VDSL FOR TRIPLE PLAY

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AN INTRODUCTION OF TRIPLE PLAY DEPLOYMENT USING VDSL

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VDSL FOR TRIPLE PLAY

  1. 1. VDSL forTriple Play Fernando Ramirez-Mireles, Ph.D.ramirezm@ieee.org, framirez@itam.mx 1 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  2. 2. Disclaimer• This presentation is being given for academic purposes only.• This talk provides information that is of public nature and can be found in the references and the WWW. We are not describing the capabilities of any commercial system in particular.• The presentation does not endorse the products of any company. We are not making any forward looking statement. 2 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  3. 3. Overview• A definition for VDSL (What?)• Penetration of VDSL (Who?)• VDSL for Triple-Play (Why?)• Anatomy of a VDSL system (How?)• The VDSL standard (How?)• Deployment of VDSL (How?)• Some VDSL-based applications (Where?)• The future … 3 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  4. 4. A dictionary definitionfor VDSL (modified from source: www.webopedia.com)• VDSL: Very High Speed DSL, transmits data in the 13-100 Mbps range over short distances, usually between 300 and 4500 feet (100 - 1500 meters), of twisted pair copper wire. The shorter the distance, the faster the connection rate.• DSL: Digital Subscriber Line, technology using sophisticated modulation schemes to pack data onto copper wires. They are sometimes referred to as last-mile technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations.• xDSL: Refers collectively to all types of DSL (VDSL, ADSL, SDSL, SHDSL, HDSL, ISDN) 4 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  5. 5. The shorter the distance,the faster the connection rate Modified from source : “DSL”, Chapter 15 in Internetworking Technology Overview, 100 5 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  6. 6. The larger the bandwidth,the faster the connection rate Modified from source: “Very-High-Speed Digital Subscriber Lines”, Cioffi etal., IEEE Commun. Magazine, VDSL PSD Mask 6 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  7. 7. Penetration of VDSL 7 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  8. 8. Broadband Acces Technologies Modified from source: OIDA NEWS, Vol. 12, Issue 3, 8 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  9. 9. Penetration of DSL Source: "DSL Anywhere" - Issue 2, DSL Forum 9 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  10. 10. VDSL in Korea 10 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  11. 11. VDSL for Triple-Play 11 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  12. 12. FSAN initiative based on VDSL Full Service Access Network: FSAN Telephone Voice Data data Data Video Video Audio Radio Television A T M VDSL Yesterday: 4 Services Today: 3 Tomorrow: 3 Tomorrow: 4 Services 3 Networks 4 Neworks 1 Networks Nework 12 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  13. 13. SOHO scenario for Triple-Play Dad Mom Kid Baby• Medical doctor with • Engineer • 15 years old • Crib with “DTV on private practice at telecommuting at Entrepreneur board” home home • Peer to peer on line • Monitoring from• One HDTV monitor • Teleconferencing gaming day care for telemedicine • Database consulting • Web surfing• One HDTV for with the office • One telephone line waiting room • One telephone line • One interactive• Database consulting HDTV for with the hospital entertainment• Two telephone lines 13 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  14. 14. Sample Requirements for Triple Play Applications Central office to Premises to Delay premises central office (Downstream) (Upstream) sensitivity3 HDTV Channels 40 Mbps 1 Mbps Low(MPEG2 12 Mbps each)1 DTV channel(4 Mbps)Data (VPN, internet) 10 Mbps 10 Mbps LowVideoconferencing 4 Mbps 4 Mbps HighOnline games 2 Mbps 2 Mbps HighVoIP (4 lines) 0.4 Mbps 0.4 Mbps HighTotal 56.4 Mbps 17.4 Mbps 14 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  15. 