Reinventing DSL with Copper Pair Bonding

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1 Reinventing DSL with Copper Pair Bonding Wednesday, October 26 1:30 3:00 p.m. Venetian Ballroom I Technology Forum at TELECOM 05

2 Reinventing DSL with Copper Bonding ATIS Technology Conference Telecom 05 October 26, 2005

3 Reinventing DSL: Higher Speeds Competition Cable 3G Wireless Migration From 1.5 Mbps to 15 Mbps or more Standards Need cost-effective, standard solutions

4 Inverse Multiplexing Payload Bonding Bonding Defined Combining the payloads of 2 or more DSL links into a single fat pipe Many Standards available MLPPP (RFC 1990) relies on underlying HDLC IMA Inverse Multiplexing for ATM T1.427, G /.1: ATM Cell Bonding.02/.2: Ethernet Transport (64/65 TC).03/.3: Time Division Inverse Multiplexing (TDIM) IEEE 802.3ah Ethernet bonding with SHDSL/VDSL

5 What Bonding with What DSL? MLPPP IMA TDIM 64/65 Ethernet Bonding ATM Bonding Theoretically, any bonding works with any DSL DS-1 SHDSL VDSL1/2 ADSL/ ADSL2+

6 What Bonding with What DSL? MLPPP IMA TDIM 64/65 Ethernet Bonding ATM Bonding DS-1 SHDSL VDSL1/2 ADSL/ ADSL2+ In practice, these mappings are the most common

7 Beyond Standards Multiple Input Multiple Output (MIMO) Can be applied mostly independent of payload bonding method Rates can be boosted through In-Domain Crosstalk Cancellation Out-of-Domain Crosstalk Compensation Pair-diverse Coding Out of domain gains can vary widely Most gain requires large (8-12 pairs) group size Depends on # and type of other system and noise

8 Panelists Jürgen Lison, Alcatel Bonding and ADSL2+ Rouben Toumani, Ikanos Bonding and VDSL2 Gary Tennyson, BellSouth Bonding Deployment Considerations

9 Reinventing DSL with Bonding Jürgen Lison, Alcatel All rights reserved 2005, Alcatel

10 Topics Why bond? Capture new customers with extended reach Address business needs with symmetrical services Offer triple play services Shannon s Law and market realities Bonded ADSL2+ fills the gaps Bonding challenges and solutions Summary Reinventing DSL USTA 2005 Page 2 All rights reserved 2005, Alcatel

11 How some people bond lines Key features: Poor scalability High fixed investment costs Safety concerns And not very flexible Reinventing DSL USTA 2005 Page 3 All rights reserved 2005, Alcatel

12 Why Bond ADSL2+? At any REACH Double RATE (DS, US) Generally Available and shipping TODAY Stable, standard technology Chip synergies with legacy ADSL Greater range of marketable bandwidths than single pair VDSL/VDSL2 Reinventing DSL USTA 2005 Page 4 All rights reserved 2005, Alcatel

13 Expanding the customer (and revenue) base for DSL Extending Reach Bonded ADSL2+ doubles data rates at any given reach Customers previously unable to qualify for DSL now qualify Symmetrical Services Double upstream bandwidth T1 replacement opportunity Target SMB customers Competitive positioning over cable Reinventing DSL USTA 2005 Page 5 All rights reserved 2005, Alcatel

14 Delivering the Triple Play Reinventing DSL USTA 2005 Page 6 All rights reserved 2005, Alcatel

15 How much bandwidth is needed at the home? Depends on the services offered Video High bandwidth and high QOS HD and SD Multiple STBs, DVRs, and PIPs Voice Low bandwidth but high QOS Data High bandwidth but bursty Some QoS Supply-side product: If you build it, they will come Mbps 40 Mbps 20 Mbps HSI HD DVR 2 HSI Tier 2 Table Stakes HSI Tier 1 SD SD HD Still More Data SD TV 3 Triple Play Market More Data Data DVR 1 TV 2 TV 1 Reinventing DSL USTA 2005 Page 7 All rights reserved 2005, Alcatel

