |
| | | |
| 3 | | Not used | |
| | | |
| 4 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 5 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 6 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 7 | M | Shield | Shield |
| | | |
| 8 | | Not used | |
| | | |
| 9 | | Not used | |
| | | |
| 10 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 11 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 12 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 13 | | Not used | |
| | | |
| 14 | E | Telephone, internal | Basic interface, telephone |
| | | |
| 15 | | Not used | |
| | | |
| 16 | | Not used | |
| | | |
| 17 | | Not used | |
| | | |
| 18 | | Not used | |
| | | |