Summary This Recommendation describes a method for bonding of multiple digital subscriber lines (DSL) for Ethernet transport. This Recommendation can support SHDSL, VDSL and ADSL transport as well as future xDSL technologies as they emerge. This Recommendation builds on the IEEE 802.3ah-2004 methods and extends Ethernet transport over other xDSL technologies, including ADSL. The Recommendation does not describe the details of the specific xDSL transport technology. Rather, it focuses on the aspects of the PCS layer modifications required for bonding. This version of the Recommendation integrates all the previous amendments and corrigenda with the 2005 version of Recommendation ITU-T G.998.2. This version of Recommendation ITU-T G.998.2 corrects or adds the following functionality: "Amendment 1 addresses differential delay for aggregation of ADSL2plus links and of VDSL2 links. "Amendment 2 includes new functionality for discovery/aggregation and pair management at the bonding layer. "Amendment 3 includes a new clause 9 defining "intentional temporary shutdown of some bonded lines" (new functionality). "Amendment 4 includes a new Annex D defining ''Ethernet bonding with DTU encapsulation'' (new functionality). "Corrigendum 1 fixes an occurrence of inconsistency.