15. VDSL and ADSLTechnology DS/US Data Rate Reach Applications(bandwidth)VDSL2 50-100/50-100 Mbps 300 ft Symmetric: EFM, LRE(up to 30 MHz)VDSL1 50-100/20-30 Mbps 300 ft Asymmetric: multiple simultaneous HDTV’s and/or DTV’s, internet, audio,(12 MHz) 50/20 Mbps 1000 ft games, with POTS (plain old telephone 54/13 Mbps service) 26/26 Mbps 3000 ft 22/13 Mbps Others: High quality Video-conference, Tele-commuting, Tele-medicine, Distance- 13/13 Mbps 4500 ft learning, Home-shopping. 10/10 Mbps 6/6 Mbps 6000 ft 16/1 MbpsADSL2+ 20/0.8 Mbps 7200 ft Asymmetric: one HDTV or two simultaneous DTV’s, internet, audio,(up to 2.2 MHz) 10/0.8 Mbps 14400 ft games, with POTSADSL2 10/0.8 Mbps 14400 ft Asymmetric: one DTV, internet, audio, games, with POTS(1.1 MHz) 3.5/3.5 Mbps 10000 ft 15 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  16. 16. Other xDSL technologiesTechnology DS/US Data Rate Reach ApplicationsSHDSL 2.3/2.3 Mbps 16000 ft Symmetric: One or more T1/E1, data, remote LAN, with POTSHDSL-2 1.544/1.544 Mbps 9600 ft Symmetric: T1/E1 over one pair with no repeaters, no POTS 2.044/2.044 MbpsISDN 144/144 Kbps 14400 ft Symmetric: Digital voice plus dataT1/E1 over 1.544/1.544 Mbps 14400 ft or Symmetric: Data, no POTStwisted pair (leased line), uses two pairs 2.044/2.044 Mbps 12800 ft with repeaters every 1500(not a DSL) meters 16 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  17. 17. Anatomy of aVDSL SYSTEM 17 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  18. 18. Network topology for VDSL and POTS CO: Central CPE: Customers Office Premises Equipment US: Upstream backbone VDSL Internet WAN DSLAM DS: Downstream MODEM packet or cell VDSL VDSL based VDSL + POTSTwo networks Splitter Splitter (filter) (filter) Twisted Pair Voice "Last Mile" Voice "First Mile" backbone Phone PSTN Switch POTS: Analog Voice circuit POTS based POTS 18 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  19. 19. VDSL Transmission Environment voltaje diferencial Z_1 Z_2 impedancias con respecto a tierra 19 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  20. 20. Transmission Environment FDD: Freq. Division Duplexing Channel: Insertion Loss FDD: Freq. Division Duplexing Signal PSDSignal PSD (dBm/Hz) (dBm/Hz) Loss POTS (dB) POTS DS1 US1 DS2 US2 DS1 US1 DS2 US2 Frequency (MHZ) Frequency (MHZ) Frequency (MHZ) CO VDSL CPE VDSL MODEM + Channel + MODEM TX DS TX US Impairments: Noise and Interference (dBm/Hz) RX PSD Frequency (MHZ) 20 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  21. 21. Transmission environment Channel Noise Regulation & Impairments Impairments requirements• Insertion Loss • Crosstalk: • Spectrum – Next (f1.5) compatibility. – Legacy systems – Fext (|H(f)| d f ) 2 2• Bridge taps (BT) • RFI Ingress: • RFI Egress. – HAM Radio – HAM Radio – AM Radio • Upstream Power • Impulse Noise. Back-off 21 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  22. 22. Bridge TapChannelImpairments CO • Attenuation is a function of: – Length – Gauge – Frequency – Bridge taps 22 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  23. 23. Transmission environment Channel Noise Regulation & Impairments Impairments requirements• Insertion Loss • Crosstalk: • Spectrum – Next (f1.5) compatibility. – Legacy systems – Fext (|H(f)| d f ) 2 2• Bridge taps (BT) • RFI Ingress: • RFI Egress. – HAM Radio – HAM Radio – AM Radio • Upstream Power • Impulse Noise. Back-off 23 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  24. 24. Crosstalk Cable with several Twisted pairs Transmitter CO Modem Receiver Receiver Transmitter CO CPE/RT Modem Modem Transmitter Receiver NEXT: Near End Xtalk FEXT: Far End Xtalk Noise Received from Noise Received from Near Transmitter Far Transmitter 10s, 100s, 1000s feets 24 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  25. 25. Crosstalk (from a duplexing perspective) US US CO CPE/RTModem Modem DS DS STRONG FEXT into US US US CO CPE/RT NEXT into US FEXT into USModem Modem DS DS FEXT into DS NEXT into DS US US CO CPE/RTModem Modem DS DS Distance 25 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  26. 