Transmission media characteristics : recommendations G.601 - G.654 / International Telecommunication Union
General aspects of digital transmission systems : terminal equipments: recommendations G.700 - G.795 / International Telecommunication Union
Line transmission of non-telephone signals : transmission of sound-programme and television signals: series H and J recommendations / International Telecommunication Union
Integrated services digital network (ISDN) : general structure and service capabilities: recommendations I.110 - I.257 / International Telecommunication Union