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Dynamic Spectrum Management the path to Gbps DSLs/ future of copper. FCC Via video conference November 19, 2009. John M. Cioffi Prof Emeritus, Stanford U Chairman and CEO, ASSIA Inc . Broadband is DSL !. DSL is largest fraction (over 70% of broadband)

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Dynamic Spectrum Management the path to Gbps DSLs/ future of copper

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Dynamic Spectrum Managementthe path to Gbps DSLs/ future of copper

FCC

Via video conference

November 19, 2009

John M. Cioffi

Prof Emeritus, Stanford U

Chairman and CEO, ASSIA Inc.


FCC

Broadband is DSL !

  • DSL is largest fraction (over 70% of broadband)

    • And growing faster (even fiber connects are VDSL)

    • It costs a lot less

360M in 2012

Many are FTTB

With VDSL to customer

Source: Point Topic


FCC

How Fast is Copper?

  • 10 Gbase-T is 2.5 Gbps/pair

    • at 100m on category 6 twisted pair

  • 150Mbps – 500Mbps DSLs demonstrated

    • 100m on category 3 twisted pair

  • Ubiquitous100Mbps to 1 Gbps DSLs?

    • Dynamic Spectrum Management (DSM)

      • Soon, cheap, and energy efficient

  • And, a lot of signal processing


Technical Challenges in DSL

Changing environment

with daily DSL usage patterns

with daily appliance usage patterns

with customer adds and drops

with construction in the community

FCC

In-home Interference

  • Noise and interference

    • interference from in-home sources

    • interference from outside sources

    • interference from other DSL lines

    • wiring problems (in-home and outside)

DSLAM

Crosstalk

Core Network

Copper Impairments

Radio Interference

4


Basic DSM functions today

DSM Improves

Operations cost

Data rate versus Length

Power consumption

FCC

Reprofiling Loop

Diagnostics Loop

  • Automatic line repair

    • QoS target

    • rate target

  • Diagnostics

    • copper

    • DSL

  • Upgrade ident.

OSS,

customer care

Daily collection from all lines

DSL

Access

Network

5


DSM Unlocks xDSL Potential

DSM server/software

  • vectored

  • - xalk cancel

  • mgmt of power,

  • - apps, crosstalk

CPE Noise Cancellation

  • stability

  • - diagnostics

  • active noise cancellation

  • premises-based diagnostics

  • standards compatible, but independent

Mbps

DSL Potential

125

100

75

50

DSM III & G.vector

- multi-line data & control

DSM II

- multi-line data, single line control

25

DSM I

- single line data & control

Date

2009

2010

2011

2012

6

FCC


FCC

DSM Level 1 Example (23M+ today)

  • DSM Level 1 is deployed on

    • 17M lines in USA

      • Will approach 30M by YE2010

    • 6M DSLs in Europe

      • Will exceed 15M by YE2010

Stability Before DSM

Stability After DSM

5%

8%

1%

Dnstrm Rates Before DSM

Dnstrm Rates After DSM

3%

13%

3%

13%

14%

19%

40%

29%

11%

16%

61%

24%

47%

19%

23%

29%

CV<=50 and Retrain<=0

21%

CV<=250 and Retrain<=1

Above 14.5Mbps

CV<=1000 and Retrain<=2

12~14Mbps

CV<=5000 and Retrain<=3

10~12Mbps

Others

7~10Mbps

5.7~7Mbps

Below 5.7Mbps


FCC

Level 3 DSM: ITU G.993.5 VDSL2+

Bonding+Vectoring

Vectoring - 1 pair

North America

Residential

Europe

Residential

Single-pair,

No vectoring

  • 100-pair Telco cable, 4x25-pair binders (NIPP-NAI model)

  • Does not include Telco cross-box, so gains may be larger!


Bonding “GDSL” – 4-pair drop

Symmetric Data Rate vs Cable Length for 4 twisted pairs as a MIMO Channel

35 MHz band plan, 21 dBm aggregate power (US and DS combined), -150 to -140 dBm/Hz linear noise increase, Coding gain 6 dB

2

Bit cap = 20

  • Up to 7 channels

  • 30MHz

1.5G

1.5

7

6

5

4

3

2

1

0

Data Rate in Gbps

1.0G

1

0.5

0

100

200

300

400

500

600

700

800

900

1000

Cable Length in meters

3000’

1500’

9

11/19/09

FCC


The DSM Opportunity

  • Dynamic Spectrum Management (DSM)

    • Path to 100+ Mbps VDSLs and/or ADSL2+

      • DSM Level 1 – line stability in use now worldwide

      • DSM Level 2 – politeness (higher speeds, lower power) - beginning

      • DSM Level 3 – “G.vector” – 100+ Mbps VDSLs

        • Bonding of multiple lines, etc.

  • DSL is global wire-line revenue growth vehicle

    • Major opportunity for new services triple/quadruple play

    • Video (IPTV, video-phone, You Tube)

    • Dual-Wifi (and/or Femto-cells) fed by DSL

Level 1

1$/line-mo

Level 2

3$/line-mo

Level 3

> 10$/line-mo

10

11/19/09

FCC


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