| Subject | German | English |
| commun. | Public Switched Telephone Network = Öffentliches Fernsprechnetz | public-switched telephone network |
| comp., MS | Switched Digital Video | switched digital video (Digital video or service that is not made available on the network or system until requested by a customer) |
| commun. | Switched-Loop-Konsole | switched-loop console |
| comp., MS | Telefonfestnetz, Public Switched Telephone Network | public switched telephone network (Public switched telephone network (PSTN) is used by standard analog telephone lines, available worldwide) |