| Subject | English | Danish |
| commun., nat.sc., polit. | Advanced Research in Telecommunications Systems | program for avanceret forskning i telekommunikationssystemer |
| commun., nat.sc., polit. | Advanced Research in Telecommunications Systems programme | program for avanceret forskning i telekommunikationssystemer |
| commun., IT | automatic telecommunications switching system | fuldautomatisk telefonsystem |
| commun., IT | digital European cordless telecommunications system | digital europæisk trådløs telekommunikation |
| commun. | European digital cellular telecommunications system | Europæisk digitalt cellulært telekommunikationssystem |
| commun. | European digital cellular telecommunications system | europæisk digitalt celleopbygget telekommunikationssystem |
| commun. | global telecommunications system | globalt telekommunikationssystem |
| IT | photonic telecommunication system | lysbaseret kommunikationssystem |
| commun. | planning of a telecommunication system | planlægning af et telekommunikationssystem |
| polit., loc.name., commun. | regional advanced telecommunications systems | avancerede regionale telekommunikationssystemer |
| commun., el. | space telecommunication system | rum-telekommunikations-system |
| commun., IT | suppliers of telecommunications systems | leverandører af telekommunikationssystemer |
| commun. | telecommunication system | telekommunikations-net |
| gen. | telecommunications systems engineering | opbygning af telekommunikationssystemer |
| commun., transp., avia. | Terrestrial Flight Telecommunications System | jordbaseret flytelekommunikationssystem |
| commun., transp., avia. | Terrestrial Flight Telecommunications System | Terrestrial Flight Telephone System |
| el. | terrestrial telecommunication system | telekommunikations-system på jorden |
| commun. | universal mobile telecommunication system | universal mobile telecommunication system |
| commun. | universal mobile telecommunications system | universal mobile telecommunication system |
| commun., industr. | Universal Mobile Telecommunications System | universelt mobiltelesystem |
| commun. | Universal Mobile Telecommunications System | Universelt Mobiltelesystem |
| commun., industr. | Universal Mobile Telecommunications System | universelt mobilt telekommunikationssystem |