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| English | German |
| business support system | Business-Support-System |
| electronic switching system with packet switching for interconnection support | EWS mit Paketvermittlung für Verbindungsunterstützung (for VASs) |
| interconnection support system | Verbindungsunterstützungssystem (DTAG, VASs) |
| EWSP-V interconnection support system | Verbindungsunterstützungssystem (DTAG, ITU-T (CCITT) Rec. X.400, supports telex, teletex, TELEBOX & vtx E-mail, packet-switched VASs) |
| operating support system | Betriebssupportsystem |
| operation support system | Betriebsunterhaltungssystem (network management) |
| operations support systems | Operations-Support-System |