G.992.5 (also referred to as ADSL2+, G.dmt.bis+, and G.adslplus) is an ITU-T standard for asymmetric digital subscriber line (ADSL) broadband Internet access.The standard has a maximum theoretical downstream sync speed of 24 Mbit/s.Utilizing G.992.5 Annex M upstream sync speeds of 3.3 Mbit/s can be achieved.