Adtran, Inc. 2011 All rights reserved Slide 2 2 Adtran, Inc.
2011 A rights reserved Proprietary and Confidential Vectoring
De-mystified Market Drivers Understanding Vectoring Vectoring
Described Benefits of System-Level Implementation Slide 3 3 Adtran,
Inc. 2011 A rights reserved Proprietary and Confidential National
Goals by 2020: Ubiquitous 100Mbps Broadband Reaching 2020 Goal is
of National and Global Importance US: 100Mbps to 100 Million
households France: 100Mbps to 70% of subscribers Australia: 100
Mbps to 90% households Germany: 100Mbps to 50% of subscribers Slide
4 4 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential It impacts a countrys 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 Slide 5 5 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential And Drives Business Success Launched
in the last 6 years Super connected subscribers will lead to new
industries and companies we cant even imagine yet Higher bandwidth
results in more exciting applications which leads to increased
adoption and higher revenue per user Slide 6 6 Adtran, Inc. 2011 A
rights reserved Proprietary and Confidential 100Mbps+ Downstream:
25x faster than todays average 4Mbyte photo in 1/3 second A
complete album in 5 sec An Entire HD movie in less than 10 min
Multi-angle 3D HDTV Cloud based Multi- screen 3D Gaming. Slide 7 7
Adtran, Inc. 2011 A rights reserved Proprietary and Confidential
100Mbps: A Key Service Offering 100Mbps services will be mainstream
by 2015 Slide 8 8 Adtran, Inc. 2011 A rights reserved Proprietary
and Confidential 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 100Mbps: A Key Service Offering
Slide 9 9 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential 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 Lets see
how Slide 10 10 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential Vectoring De-mystified Market Drivers Understanding
Vectoring Vectoring Described Benefits of System-Level
Implementation Slide 11 11 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential 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)
Slide 12 12 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential 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). Two bits Three bits Four
bits Slide 13 13 Adtran, Inc. 2011 A rights reserved Proprietary
and Confidential What Is Crosstalk? DSL2 DSL1 DSL2 FEXT Coupling
DSL2 DSL1 DSL2 NEXT Coupling Slide 14 14 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential ANSI Crosstalk Noise Models
Slide 15 15 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential 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 Slide 16 16 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential ADSL2+ 11 Bit Constellation Slide 17
17 Adtran, Inc. 2011 A rights reserved Proprietary and Confidential
What is Vectoring? +FEXT -FEXT +FEXT Slide 18 18 Adtran, Inc. 2011
A rights reserved Proprietary and Confidential G.Vector ITU
Recommendation G.993.5 Slide 19 19 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential Why Vector Profile 17 Instead
of Using Profile 30? Slide 20 20 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential Why Vector Profile 17 Instead
of Profile 30? Slide 21 21 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential Vectoring De-mystified Market Drivers
Understanding Vectoring Vectoring Described Benefits of
System-Level Implementation Slide 22 22 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential 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 Slide 23 23 Adtran,
Inc. 2011 A rights reserved Proprietary and Confidential Aligned
Synch Symbols Enable Training Down Synch 1 DMT 2 DMT 3 DMT 4 time
Down Synch 1 DMT 2 DMT 3 DMT 4 time Down Synch 1 DMT 2 DMT 3 DMT 4
time DMT 1 DMT 2 DMT 3 Up Synch 4 time DMT 1 DMT 2 DMT 3 Up Synch 4
time DMT 1 DMT 2 DMT 3 Up Synch 4 time Downstream Ports Upstream
Ports Down Synch 1 time Up Synch 4 time New Port Slide 24 24
Adtran, Inc. 2011 A rights reserved Proprietary and Confidential
Estimating the Crosstalk. The CPE reports the slicer error measured
on the synch symbols and sends it back to the DSLAM Slide 25 25
Adtran, Inc. 2011 A rights reserved Proprietary and Confidential
DSL Transceivers EncoderFramer EncoderFramer EncoderFramer
EncoderFramer Modulator DSL Transceiver Slide 26 26 Adtran, Inc.
