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VDSL FOR TRIPLE PLAY

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VDSL for Triple Play
Copyright 2010 Fernando Ramirez-Mireles
ramirezm@ieee.org, framirez@itam.mx
1
Fernando Ramirez-Mirele...

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VDSL for Triple Play
Copyright 2010 Fernando Ramirez-Mireles
ramirezm@ieee.org, framirez@itam.mx
2
• This presentation is ...

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VDSL for Triple Play
Copyright 2010 Fernando Ramirez-Mireles
ramirezm@ieee.org, framirez@itam.mx
3
• A definition for VDSL...

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VDSL FOR TRIPLE PLAY

  1. 1. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 1 Fernando Ramirez-Mireles, Ph.D. ramirezm@ieee.org, framirez@itam.mx VDSL for Triple Play
  2. 2. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 2 • 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. Disclaimer
  3. 3. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 3 • 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 … Overview
  4. 4. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 4 (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) A dictionary definition for VDSL
  5. 5. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 5 The shorter the distance, the faster the connection rate Modified from source : “DSL”, Chapter 15 in Internetworking Technology Overview, 100
  6. 6. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 6 Modified from source: “Very-High-Speed Digital Subscriber Lines”, Cioffi etal., IEEE Commun. Magazine, The larger the bandwidth, the faster the connection rate VDSL PSD Mask
  7. 7. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 7 Penetration of VDSL
  8. 8. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 8 Broadband Acces Technologies Modified from source: OIDA NEWS, Vol. 12, Issue 3,
  9. 9. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 9 Penetration of DSL Source: "DSL Anywhere" - Issue 2, DSL Forum
  10. 10. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 10 VDSL in Korea
  11. 11. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 11 VDSL for Triple-Play
  12. 12. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 12 Full Service Access Network: FSAN initiative based on VDSL Data Television Telephone 4 Services 4 Neworks 4 Services 1 Nework Radio FSAN Voice Data Video Audio Today: Tomorrow: A T M 3 3 3 Video Yesterday: Tomorrow: data Networks Networks VDSL
  13. 13. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 13 SOHO scenario for Triple-Play Dad • Medical doctor with private practice at home • One HDTV monitor for telemedicine • One HDTV for waiting room • Database consulting with the hospital • Two telephone lines Mom • Engineer telecommuting at home • Teleconferencing • Database consulting with the office • One telephone line Kid • 15 years old Entrepreneur • Peer to peer on line gaming • Web surfing • One telephone line • One interactive HDTV for entertainment Baby • Crib with “DTV on board” • Monitoring from day care
  14. 14. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 14 Sample Requirements for Triple Play Applications Central office to premises (Downstream) Premises to central office (Upstream) Delay sensitivity 3 HDTV Channels (MPEG2 12 Mbps each) 1 DTV channel (4 Mbps) 40 Mbps 1 Mbps Low Data (VPN, internet) 10 Mbps 10 Mbps Low Videoconferencing 4 Mbps 4 Mbps High Online games 2 Mbps 2 Mbps High VoIP (4 lines) 0.4 Mbps 0.4 Mbps High Total 56.4 Mbps 17.4 Mbps
  15. 15. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 15 Technology (bandwidth) DS/US Data Rate Reach Applications VDSL2 (up to 30 MHz) 50-100/50-100 Mbps 300 ft Symmetric: EFM, LRE VDSL1 (12 MHz) 50-100/20-30 Mbps 50/20 Mbps 54/13 Mbps 26/26 Mbps 22/13 Mbps 13/13 Mbps 10/10 Mbps 6/6 Mbps 16/1 Mbps 300 ft 1000 ft 3000 ft 4500 ft 6000 ft Asymmetric: multiple simultaneous HDTV’s and/or DTV’s, internet, audio, games, with POTS (plain old telephone service) Others: High quality Video-conference, Tele-commuting, Tele-medicine, Distance- learning, Home-shopping. ADSL2+ (up to 2.2 MHz) 20/0.8 Mbps 10/0.8 Mbps 7200 ft 14400 ft Asymmetric: one HDTV or two simultaneous DTV’s, internet, audio, games, with POTS ADSL2 (1.1 MHz) 10/0.8 Mbps 3.5/3.5 Mbps 14400 ft 10000 ft Asymmetric: one DTV, internet, audio, games, with POTS VDSL and ADSL
  16. 16. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 16 Technology DS/US Data Rate Reach Applications SHDSL 2.3/2.3 Mbps 16000 ft Symmetric: One or more T1/E1, data, remote LAN, with POTS HDSL-2 1.544/1.544 Mbps 2.044/2.044 Mbps 9600 ft Symmetric: T1/E1 over one pair with no repeaters, no POTS ISDN 144/144 Kbps 14400 ft Symmetric: Digital voice plus data T1/E1 over twisted pair (not a DSL) 1.544/1.544 Mbps 2.044/2.044 Mbps 14400 ft or 12800 ft Symmetric: Data, no POTS (leased line), uses two pairs with repeaters every 1500 meters Other xDSL technologies
  17. 17. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 17 Anatomy of a VDSL SYSTEM