16 IPTV and interactivity IPTV drives interactive services Multiple Picture-in-picture streams Online gaming Video on Demand Services drive more bandwidth Multiple HD streams Quick response video games Competition drives more bandwidth Cable is and will continue to differentiate on perceived data bandwidth Order Print ^ The market requires an access network transformation Reinventing DSL USTA 2005 Page 8 All rights reserved 2005, Alcatel

17 Single Pair ADSL or ADSL2+ won t deliver the Triple Play Better data rates are possible FTTC FTTN ADSL2+ Basic video can be delivered, but HDTV and any cable competition hurts marketability DLC loop lengths are not IPTV-enabled with ADSL2+ Data Rate (Mbps) Triple Play Market ADSL Triple Play Bandwidth ,000 2,000 3,000 4,000 5,000 6,000 Loop Length (ft) Reinventing DSL USTA 2005 Page 9 All rights reserved 2005, Alcatel

18 VDSL2 is one solution Enables complete triple play over copper FTTC FTTN VDSL2 ADSL2+ Simple approach: One pair Easy management New technology Economics of scale Higher impact from interference Data Rate (Mbps) Triple Play Market ADSL Triple Play Bandwidth 0 0 1,000 2,000 3,000 4,000 5,000 6,000 Loop Length (ft) Reinventing DSL USTA 2005 Page 10 All rights reserved 2005, Alcatel

19 Bonded ADSL2+ transforms the copper access plant Provides the widest range of options for Triple Play Synergies with existing ADSL Chipsets Power profile Complexities Multiple pairs not available everywhere Managing data across two pairs B/OSS issues to be resolved Data Rate (Mbps) FTTC FTTN Triple Play Market 0 1,000 2,000 3,000 4,000 5,000 6,000 Loop Length (ft) VDSL2 Bonded ADSL2+ ADSL2+ ADSL Triple Play Bandwidth Reinventing DSL USTA 2005 Page 11 All rights reserved 2005, Alcatel

20 Execution presents challenges that have solutions! Challenges Finding additional copper pair between subscriber and DSLAM Solutions Most homes have two pair for legacy POTS requirements System level bonding eliminates DSLAM rewiring: use the next pair, regardless of position New Bonding-ready CPE required OSS systems not currently supporting bonding IPTV: New CPE will be required regardless ERDSL: New customers need CPE OSS is already designed to support two lines per customers Element management tools enable efficient bonding management within current operations practices and systems Reinventing DSL USTA 2005 Page 12 All rights reserved 2005, Alcatel

21 Integrated bonding with service provider s NMS/OSS systems Operations procedures are the SAME as currently employed TL1 upstream interface for flow through provisioning, performance monitoring, and alarm surveillance Tools to examine equipment inventory and customer status Easy to use GUI for troubleshooting, and maintenance purposes Simplicity of system-level bonding OSS does not have to worry about which two lines to pair Any line to any line capability Integration into existing element management Reinventing DSL USTA 2005 Page 13 All rights reserved 2005, Alcatel

22 Summary Bonding Copper Pairs Enables triple play services over copper and node/curb distances Provides means to expand residential DSL customer base Allows competitive SMB service offerings Operational challenges have clear solutions All of this is available TODAY Reinventing DSL USTA 2005 Page 14 All rights reserved 2005, Alcatel

23 Reinventing DSL USTA 2005 Page 15 All rights reserved 2005, Alcatel

24 Reinventing DSL: Delivering 25Mbps & Beyond Over Existing Copper Pairs Rouben Toumani, PhD. Ikanos Communications Ikanos Confidential