2011 A rights reserved Proprietary and Confidential G.993.5:
G.vector EncoderFramerModulator EncoderFramerModulator
EncoderFramerModulator EncoderFramerModulator Vector Control Entity
Precoder Slide 27 27 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential G.993.5: G.vector
EncoderFramerModulator EncoderFramerModulator
EncoderFramerModulator EncoderFramerModulator Vector Control Entity
Precoder EncoderFramer Modulator EncoderFramer Modulator
EncoderFramer Modulator EncoderFramer Modulator Vector Control
Entity Precoder DSL Modem Slide 28 28 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential G.vector: Vector Control
Entity (VCE) FramerModulator FramerModulator FramerModulator
FramerModulator Vector Control Entity Precoder DSL Modem Vector
Control Entity (VCE): coordinates initialization of DSL links:
orderly join/leave process Encoder Slide 29 29 Adtran, Inc. 2011 A
rights reserved Proprietary and Confidential G.Vector Steady State
Operation 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
EncoderFramerModulatorPrecoder EncoderFramerModulatorPrecoder
EncoderFramerModulatorPrecoder Data SyncData SyncData SyncData
Encoder DSL Modem Slide 30 30 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential G.vector: Adding a Line 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
EncoderFramerModulatorPrecoder EncoderFramerModulatorPrecoder
EncoderFramerModulatorPrecoder EncoderFramerModulatorPrecoder Data
SyncData SyncData SyncData SyncData Encoder DSL Modem Joining Modem
DSL Modem Slide 31 31 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential Board Level FEXT Cancellation (across
DSPs and VCE) DSP 1 DSP 2 DSP 3 DSP 4 Cable Plant Slide 32 32
ADTRAN 2010 All rights reserved Background on Binders Binder 1
Binder 2Binder 3 New line cards or additional systems added No 1 to
1 correlation between systems and binders Slide 33 33 ADTRAN 2010
All rights reserved The Problem with Vectoring Some Pairs Cannot be
part of the Team Crosstalk (FEXT) Pairs in the same binder need to
be handled as a single group to effectively implement vectoring
Slide 34 34 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential Deployment Strategy FEXT Cancellation = Binder
Management Slide 35 35 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential Measured Results: Downstream 12 13
Binder Vectoring: 24 (Left) Vectored + 24 (Right) unvectored Cable
Vectoring: 48 lines (24L (rates shown) + 24R) in one vector group
Slide 36 36 Adtran, Inc. 2011 A rights reserved Proprietary and
Confidential Measured Results: Upstream 12 13 Binder Vectoring: 24
(Left) Vectored + 24 (Right) unvectored Cable Vectoring: 48 lines
(24L (rates shown) + 24R) in one vector group Slide 37 37 Adtran,
Inc. 2011 A rights reserved Proprietary and Confidential Vectoring
De-mystified Market Drivers Understanding Vectoring Crosstalk,
Bonding and Binder Management Vectoring Described Benefits of
System- Level Implementation Slide 38 38 Adtran, Inc. 2011 A rights
reserved Proprietary and Confidential System Level FEXT
Cancellation DSP 1 DSP 2 DSP 3 DSP 4 Cable Plant DSP 1 DSP 2 DSP 3
DSP 4 Cable Plant DSP 1 DSP 2 DSP 3 DSP 4 Cable Plant Slide 39 39
ADTRAN 2010 All rights reserved The Solution is a System Approach
Letting Everyone Join the Team Crosstalk (FEXT) 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
Slide 40 40 ADTRAN 2010 All rights reserved Board Level to System
Level Upgradeability DSL Modem Binder Card 1 DSL Modem Card 2
Resource Card 3 Card 4 4 Cards = 192 Ports 3 Cards = 144 Ports 2
Cards = 96 Ports 1 Cards = 48 Ports Slide 41 41 ADTRAN 2010 All
rights reserved OSP Board Level to System Level Upgradeability DSL
Modem Binder DSL Modem System level vectoring OSPs DSL Modem
Initially Single OSP has internal BLV Slide 42 42 Adtran, Inc. 2011
A rights reserved Proprietary and Confidential FEXT Cancelled Group
96 Pairs No Alien Disturbers Slide 43 43 ADTRAN 2010 All rights
reserved Vectoring Benefits and Considerations Vectoring has the
potential to cancel crosstalk in a binder: All users see rates as
if they were the only user 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 26
AWG equivalent: Multiply vectored reach by 1.3 for 24 AWG 100 Mbps
to > 2500 ft, Using 2 pairs Slide 44 44 ADTRAN 2010 All rights
reserved Downstream Performance Full Cancellation Slide 45 45
ADTRAN 2010 All rights reserved Upstream Performance Full
Cancellation Slide 46 46 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential 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 Slide 47 47 Adtran, Inc. 2011 A rights reserved
Proprietary and Confidential Key Takeaways System-level approach is
best Best gains (30-50%) with short loops. (