  18. 18. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 18 Network topology for VDSL and POTS VDSL MODEM Phone Switch Internet DSLAM Splitter Splitter WAN PSTN Twisted Pair "Last Mile" "First Mile" backbone backbone packet or cell based circuit based CO: Central Office CPE: Customer's Premises Equipment POTS POTS DS: Downstream US: Upstream VDSL VDSL Voice Voice VDSL + POTS POTS: Analog Voice (filter) (filter) Two networks
  19. 19. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 19 VDSL Transmission Environment Z_2 Z_1 voltaje diferencial impedancias con respecto a tierra
  20. 20. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 20 Transmission Environment CO VDSL MODEM Channel Loss (dB) Frequency (MHZ) Channel: Insertion Loss CPE VDSL MODEM + + DS1 US1 DS2 US2 Signal PSD (dBm/Hz) Frequency (MHZ) FDD: Freq. Division Duplexing TX DS DS1 US1 DS2 US2 Signal PSD (dBm/Hz) Frequency (MHZ) FDD: Freq. Division Duplexing TX US RX PSD (dBm/Hz) Frequency (MHZ) Impairments: Noise and Interference POTS POTS
  21. 21. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 21 Transmission environment • Crosstalk: – Next (f1.5) – Fext (|H(f)|2 d f2) • RFI Ingress: – HAM Radio – AM Radio • Impulse Noise. Regulation & requirements • Spectrum compatibility. – Legacy systems • RFI Egress. – HAM Radio • Upstream Power Back-off Noise Impairments Channel Impairments • Insertion Loss • Bridge taps (BT)
  22. 22. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 22 Channel Impairments • Attenuation is a function of: – Length – Gauge – Frequency – Bridge taps Bridge Tap CO
  23. 23. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 23 Transmission environment • Crosstalk: – Next (f1.5) – Fext (|H(f)|2 d f2) • RFI Ingress: – HAM Radio – AM Radio • Impulse Noise. Noise Impairments Channel Impairments • Insertion Loss • Bridge taps (BT) Regulation & requirements • Spectrum compatibility. – Legacy systems • RFI Egress. – HAM Radio • Upstream Power Back-off
  24. 24. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 24 Crosstalk Transmitter Receiver CO Modem Receiver Transmitter CPE/RT Modem Transmitter Receiver CO Modem Noise Received from Near Transmitter Noise Received from Far Transmitter NEXT: Near End Xtalk FEXT: Far End Xtalk 10's, 100's, 1000's feets Cable with several Twisted pairs
  25. 25. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 25 Crosstalk (from a duplexing perspective) CO Modem CPE/RT Modem CO Modem CPE/RT Modem US DS US DS US DS US DS CO Modem CPE/RT Modem US DS US DS NEXT into US FEXT into US FEXT into DS NEXT into DS STRONG FEXT into US Distance
  26. 26. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 26 Sample Crosstalk PSD Crosstalk a function of: • Disturber’s PSD (Self: VDSL, Alien: ADSL, SHDSL, etc) • Frequency location and cable length • Cable type (wrapping and insulation inside the bundle) and gauge
  27. 27. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 27 Radio Frequency Interference (RFI) RFI Ingress (from AM & HAM) RFI Egress (to HAM) AM Radio HAM Radio
  28. 28. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 28 Electromagnetic Coupling of RFI Z_2 Z_1 voltaje diferencial impedancias con respecto a tierra Differential voltage Unbalance in Impedances with respect to ground
  29. 29. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 29 Impulse Noise Nature Domestic Industrial Sources of Impulse Noise
  30. 30. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 30 Impulse Noise
  31. 31. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 31 (frequency, time and location dependant) Summary for Transmission Medium:
  32. 32. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 32 Transmission environment • Crosstalk: – Next (f1.5) – Fext (|H(f)|2 d f2) • RFI Ingress: – HAM Radio – AM Radio • Impulse Noise. Noise Impairments Channel Impairments • Insertion Loss • Bridge taps (BT) Regulation & requirements • Spectrum compatibility. – Legacy systems • RFI Egress. – HAM Radio • Upstream Power Back-off
  33. 33. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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)
  34. 34. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 34 Regulation in the transmission environment DS1 US1 DS2 US2 Signal PSD (dBm/Hz) Frequency (MHZ) Limit PSD Mask freq. 1 freq. 2 freq. 3 freq. 4 freq. 5 RFI NOTCHES Agregate Power In-Band Signal PSD dictated by band Plan US1 US2 Signal PSD (dBm/Hz) Frequency (MHZ) PSDa Fa Fb Fc Fd SIDELOBES Out-of-Band Signal PSD mandated by standard PSDb In-band Mask Out-of-band Mask
  35. 35. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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. CO Modem CPE/RT Modem CO Modem CPE/RT Modem US DS US DS US DS US DS NEXT into US FEXT into US STRONG FEXT into US Other CO modems
  36. 36. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 36 The VDSL standard
