Editing VDSL (section)

==VDSL2 vectoring==
Vectoring is a transmission method that employs the coordination of line signals for reduction of [[crosstalk]] levels and improvement of performance. It is based on the concept of [[Active noise control|noise cancellation]], much like [[noise-cancelling headphones]]. The '''ITU-T G.993.5''' standard, "Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers" (2010), also known as '''G.vector''', describes vectoring for VDSL2. The scope of Recommendation ITU-T G.993.5 is specifically limited to the self-FEXT ([[far-end crosstalk]]) cancellation in the downstream and upstream directions. The [[far-end crosstalk]] (FEXT) generated by a group of near-end transceivers and interfering with the far-end transceivers of that same group is cancelled. This cancellation takes place between VDSL2 transceivers, not necessarily of the same profile.<ref>{{cite web|author=tsbmail |url=http://www.itu.int/rec/T-REC-G.993.5/en |title=G.993.5 : Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers |publisher=Itu.int |date=2013-06-14 |access-date=2013-07-04}}</ref><ref>{{Cite web |url=http://www.ericsson.com/res/thecompany/docs/journal_conference_papers/broadband_and_transport/itu-ts_new_g_vector_standard_proliferates_100mbs_dsl.pdf |title=The ITU-T's New G.vector Standard Proliferates 100 Mb/s DSL |access-date=2016-07-24 |archive-date=2018-12-27 |archive-url=https://web.archive.org/web/20181227171441/https://www.ericsson.com/res/thecompany/docs/journal_conference_papers/broadband_and_transport/itu-ts_new_g_vector_standard_proliferates_100mbs_dsl.pdf |url-status=dead }}</ref> The technology is analogous to G.INP and Seamless Rate Adaptation (SRA).<ref>{{Cite web|title=What is VDSL Vectoring, SRA and G.INP ?|url=https://www.draytek.co.uk/support/guides/kb-what-is-vdsl-vectoring-sra-and-ginp|access-date=2021-01-25|website=www.draytek.co.uk}}</ref>

Although technically feasible, as of 2022, vectoring is incompatible with [[local-loop unbundling]], but future standard amendments could bring a solution.{{citation needed|date=April 2019}}