26. Sample Crosstalk PSDCrosstalk a function of:• Disturber’s PSD (Self: VDSL, Alien: ADSL, SHDSL, etc)• Frequency location and cable length and gauge• Cable type (wrapping and insulation inside the bundle) 26 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  27. 27. Radio Frequency Interference (RFI) RFI Ingress (from AM & HAM) RFI Egress (to HAM) AM HAMRadio Radio 27 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  28. 28. Electromagnetic Coupling of RFI Differential voltaje diferencial voltage Z_1 Z_2 Unbalance in Impedances with impedancias con respecto respect to ground a tierra 28 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  29. 29. Impulse Noise Sources of Impulse NoiseNature Domestic Industrial 29 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  30. 30. Impulse Noise 30VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  31. 31. Summary for Transmission Medium:(frequency, time and location dependant) 31 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  32. 32. Transmission environment Channel Noise Regulation & Impairments Impairments requirements• Insertion Loss • Crosstalk: • Spectrum – Next (f1.5) compatibility. – Legacy systems – Fext (|H(f)| d f ) 2 2• Bridge taps (BT) • RFI Ingress: • RFI Egress. – HAM Radio – HAM Radio – AM Radio • Upstream Power • Impulse Noise. Back-off 32 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  33. 33. Regulation in Medium Interface: • TX PSD: Conforms to a band plan: – FSAN 997,998, ITU FX (depends on standard and deployment) – Proprietary – Symmetric or asymmetric(VDSL1) 33 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  34. 34. Regulation in the transmission environment In-Band Signal PSD dictated by band Plan Signal PSD (dBm/Hz) Agregate RFI NOTCHES Power In-band Limit PSD Mask Mask US1 DS1 DS2 US2 Frequency (MHZ) freq. freq. freq. freq. freq. 1 2 3 4 5 Out-of-Band Signal PSD mandated by standard Signal PSD (dBm/Hz) SIDELOBESOut-of-band PSDa Mask PSDb US1 US2 Frequency (MHZ) Fa Fb Fc Fd 34 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  35. 35. Requirements in the Medium Interface:• Upstream power back-off at CPE/RT: alleviates near-far problem – Frequency dependant – Band plan, crosstalk composition, wire gauge and cable type of bundling. US US CO CPE/RT Modem Modem DS DSOther CO modems STRONG FEXT into US US US CO CPE/RT NEXT into US FEXT into US Modem Modem 35 DS VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire DS
  36. 36. The VDSL standard 36 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  37. 37. Standards bodiesANSI ETSI ITU IEEEWorking groups and industry associationsANSI T1E1.4 ETSI TM6 ITU Study IEEE EFM Group 15 Task Force 802.3.ahVDSL Alliance VDSL ADSL Forum FSAN(DMT) Coalition (SCM) ATM Forum 37 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  38. 38. VDSL standards• ANSI T1.E1 – Finalized in 2003, based on DMT “Discrete Multi Tone”• IEEE EFM 802.3ah – Finalized in 2003, based on DMT• ETSI TS 101 270-1&2 – Finalized in 2003, based on both DMT and SCM “Single Carrier Modulation”• ITU G993.1-2004 – VDSL1 finalized in 2004, based en DMT (SCM in annex)• ITU G993.2-2005 – VDSL2 specifications finalized in 2005, based on DMT 38 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  39. 39. System Architecture in the VDSL Standard 39 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  40. 40. System Architecture Transmitter Receiver• TPS-TC: Transport Transport : Transport : Protocol-Specific Data flow, Data flow, Transmission synchronization flow, synchronization flow, Convergence control flow, OAM flow control flow, OAM flow TPS-TC: TPS-TC:• OAM: Operation OAM, Multiplexing OAM, Demultiplexing And Maintenance asynchronous and VDSL asynchronous and• PMS-TC: Physical synchrounous channels Standard synchronous channels Medium-Specific PMS-TC: PMS-TC: Transmission Framing, Depends Frame synchronization Convergence Scarmbling Scrambling on De-Interleaving,FEC Decoder, FEC, Interleaving, De-Scrambling,De-Framing Line Code• FEC: Forward PMD: DMT PMD: Error Correction Data Encoding, or Synchronization,Equalization,• PMD: Physical Modulation SCM Demodulation, Data Decoding Duplexing De-Duplexing Medium Dependant Medium Interface: Medium Interface: TX PSD AGC• UPBO: Upstream UPBO Electrical requirements Power Back-off Electrical requirements Transmission Medium: Loop, Noise 40 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  41. 