International analogue carrier systems : recommendations G.211 - G.544 / International Telecommunication Union
Transmission media characteristics : recommendations G.601 - G.654 / International Telecommunication Union
Digital networks, digital sections and digital line systems : recommendations G.801 - G.961 / International Telecommunication Union
Line transmission of non-telephone signals : transmission of sound-programme and television signals: series H and J recommendations / International Telecommunication Union