| Pin | Art | Bezeichnung / Signalart | Anschluss / Messhinweise |
|---|
| 1 | M | Masse | Basis Interface Telefon |
| | | |
| 2 | M | Abschirmung | Basis Interface Telefon |
| | | |
| 3 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 4 | E/A | Diagnoseleitung RXD | Basis Interface Telefon |
| | | |
| 5 | M | Masse | Basis Interface Telefon |
| | | |
| 6 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 7 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 8 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 9 | | nicht belegt | |
| | | |
| 10 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 11 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 12 | E/A | Kommunikationsleitung TXD | Basis Interface Telefon |
| | | |
| 13 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 14 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 15 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 16 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 17 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |
| 18 | E | Signal Basis Interface Telefon | Basis Interface Telefon |
| | | |