41. PMD layer for DMT• Actions in PMD’s Transmitter: – Data Encoding: Mapping bits to symbols – Modulation: Multicarrier QAM with bit loading – Duplexing: FDD• Actions in PMD’s Receiver: – Synchronization: Sampling frequency and symbol time – Equalization: TDQ in time and FEQ in frequency – Demodulation: QAM slicer – Data decoding:De-mapping symbol to bits – “De-Duplexing”: Digital de-duplexing using FFT 41 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  42. 42. DSP in PMS-TC + PMD + Medium Interface for DMT-VDSLslow Framing CRC Scrambling FEC Interleaving slow Near Transmitter Bit Extraction with Tone Ordering fast fast Framing CRC Scrambling FEC symbol tip IFFT Cyclic TX Line mapper DAC LPF Hybrid Extension Windowing Driver ring Slicer Remove tip RX LPF symbol FEQ FFT Cyclic TEQ ADC Hybrid Windowing demapper Extension ring slow de- CRC de- FEC de-slow Framing checksum Scrambling decoder Interleaving bit insertion with tone ordering de- CRC de- FECfast Framing checksum Scrambling decoder fast Far Receiver 42 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  43. 43. Training of the VDSL modem• Flexibility during training• Training signals allows training the modem – Synchronization, Equalization, Bit Loading• Training signals communicate parameters to allow configuration of modem during training – What frequency bands to use for US and DS – What PSD to use in each frequency band – Some parameters for system optimization (performance optimization, overhead reduction) – Enable optional features 43 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  44. 44. Training signals in DMT-VDSL ToneTone amplitudes at the receiver Amplitude Pilot tone Data carrier 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ............. (N/2)-1 Tone Index q• VDSL training signals and FSM allow configuration of features during training 44 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  45. 45. VDSLline codesDiscrete Multi-Tone (DMT):All international standards for ADSL, ADSL2, ADSL2+,VDSL1 and VDSL2 are based on DMTSingle Carrier Modulation:Two international standards for VDSL1 include SCM 45 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  46. 46. DMT and SCMMr. FEC DISCRETE MULTI TONE (Divide and Conquer) SINGLE CARRIER MODULATIONSignal PSD (dBm/Hz) Signal PSD (dBm/Hz) US1 DS1 US2 DS2 US3 US1 DS1 US2 DS2 US3 Frequenc Frequenc freq. freq. freq. freq. freq. freq. freq. freq. freq. freq. y y 1 2 3 4 5 1 2 3 4 5 (MHZ) (MHZ) 46 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  47. 47. DMT Processing 47 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  48. 48. SCM Processing 48 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  49. 49. Comparing DMT and SCMIssues Deleterious DMT solution SCM solution Advantages of effects DMT over SCMChannel Signal Equalization: Two simple Equalization: Simplicity inTime Smearing equalizers, one in time One complicated design andDispersion domain and one in equalizer in time implementation frequency domain domainFrequency Frequency Bit loading: Transmit No bit loading: Bandwidthdependent dependent more bits in frequency Transmit the efficiency andNoise signal-to- bands where there is less same average higher throughput noise ratio noise and less bits in number of bits in (SNR) frequency bands where every frequency there is more noise band regardless of amount of noise in each frequency bandFDD full Interference Signal separation: Use no Signal Higher spectrumduplex between filtering, utilize Fourier separation: Use utilization, higheroperation in upstream Transform orthogonality one complicated throughput andmulti-band and properties filter per flexiblespectrum downstream transmission implementation ofplans signals band different band plans 49 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  50. 