DIN ETS 300083:1993-11 Integrated Services Digital Network (ISDN); circuit mode structured bearer service category usable for speech information transfer; terminal requirements necessary for end-to-end compatibility; English version ETS 300083:1993
1993DIN ETS 300083:1993-11 Integrated Services Digital Network (ISDN); circuit mode structured bearer service category usable for speech information transfer; terminal requirements necessary for end-to-end compatibility; English version ETS 300083:1993
1993DIN ETS 300083:1993 Integrated Services Digital Network (ISDN); circuit mode structured bearer service category usable for speech information transfer; terminal requirements necessary for end-to-end compatibility; English version ETS 300083:1993