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BBWF 2013: The Numbers Are In - Vectoring Makes G.Fast Faster

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Presentation given by Paul Spruyt, DSL Strategist, Alcatel-Lucent, at Broadband World Forum 2013 during the G.Fast Workshop presented by Alcatel-Lucent -- October 23, 2013.

Presentation given by Paul Spruyt, DSL Strategist, Alcatel-Lucent, at Broadband World Forum 2013 during the G.Fast Workshop presented by Alcatel-Lucent -- October 23, 2013.

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  • 1. THE NUMBERS ARE IN – VECTORING MAKES G.FAST FASTER Paul Spruyt, DSL Strategist, Alcatel-Lucent 23 October, 2013 1 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
  • 2. THE NEED FOR VECTORING WITH G.FAST G.Fast crosstalk examples -90 Receive PSD [dBm/Hz] -80 -90 direct channel 1 direct channel 2 crosstalk channel 1  2 crosstalk channel 2  1 -70 -80 Receive PSD [dBm/Hz] -70 -100 -110 -120 -130 -140 -100 -110 -120 -130 0 50 100 150 Frequency [MHz] 200 250 -140 0 50 100 150 Frequency [MHz] 200 At the very high frequencies used by G.fast, crosstalk coupling can be much stronger than in VDSL2 band and reach level of useful signal 2 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 250 CROSSTALK OCCURS BETWEEN DIFFERENT LINES IN SAME CABLE
  • 3. G.FAST REQUIRES VECTORING2.0 ADSL(2+) • To get most bit rate out of G.fast • To guarantee stability • To prevent PSD mask violations 8b G.fast 106 MHz G.fast 212 MHz 30a • To cope with discontinuous operation  Traffic controlled power saving • + Much higher processing speed per port Aggregate net data rate [Mb/s] 800  With linear or non-linear pre-coding •  Advanced vectoring required 17a G.fast single line (17.7 – 106 MHz) 600 G.fast vectored 400 Xtalk 200 G.fast full FEXT 0 50 3 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 100 150 200 loop 250 length [m]
  • 4. THE NUMBERS ARE IN − VECTORING 2.0 MAKES G.FAST FASTER data rate [Mb/s] 2 pairs active in same cable single user vector 2.0 non-vectored time 2.2 – 106 MHz 2.2 – 212 MHz 4 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
  • 5. TYPICAL APPLICATIONS FOR G.FAST & G.FAST VECTORING FTT… NODE CURB MANHOLE POLE BUILDING WALL FRONTDOOR >200 METER <200 METER a.k.a. “FTTdp” >100 SUBS 10s OF SUBS (Distribution Point) VDSL2 VECTORING VDSL2 VECTORING VDSL2 EVOLUTION TO G.FAST VECTORING EVOLUTION TO G.FAST 5 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 10s OF METERS 1 SUB
  • 6. FIBER TO THE DISTRIBUTION POINT (FTTDP) VDSL2 SHORT TERM, G.FAST IN FUTURE • Gradual deeper fiber deployment: FTTdp / FTTB • Facilitate FTTH  To boost bit rates beyond what is possible from cab  Stay out of house / apartment with fiber  Reduce cost of FTTH • Multi-port DPU (distribution point unit) • Single-port DPU  Typically requires vectoring  Typically reverse powered (shared) FTTcurb  No vectoring needed  Reverse powered (independent per user) FTTB ~FTTH 1 DPU per apartment CPE manhole, mini-cabinet, pole-mount, …. CPE CPE single-port DPU CPE multi-port DPU multi-port DPU 6 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. CPE CPE
  • 7. CONCLUSION − G.FAST REQUIRES VECTORING 2.0 • At the very high frequencies used by G.fast, crosstalk coupling can be much stronger than in VDSL2 band − Crosstalk can reach level of useful signal • G.fast shall vector, or shall not be - Except in deployment scenarios without crosstalk, e.g. Fiber-to-the-Frontdoor or pure starFTTdp • Characteristics of G.fast require advanced Vectoring 2.0 • G.fast vectoring 2.0 demonstrated by Alcatel-Lucent in lab of several operators 7 COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED.