slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Vectoring De-mystified PowerPoint Presentation
Download Presentation
Vectoring De-mystified

Loading in 2 Seconds...

play fullscreen
1 / 48

Vectoring De-mystified - PowerPoint PPT Presentation


  • 125 Views
  • Uploaded on

Vectoring De-mystified. Market Drivers Understanding Vectoring Vectoring Described Benefits of System-Level Implementation. National Goals by 2020: Ubiquitous 100Mbps Broadband. Germany: 100Mbps to 50% of subscribers. France: 100Mbps to 70% of subscribers. US:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Vectoring De-mystified' - rollin


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
vectoring de mystified
Vectoring De-mystified
  • Market Drivers
  • Understanding Vectoring
  • Vectoring Described
  • Benefits of System-Level Implementation
national goals by 2020 ubiquitous 100mbps broadband
National Goals by 2020:Ubiquitous 100Mbps Broadband
  • Germany:
  • 100Mbps to 50% of subscribers
  • France:
  • 100Mbps to 70% of subscribers
  • US:
  • 100Mbps to 100 Million households
  • Reaching 2020 Goal is of National and Global Importance
  • Australia:
  • 100 Mbps to 90% households
it impacts a country s well being
It impacts a country’s well being

“Savings in the health sector …to fall between 1.4% and 3.7% as a direct result of having the new network in place.”

ITU National Broadband Plan Recommendations

“… 10 percent increase in broadband penetration …1.3 percent additional growth GDP.”

ITU National Broadband Plan Recommendations

and drives business success
And Drives Business Success

Higher bandwidth results in more exciting applications which leads to increased adoption and higher revenue per user

Launched in the last 6 years

Super connected subscribers will lead to new industries and companies we can’t even imagine yet

100mbps downstream 25x faster than today s average
100Mbps+ Downstream: 25x faster than today’s average
  • A complete album in 5 sec
  • An Entire HD movie in less than 10 min
  • 4Mbyte photo in 1/3 second
  • Cloud based Multi-screen 3D Gaming.
  • Multi-angle 3D HDTV
100mbps a key service offering
100Mbps: A Key Service Offering
  • 100Mbps services will be mainstream by 2015
100mbps a key service offering1
100Mbps: A Key Service Offering
  • Numerous national and regional broadband plans give 100Mbps as a targeted speed
  • Cable operators are able to offer a 100Mbps tier with DOCSIS 3.0
can wireline service providers compete
Can Wireline Service Providers Compete?
  • FTTH is the ultimate goal but still cost-prohibitive in many deployment scenarios
  • Telcos can be competitive with copper – 100Mbps is practical and economical with VDSL2 vectoring and bonding
  • Let’s see how…
vectoring de mystified1
Vectoring De-mystified
  • Market Drivers
  • Understanding Vectoring
  • Vectoring Described
  • Benefits of System-Level Implementation
vdsl2 fundamentals d iscrete m ulti t one
VDSL2 Fundamentals - Discrete Multi-Tone
  • DMT Line Code Is Made Up of Individual Sinusoidal Carriers Whose Amplitude and Phase Change to Signal the Data Bits
  • The VDSL2 (G.993.2 ) Has Tone Spacing of 4.3125 kHz
    • 8.625 kHz for Profile 30a.
  • The Upstream Spectrum is Separated From Downstream. This Type of Segregation is Frequency Division Duplexing (FDD)
dmt tone modulation
DMT Tone Modulation
  • These figures illustrate the real and imaginary QAM amplitudes for 2, 3 & 4 bit tone modulations on each tone.
  • Each tone carries some number of bits (1≤ bits ≤ 15) based on its signal-to-noise ratio (SNR).

Three bits

Two bits

Four bits

what is crosstalk

NEXT Coupling

DSL1

DSL1

DSL2

DSL2

FEXT Coupling

DSL1

DSL1

DSL2

DSL2

What Is Crosstalk?
how many bits on each tone
How Many Bits On Each Tone?
  • The Number of Bits Carried on Each Tone is Determined by The Effective Signal to Noise Ratio (SNR) Around That Tone.
  • The Greater the SNR, the More Bits Carried on the Tone

SNR

what is vectoring
What is Vectoring?

-FEXT

+FEXT

+FEXT

+FEXT

-FEXT

+FEXT

+FEXT

-FEXT

+FEXT

vectoring de mystified2
Vectoring De-mystified
  • Market Drivers
  • Understanding Vectoring
  • Vectoring Described
  • Benefits of System-Level Implementation
vectoring modifications to startup
Vectoring Modifications to Startup

O-P VECTOR 1 allows existing vectored pairs to learn FEXT couplings from the new line

O-P Vector 1 composed of pilot modulated sync symbols & quiet symbols

Special Operations

Channel (SOC) Active

New Line Error Feedback

aligned synch symbols enable training
Aligned Synch Symbols Enable Training

Downstream Ports

DMT 3

DMT 3

DMT 3

DMT 3

DMT 3

DMT 3

Up Synch 4

DMT 4

Up Synch 4

Up Synch 4

DMT 4

Up Synch 4

DMT 4

Down Synch 1

Down Synch 1

DMT 1

DMT 1

DMT 1

Down Synch 1

Down Synch 1

DMT 2

DMT 2

DMT 2

DMT 2

DMT 2

DMT 2

time

time

time

time

time

time

time

time

Upstream Ports

New Port

estimating the crosstalk
Estimating the Crosstalk.

The CPE reports

the slicer error measured on the synch symbols and

sends it back to the DSLAM

dsl transceivers
DSL Transceivers

DSL Transceiver

Framer

Encoder

Modulator

DSL Transceiver

Framer

Encoder

Modulator

DSL Transceiver

Framer

Encoder

Modulator

DSL Transceiver

Framer

Encoder

Modulator

g 993 5 g vector
G.993.5: G.vector

Framer

Encoder

Modulator

Precoder

Framer

Encoder

Modulator

Precoder

Framer

Encoder

Modulator

Precoder

Framer

Encoder

Modulator

Precoder

Vector Control Entity

g 993 5 g vector1
G.993.5: G.vector

DSL Modem

Framer

Encoder

Modulator

Framer

Encoder

Modulator

Precoder

Precoder

DSL Modem

Framer

Encoder

Modulator

Framer

Encoder

Modulator

Precoder

Precoder

DSL Modem

DSL Modem

Framer

Encoder

Modulator

Framer

Encoder

Modulator

Precoder

Precoder

Framer

Encoder

Modulator

Framer

Encoder

Modulator

Precoder

Precoder

Vector Control Entity

Vector Control Entity

g vector vector control entity vce
G.vector: Vector Control Entity (VCE)

DSL Modem

Framer

Encoder

Precoder

Modulator

DSL Modem

Framer

Encoder

Precoder

Modulator

DSL Modem

Framer

Encoder

Precoder

Modulator

DSL Modem

Framer

Encoder

Precoder

Modulator

Vector Control Entity

  • Vector Control Entity (VCE):
  • coordinates initialization of DSL links: orderly join/leave process
g vector steady state operation
G.Vector Steady State Operation

DSL Modem

Encoder

Data

Data

Data

Data

Data

Data

Data

Data

Data

Sync

Sync

Sync

Data

Data

Data

Data

Data

Data

Data

Data

Data

Framer

Encoder

Precoder

Modulator

DSL Modem

Framer

Encoder

Precoder

Modulator

Encoder

DSL Modem

Framer

Encoder

Precoder

Modulator

Encoder

Vector Control Entity

  • VCE:
  • Synchronizes timing and aligns “sync” symbols on DSL links
  • VCE instructs encoders to transmit probing signal during sync symbols
  • Modems send error signals to VCE
  • VCE updates coefficients for precoders
g vector adding a line
G.vector: Adding a Line

DSL Modem

Encoder

Data

Data

Data

Data

Data

Data

Data

Data

Data

Sync

Sync

Sync

Data

Data

Data

Data

Data

Data

Data

Data

Data

Framer

Encoder

Precoder

Modulator

DSL Modem

Framer

Encoder

Precoder

Modulator

Encoder

DSL Modem

Encoder

Framer

Encoder

Precoder

Modulator

JoiningModem

DSL Modem

Framer

Encoder

Precoder

Modulator

Data

Data

Data

Sync

Data

Data

Data

Encoder

Vector Control Entity

  • VCE instructs encoder for joining modem to be silent during data symbols
  • Instructs all encoders to transmit probing signals during sync symbols
  • Modems send error signals to VCE
  • VCE learns crosstalk couplings from joining modem, updates coefficients for precoders
  • Joining modem can now send data
background on binders
Background on Binders