25 Overview» The copper access network is evolving driven by new applications and services» DSL technologies have evolved to meet the need ADSL -> ADSL2+ -> VDSL -> VDSL2 VDSL2 has emerged as a universal DSL technology to serve multiple deployment options in the access network From Dial-up to Fiber-Fast Broadband Performance From FTTP to Exchange-Based distances» Promising new technologies on the horizon Bonding of two or more pairs of copper Great performance enhancement with existing technologies Applies to multiple physical layers (ADSL to VDSL2) Dynamic Spectrum Management (DSM) Noise cancellation techniques (MIMO) Dynamic Noise Management 2 Ikanos Confidential

26 Fiber/Copper Deployment Scenarios Central Office FTTB 1Kft Node MxU, FTTN Mbps Remote <1Mile 1-22 Miles CO, RT Mbps >2 Miles 3 Ikanos Confidential FTTH

27 Telco Access Evolution 30 MHz 100M/100M, 25M/5M VDSL, VDSL2 Broadband 2.2 MHz Interactive Broadband Triple-Play + 25M/2M 8M/800K 4 khz 1.1 MHz Gen 1 (ADSL) Broadband Gen 2 (ADSL2+) Broadband Streaming audio and video Enhanced peer-peer sharing 56K/28K Narrowband Dialup Enhanced web access Streaming audio Basic web access Ikanos Confidential

28 Interactive Broadband: The Next Wave Media-rich, Multi-player Gaming 12 Mbps/channel HDTV Interactive Features, Personalized Services Wideband VoIP 4 Mbps bi-directional 4x-10x Faster Web Access, Remote Access of Home PC Enhanced Video + Audio, Video Surveillance Video Blogging, Video Upload, Digital Photo Upload 5 Ikanos Confidential

29 VDSL2: The Universal DSL Technology» Cost-effective fiber bandwidth over copper Capability to deliver 100 Mbps symmetric services Supports triple-play Supports interactive services (enhanced upstream) Designed for integration with IP packet based networks» Built on solid, proven DMT technology 100 Million lines and counting! Seamless multi-mode (ADSL/ADSL2/ADSL2+/VDSL/VDSL2)» Key technology enhancements Wider spectrum utilization up to 30 MHz Trellis Coded Modulation (TCM) Deployment-optimized implementations: Profiles PSD shaping for co-existence with the deployed services Optional U0 band expanded to 276 khz for long reach 6 Ikanos Confidential

30 Technology Enhancements Bonded VDSL2» VDSL2 Copper Pair Bonding Standards (ITU-T G.998 / ATIS T1.427 series) compliant Packet (Ethernet): Seamless integration into IP based networks Also ATM for legacy networks and TDIM for DS3 transport Data aggregation protocol above the Physical Layer Offers greatest flexibility / optimized implementations» Market Drivers for Bonded VDSL2 Ensure ubiquitous service offering / geographic footprint Commercial MTU s, Residential MDU s Business: High reliability, guaranteed symmetric rates Avoids copper ownership / building access issues Single Family Residential Consumer: Offer the highest broadband rates available Perfect for deep fiber / PON network architectures 7 Ikanos Confidential

31 Bonding 2 pairs of VDSL VDSL2 Profile 12a 12 self-disturbers (99% worst case) 24 AWG Mbps ,000 2,000 3,000 4,000 5,000 6,000 Loop Length (feet) Downstream Downstream (2 pairs bonded) Upstream Upstream (2 pairs bonded) 8 Ikanos Confidential

32 Technology Enhancements: DSM (Dynamic Spectrum Management)» Four Levels of DSM Level 0: Nothing hogs the available wire line spectrum In use today: Spectrum Management Rules (T1.417) Systems shall not cause each other significant degradation Level 1: Politeness = Near transmitter speaks softly Transmits only the power needed for service offering Especially useful for near-far problem Level 2: Spectrum Balancing Adaptively determines PSDMASK Shorter loop uses higher frequencies with less penalty Level 3: Vectoring = Intelligent Service Provider Network Active management of both CO and CPE modems Serious number crunching gains serious performance 9 Ikanos Confidential

