High bit rate digital subscriber line 2

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DSL technologies
Standard
ADSL ANSI T1.413 Issue 2
ITU G.992.1 (G.DMT)
ITU G.992.2 (G.Lite)
ADSL2 ITU G.992.3
ITU G.992.3 Annex A
ITU G.992.3 Annex B
ITU G.992.3 Annex J
ITU G.992.3 Annex L
ITU G.992.3 Annex M
ITU G.992.4
ADSL2+ ITU G.992.5
ITU G.992.5 Annex A
ITU G.992.5 Annex B
ITU G.992.5 Annex J
ITU G.992.5 Annex M
HDSL ITU G.991.1
HDSL2  
IDSL  
MSDSL  
PDSL  
RADSL  
SDSL  
SHDSL ITU G.991.2
UDSL  
VDSL ITU G.993.1
VDSL2 ITU G.993.2
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HDSL2 is the 2nd generation of HDSL with a 6dB Noise Margin, put simply it is another way to provision a T-1 line, only this technology relies on fewer wires - two instead of four - and therefore costs less to set up.

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