1. ITU-T Recommendation G.992.1 Asymmetric Digital Subscriber Line (ADSL) transceivers 1999
2. ITU-T Recommendation G.992.2 Splitterless Asymmetric Digital Subscriber Line (ADSL) transceivers 1999
3. ITU-T Recommendation G.992.3 Asymmetric Digital Subscriber Line Transceivers 2 (ADSL2) 2009
4. ITU-T Recommendation G.993.5 Asymmetric Digital Subscriber Line 2 Transceivers (ADSL2) - Extended Bandwidth ADSL2 (ADSL2plus) 2009