xDSL tutorial and standards update

In this tutorial we take a detailed look at the International Telecommunication Union (ITU) Study Group 15's G.99x series recommendations (G.lite, G.dmt, G.hs, etc.) that provide a set of worldwide xDSL standards for broadband Internet access. The most noteworthy specification of the group is the G.lite, "splitterless" ADSL, that allows a significantly easier installation that can be performed by consumers. New technologies in development by the ITU for VDSL, SHDSL, and home networking are also be reviewed. An understanding of the xDSL fundamentals will allow consumer unit manufacturers to exploit a new networked class of consumer equipment.