33 Technology Enhancements: MIMO (Multiple Input Multiple Output)» Technology used in wireless networks» Now being introduced for copper bonded systems Intra-network transport (Cell site backhaul, T1/T3 gap) 12+ pairs bonded in end-to-end system, vector managed» The ultimate Level 3 DSM Vectoring = true mitigation of NEXT and FEXT crosstalk MIMO NEXT mitigation: US is easier Co-located receivers seeking common enemy exploits the alien crosstalk correlation across lines Useful to create greater rate symmetry (better US) DS more complex: Must use transmitter pre-compensation Pre-comp is based on data of varying accuracy 10 Ikanos Confidential

34 Summary» Drivers of copper access network evolution include: Triple Play / HDTV delivery Peer-to-peer applications requiring greater upstream» DSL technologies have evolved to meet the need Bonding provides additional coverage DSM & MIMO: active noise mitigation is the next step» VDSL2: VDSL2 has arrived as the universal DSL technology Ready to implement future technology enhancements 11 Ikanos Confidential

35 Reinventing DSL with Copper Pair Bonding October 26, Gary Tennyson BellSouth Telecommunications

36 Building a Competitive Broadband Network New distribution areas Fiber To The Curb (FTTC) Base of existing distribution areas Fiber To The Node (FTTN) Both drive fiber deeper into the loop network 2

37 Fiber To The Curb Telephony and DSL service is supported, not an overlay Fiber placed throughout a serving area as it is developed Optical Network Units (ONU) provide for conversion from an optical to an electrical interface Maximum Distance from ONU to a subscriber s residence/business is 500 feet Short drop allows us to take advantage of the very high data rates offered by VDSL 3

38 Fiber To The Node New platforms will support the existing base of DSL lines Large existing base of remote DSLAM s could create a complex spectrum management problem in an overlay network Multi-mode ports to support existing DSL Initial focus on ADSL2plus Planning to use VDSL2 as we move forward Bonding 4

39 What is Bonding? Provides for summing the capacity of two or more DSL lines Involves multiple physical-layer transceivers One data stream seen by the user Provides for greater data rates and/or operation on longer loops Needed with ADSL2plus for data rates greater than about Mbps in a multipair environment Not unique to ADSL2plus 5

40 Why Choose Bonded DSL? Decision requires insight into several areas: DSL Rate/Reach Distribution of loop lengths Availability of vacant pairs What is the targeted maximum data rate? What is the targeted coverage, i.e., what percent of loops should be capable of supporting the targeted data rate? 6

41 DSL Reach Depends on the Targeted Data Rate Need to consider different disturber types Repeatered T1, for example Self-FEXT not typically seen as a limiting factor at lower data rate and frequencies; more impact at higher data rates and frequencies Existing DSL transferred to new platform common launch level Bridge Taps Gauge coarse gauge may not provide the improvement that you would expect 7

42 8 Distribution of Loop Lengths

43 Loop Reach Impacts Costs Shorter loop reach => More nodes Per site costs Cabinets Power Interconnection Easement costs Are interconnection points available? Existing DLC RT s power, pad, and interconnection are available Existing FDI s interconnection is available Re-sectionalized plant Bonding provides tradeoff between pair availability and the number of nodes 9

44 Planning Considerations Unequal data rates Two DSL s cannot simultaneously be experiencing the worst-case crosstalk Bonding will support unequal data rates to take advantage of this Are vacant pairs available in the serving terminals? Two lines are needed from the DSLAM to the CPE modem New drop will often be needed (buried/aerial) New Inside Wire may be needed Truck roll 10

45 Operational Considerations System-wide bonding vs. card-level bonding System-wide bonding allows bonding of a new line to an existing line without a transfer Card-level bonding can require a transfer The second line may not have an underlying POTS line Loop testing without a telephone number? Sealing Current? Bonding-capable CPE is required 11

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