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ADSL Technology Evolution ADSL2/ADSL2plus/ADSL-RE Peter LeBlanc 2005
©DSL Forum Today there are various DSL Technology Options FamilyITUNameRatifiedMaximum Speed capabilities ADSLG.992.1G.dmt19997 Mbps down 800 kbps up ADSL2G.992.3G.dmt.bis20028 Mb/s down 1 Mbps up ADSL2plusG.992.5ADSL2plus Mbps down 1 Mbps up ADSL2-REG.992.3Reach Extended20038 Mbps down 1 Mbps up SHDSL (updated 2003) G.991.2G.SHDSL Mbps up/down VDSLG.993.1Very-high-data-rate DSL Mbps down 15 Mbps up VDSL2 -12 MHz long reach G.993.2Very-high-data-rate DSL Mbps down 30 Mbps up VDSL MHz Short reach G.993.2Very-high-data-rate DSL Mbps up/down
©DSL Forum A Brief Examination… ADSL2 –Approved by ITU-T as G July 2002 –Features Improved rate – up to 12Mbps by 1Mbps Improved reach – around 600ft / 180m –Power cutback capability –Reduced framing overhead –Better modulation efficiency –Channelisation capability –Bonding of lines
©DSL Forum A Brief Examination… ADSL2+ (or ADSL2plus) –Approved by ITU-T as G January 2003 –Features Much increased rates – up to 20Mbps by 1Mbps –Doubled downstream frequency band to 2.2Mhz Reduced cross talk Allows provision of advanced services Builds on all ADSL2 features Legacy interoperable
©DSL Forum Timing and Implementation ADSL2-now ADSL2+-now VDSL (1)-now VDSL2-late 2005 –Chipsets being released in quantity –Manufacturers assume ratification by end September 2005
©DSL Forum Service Migration Issues ADSL2+ –Backward interoperable Services now available Being installed as the “standard” modem chip set Interoperability problems effectively overcome VDSL2 –ADSL, ADSL2 and ADSL2+ interoperable Chip sets coming available very fast Modems will be in mass supply in early 2006
©DSL Forum Increasing Revenue Triple / Quad play is becoming a reality! –ADSL2+ and VDSL2 both offer wide area 20+Mbps multi-channel speeds Allows FTTC and direct from exchange service Full service residential 50Mbps by 10Mbps – max Wide area business Ethernet Feeder transport to remote nodes – using bonding 3 x HDTV (VDSL2), Internet, voice, gaming etc
©DSL Forum Network Scalability ADSL2+ and VDSL2 –With VDSL2 now approved: Backward compatible with ADSL2+ etc Offers highly scalable networks Creates new flexibility for service providers Steadily take fibre closer to the subscriber –Migrate ADSL → ADSL2+ → VDSL2 Easily implemented service expansion and upgrade
©DSL Forum Standards evolution empower Video delivery at higher speeds ADSL2plus (G.992.5) >downstream bandwidth boost up to 24.5 Mb/s Reach Extended ADSL: RE-ADSL2 (G annex L) >loop reach increase of 600 to 900 m at low rates (192 kb/s DS + 96 kb/s US) Next Generation ADSL: ADSL2 (G.992.3) performance improvement (+100 kb/s on average) improved interop, loop diagnostics, robustness > improved initialization & fast start-up > power management ADSL Double upstream (G.992.3/5 annex M) >double upstream bandwidth Very high speed DSL bandwidths up to 100 Mb/s on short loops different band plans Plan 997: compromise band plan for symmetric and asymmetric traffic Plan 998: optimized for asymmetry Plan Fx: flexible band plan VDSL2 Most service providers are updating with a triple pack: ADSL2, ADSL2plus and RE-ADSL at the same time
©DSL Forum Summary ADSL2+ and VDSL2 offer triple play at last –Reach allows wider serving areas –Rates allow triple play and enhanced services –Ethernet rapidly taking over from ATM Offers LAN extension type services – no signal conversion –Network architecture evolving faster than ever before – DSL Forum driven
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