50. Deployment of VDSL 50 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  51. 51. Deployment options Network topology Deployment architecture•VDSL and POTS •Direct deployment•Integrated Telephony •Fiber extensions•Multi-Services Platform 51 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  52. 52. Network topology for VDSL and POTS CO: Central CPE: Customers Office Premises Equipment US: Upstream backbone VDSL Internet WAN DSLAM DS: Downstream MODEM packet or cell VDSL VDSL based VDSL + POTSTwo networks Splitter Splitter (filter) (filter) Twisted Pair Voice "Last Mile" Voice "First Mile" backbone Phone PSTN Switch POTS: Analog Voice circuit POTS based POTS 52 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  53. 53. Network topology for integrated telephony CPE CO/Exchange/cabinet VDSL LIM VDSL VDSL backbone VDSL + POTS ONT splitter splitter VOICE VOICE 53 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  54. 54. Network topology for multi-services over VDSL “Multi-service” platform (DSL, voice, video, data) internet fiber Twisted pair WAN PSTN VDSL modem Gateway Video 54 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  55. 55. Deployment Architectures• Direct deployment – Distance < 4500 ft • CO/RT: Central Office/Remote Terminal• Fiber extensions – Distance < 4500 ft • FTTEx: Fiber to the Exchange • FTTCab: Fiber to the Cabinet – Distance < 900 ft • FTTCurb: Fiber to the Curb – Distance < 100 ft • FTTB: Fiber to the Building – MxUs: Multi-Tenant/Dwelling units 55 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  56. 56. Deployment with Fiber ExtensionsModified from source: ITU-T FS-VDSL FGTS Technical Specification, "Part 1: Operator requirements,“ Version 1.0.0 5 June 2002 < 4.5 Kft (1000 lines) (10-100 lines) < 4.5 Kft < 900 ft (10 lines) < 100 ftONU: Optical Network Unit (10 lines)OLT: Optical Line Termination 56 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  57. 57. VDSL and POTS: CO/RT D < 4500 ft; DS/US = 13/13 to 54/13 Mbps CABINET CO RT backbone D < 4500 ft VDSLInternet WAN DSLAM 100s, 1000s ft MODEM packet or cell VDSL VDSL based VDSL + POTS Splitter Splitter Voice Voice phone phone switch switch Bundle of Bundle of Twisted Pairs POTS Twisted Pairs 57 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  58. 58. VDSL and POTS:FTTX D < 4500 ft; DS/US = 13/13 to 54/13 MbpsFTTCab D < 4500 ft; DS/US = 13/13 to 54/13 MbpsFTTCurb D < 900 ft; DS/US = 50/20 to 100/30 Mbps cpe Exchange/Cabinet/ONU ONU D VDSL VDSL VDSL+VOICE VOICE VOICE 58 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  59. 59. VDSL and POTS:FTTB D < 100 ft; •DS/US = 100/50 Mbps for VDSL1 •DS/US = 100/100 Mbps for VDSL2 CPE ONU D < 100 ft VDSL VDSL VDSL + POTS VOICE VOICE Individual Twisted pairs 59 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  60. 60. Integrated Telephony: FTTX D < 4500 ft; DS/US = 13/13 to 54/13 Mbps FTTCab D < 4500 ft; DS/US = 13/13 to 54/13 Mbps FTTCurb D < 900 ft; DS/US = 50/20 to 100/30 MbpsCO/RT Exchange/Cabinet/ONU ONU cpe D < 900 ft VDSL VDSL VDSL + POTS VOICE VOICE 60 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  61. 61. Integrated Telephony: FTTB D < 100 ft; •DS/US = 100/50 Mbps for VDSL1 •DS/US = 100/100 Mbps for VDSL2 CPE ONU VDSL D < 100 ft LIMCO/RT VDSL VDSL fiber VDSL + VOICE ONT VOICE VOICE Individual Twisted pairs 61 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  62. 62. Multi-services platformFTTCurb D < 900 ft; •DS/US = 50/20 to 100/30 Mbps Premises Data Multi-services platform (DSL, voice, video, data) Gateway Voice D < 900 ft Video 62 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  63. 63. Applications• ATM/PTM over DSL (Symmetric/Asymmetric) – PTM less overhead than ATM for IP• EFM: Ethernet in the first mile (10BT)• LRFE: Long reach fast Ethernet (100BT) 63 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  64. 