| Subject | German | English |
| commun. | Datex-L | circuit-switched data exchange (leitungsvermitteltes Datennetz n (Dx-L), network; DBT, X.21, X.22) |
| commun. | Datex-M | multimegabit data exchange network (Multimegabit-Datennetz, DBT, 2-140 Mbit/s SMDS, connectionless ATM network for interconnecting LANs, to IEEE 802.6 (MAN, DQDB), from 1992) |
| commun. | Datex-Netzabschlußgerät | datex terminating unit |
| commun. | Datex-P | packet-switched data exchange (paketvermitteltes Datennetz n (Dx-P), network; DBT, X.21, X.25, corresponds to PSS, GB) |
| commun. | Datex-P 10-Hauptanschluß | synchronous X.25 data link (DBT, 2.4 -48 kbit/s) |
| commun. | Datex-P20-Hauptanschluß | asynchronous dial-up data link via tieline (DBT, 300-1200 kbit/s) |
| IT | DATEX-P-Netz | Datex P |
| commun. | Datex-P20-Wählanschluß | asynchronous dial-up data link via telephone network (DBT X.28 300-1200 kbit/s) |
| commun. | Datex-S | switched satellite data link (vermittelnde Satelliten-Daten-Verbindung, DBT, 1.92 Mbit/s) |