This Amendment 4 to ITU-T Rec. G.994.1 was developed to support:

new G.993.2 (VDSL2);

deployment of G.992.5 from the exchange with either G.992.5 or G.993.1/2 from a cabinet:

G.992.5 Annex B from a cabinet;

G.992.5 Annexes J/M:

tone set and code points;

the new proposed PTM TPS-TC based on 64/65-octet encapsulation for G.991.2, G.992.3 and G.992.5;

G.992.3 and G.992.5 amendments:

optional INP_min values,

optional S&D values,

time domain filtering,

Annex C,

Corrigendum for G.992.3 Annexes J/M Submode PSD shape.