64. ATM/PTM over VDSL Transmitter Exchange Receiver CPE/RT CPE Transport: Transport: ATM or PTM ATM or PTM TPS-TC: TPS-TC:ATM-TC OR PTM-TC ATM-TC OR PTM-TC (fast and slow) (fast and slow) PMS-TC PMS-TC VDSL PHY PMD PMD Medium Interface Medium Interface Transmission Medium: 64 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  65. 65. Ethernet over VDSL CO Exchange CPE CPE/RT Ethernet MAC Ethernet MAC MII MII MII MII PTM-TC PTM-TC PMS-TC PMS-TC Ethernet VDSL Ethernet Phy Phy EthernetEthernet PHY PMD PMD port CoreNetwork Medium Medium Interface Interface Transmission Medium Transmission Medium (Twisted pair) Transmission Medium (LAN) 65 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  66. 66. The future …• Data rate for VDSL  SNRLOOP CodeGAIN  RVDSL ≈ BLoop log 2 1 +     SNRGAP NoiseMARGIN • VDSL.n? – Better coding techniques – Interference mitigation 66 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  67. 67. FERNANDO RAMIREZ-MIRELES ramirezm@ieee.org 67VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  68. 68. Abstract of the presentation• VDSL is the most powerful member of the xDSL family, capable to provide up to 100 Mbps on a single telephone wire. It provides unmatched flexibility in rate, reach and symmetry to satisfy the increasing demand for high-speed services such as corporate communications, fast internet access and high quality digital audio and video delivery.• This presentation will provide and introduction to the VDSL technology and its applications.• It will give an overview of a VDSL system, describing channel conditions, system architecture, and VDSL performance in terms of rate-reach- symmetry objectives.• It will cover the basic principles of VDSL, explaining why VDSL is not just an upgrade of ADSL in terms of higher transmission speed, and summarizing the features in the current VDSL standard that allow customization and on-the-fly configuration of the modems.• In particular, it will study a general block diagram of a DMT based VDSL modem, describing some of the signal processing techniques that enable this high performance operation and flexibility.• Finally, it will describe some of the applications for VDSL such as ATM over DSL and Ethernet over DSL. 68 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  69. 69. References• VDSL Standards, documents by ANSI, ETSI and ITU.• J. M. Cioffi et al., “Very-High-Speed Digital Subscriber Lines”, in IEEE Commun. Magazine.• P. Vetter et al., "Systems Aspects of APON/VDSL Deployment," IEEE Commun. Mag.• M Diaz Nava et. al., “A Short Overview of the VDSL System Requirements”, in IEEE Commun. Magazine.• Rich Wagner, “Broadband Access Network Options,” Corning Incorporated.• “Very-High_Data-Rate Digital Subscriber Line (VDSL)’, White paper, International Engineering Consortium, available at www.iec.org/online/tutorials/vdsl• “A VDSL Tutorial”, F. Sjöberg, Luleå Tekniska Universitet., available at http://epubl.luth.se/1402-1528/2000/02/LTU-FR-0002-SE.pdf• F. Ramirez-Mireles et. al., “The Benefits of Discrete Multi-Tone (DMT) Modulation for VDSL Systems”, White paper, www.analogzone.com• S. Hass, “Choose Wisely Between QAM and DMT for VDSL”,in Communications System Design.• “ADSL2 and ADSL+, The New Standards”, white paper, Aware Inc.• K. S. Jacobsen, “xDSL Technology and Applications: Removing the Telephone Line Bottleneck”, white paper, Texas Instruments, available at www.ewh.ieee.org/r6/scv/comsoc/9909.pdf 69 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire
  70. 70. About the authorFernando has over 10 years of experience inR&D in VDSL, UWB and speech processing.He has worked in the DSL field as a systemsand algorithms engineer. He is currently aprofessor in the engineering division at ITAM inMexico City. He has authored more thantwenty technical articles and has one patentgranted and two more pending. He is a seniormember of the IEEE. He can be reached atramirezm@ieee.org. 70 VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramire

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