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| German | English |
| Datex-P20-Hauptanschluß | asynchronous dial-up data link via tieline (DBT, 300-1200 kbit/s) |
| Datex-P20-Wählanschluß | asynchronous dial-up data link via telephone network (DBT X.28 300-1200 kbit/s) |
| ESP 20 | Euronet Switching Protocol 20 |
| 500/20 Hz-Ruf | 500/20 signalling |
| 500/20 Hz-Ruf | 500/20 signaling |