Binder 1

New line cards or additional systems added

Binder 3

Binder 2

No 1 to 1 correlation between systems and binders

the problem with vectoring some pairs cannot be part of the team
The Problem with VectoringSome Pairs Cannot be part of the Team

Pairs in the same binder need to be handled as a single group to effectively implement vectoring

Crosstalk(FEXT)

measured results downstream
Measured Results: Downstream

Cable Vectoring:

48 lines (24L (rates

shown) + 24R)

in one vector group

12

13

13

12

Binder Vectoring:

24 (Left) Vectored + 24 (Right) unvectored

measured results upstream
Measured Results: Upstream

Cable Vectoring:

48 lines (24L (rates

shown) + 24R)

in one vector group

12

13

13

12

Binder Vectoring:

24 (Left) Vectored + 24 (Right) unvectored

vectoring de mystified3
Vectoring De-mystified
  • Market Drivers
  • Understanding Vectoring
  • Crosstalk, Bonding and Binder Management
  • Vectoring Described
  • Benefits of System-Level Implementation
system level fext cancellation

DSP 1

DSP 1

DSP 1

DSP 2

DSP 2

DSP 2

Cable Plant

Cable Plant

Cable Plant

DSP 4

DSP 4

DSP 4

DSP 3

DSP 3

DSP 3

System Level FEXT Cancellation
the solution is a system approach letting everyone join the team
The Solution is a System ApproachLetting Everyone Join the Team

Multiple OSP DSLAMs or Chassis Cards need to work together as a “system” so that vectoring can be performed across line cards or other OSP DSLAMs

Crosstalk(FEXT)

board level to system level upgradeability
Board Level to System Level Upgradeability

1 Cards = 48 Ports

Card 1

DSL Modem

Binder

Card 2

DSL Modem

2 Cards = 96 Ports

Resource

Card 3

Card 4

DSL Modem

3 Cards = 144 Ports

4 Cards = 192 Ports

osp board level to system level upgradeability
OSP Board Level to System Level Upgradeability

Initially Single OSP has internal BLV

DSL Modem

Binder

DSL Modem

DSL Modem

DSL Modem

System level vectoring OSPs

vectoring benefits and considerations
Vectoring Benefits and Considerations
  • Vectoring has the potential to cancel crosstalk in a binder:
    • All users see rates as if they were the onlyuser in the cable
  • Benefits
    • 30-50% improvement in speed
    • Reach 100Mpbs with 2 pair bonding
  • Considerations
    • Limited to short loops (less than 3,000ft)
    • Need system level approach

100 Mbps to > 2500 ft,

Using 2 pairs

26 AWG equivalent: Multiply vectored reach by 1.3 for 24 AWG

conclusions
Conclusions
  • Complexity of FEXT cancellation will result in longer port training times.
  • FEXT cancellation for VDSL2 shows great promise for applications in which:
    • cable size matches the in-domain group size
    • system level deployment is implemented and group size matches or exceeds the binder size
    • loops are short
    • alien crosstalk is minimal.
  • After FEXT is removed, the resulting low noise floor will likely increase performance sensitivity to impulse noise and component non-linearity
key takeaways
Key Takeaways
  • System-level approach is best
  • Best gains (30-50%) with short loops. (<1000ft)
  • Vectoring is a short loop technology not suitable for CO deployments
  • ADTRAN knows vectoring.

In 2008, ADTRAN received the “Award for Outstanding Contributions to an ATIS Forum or Committee”. This achievement was in recognition for our initiative to provide the industry with a FEXT Channel Model needed for the analysis of FEXT cancellation techniques used in vectoring.

slide48

Thank You

Please visit: http://adtran.com to learn more.

Email info@adtran.com or call 800-9ADTRAN