  37. 37. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 37 ANSI ETSI ITU IEEE Working groups and industry associations ANSI T1E1.4 ETSI TM6 ITU Study Group 15 IEEE EFM Task Force 802.3.ah VDSL Alliance (DMT) VDSL Coalition (SCM) ADSL Forum ATM Forum FSAN Standards bodies
  38. 38. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 38 • 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 VDSL standards
  39. 39. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 39 System Architecture in the VDSL Standard
  40. 40. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 40 System Architecture • TPS-TC: Transport Protocol-Specific Transmission Convergence • OAM: Operation And Maintenance • PMS-TC: Physical Medium-Specific Transmission Convergence • FEC: Forward Error Correction • PMD: Physical Medium Dependant • UPBO: Upstream Power Back-off TPS-TC: OAM, Multiplexing asynchronous and synchrounous channels Transmission Medium: Loop, Noise PMS-TC: Framing, Scarmbling FEC, Interleaving, PMD: Data Encoding, Modulation Duplexing Transport : Data flow, synchronization flow, control flow, OAM flow TPS-TC: OAM, Demultiplexing asynchronous and synchronous channels PMS-TC: Frame synchronization De-Interleaving,FEC Decoder, De-Scrambling,De-Framing PMD: Synchronization,Equalization, Demodulation, Data Decoding De-Duplexing Transport : Data flow, synchronization flow, control flow, OAM flow Transmitter Receiver Medium Interface: TX PSD UPBO Electrical requirements Medium Interface: AGC Electrical requirements Depends on Line Code DMT or SCM VDSL Standard Scrambling
  41. 41. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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
  42. 42. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 42 DSP in PMS-TC + PMD + Medium Interface for DMT-VDSL IFFT Cyclic Extension TX Windowing LPF Line Driver Hybrid tip ring symbol mapper Bit Extraction with Tone Ordering DAC Framing CRC Scrambling FEC Interleaving Framing CRC Scrambling FEC slow fast fast slow FFT Remove Cyclic Extension RX Windowing ADC LPF Hybrid tip ring Slicer symbol demapper FEQ TEQ bit insertion with tone ordering de- Framing CRC checksum de- Scrambling FEC decoder de- Interleaving de- Framing CRC checksum de- Scrambling FEC decoder slow fast fast slow Near Transmitter Far Receiver
  43. 43. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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
  44. 44. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 44 Training signals in DMT-VDSL • VDSL training signals and FSM allow configuration of features during training 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 Amplitude Tone Index q Pilot tone Data carrier Tone amplitudes at the receiver
  45. 45. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 45 VDSL line codes Discrete Multi-Tone (DMT): All international standards for ADSL, ADSL2, ADSL2+, VDSL1 and VDSL2 are based on DMT Single Carrier Modulation: Two international standards for VDSL1 include SCM
  46. 46. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 46 DMT and SCM Signal PSD (dBm/Hz) Frequenc y (MHZ) freq. 1 freq. 2 freq. 3 freq. 4 freq. 5 US1 DS1 US2 DS2 US3 Signal PSD (dBm/Hz) Frequenc y (MHZ) freq. 1 freq. 2 freq. 3 freq. 4 freq. 5 US1 DS1 US2 DS2 US3 DISCRETE MULTI TONE (Divide and Conquer) SINGLE CARRIER MODULATION Mr. FEC
  47. 47. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 47 DMT Processing
  48. 48. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 48 SCM Processing
  49. 49. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 49 Comparing DMT and SCM Issues Deleterious effects DMT solution SCM solution Advantages of DMT over SCM Channel Time Dispersion Signal Smearing Equalization: Two simple equalizers, one in time domain and one in frequency domain Equalization: One complicated equalizer in time domain Simplicity in design and implementation Frequency dependent Noise Frequency dependent signal-to- noise ratio (SNR) Bit loading: Transmit more bits in frequency bands where there is less noise and less bits in frequency bands where there is more noise No bit loading: Transmit the same average number of bits in every frequency band regardless of amount of noise in each frequency band Bandwidth efficiency and higher throughput FDD full duplex operation in multi-band spectrum plans Interference between upstream and downstream signals Signal separation: Use no filtering, utilize Fourier Transform orthogonality properties Signal separation: Use one complicated filter per transmission band Higher spectrum utilization, higher throughput and flexible implementation of different band plans
  50. 50. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 50 Deployment of VDSL
  51. 51. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 51 Deployment options Network topology Deployment architecture •VDSL and POTS •Integrated Telephony •Multi-Services Platform •Direct deployment •Fiber extensions
  52. 52. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 52 Network topology for VDSL and POTS VDSL MODEM Phone Switch Internet DSLAM Splitter Splitter WAN PSTN Twisted Pair "Last Mile" "First Mile" backbone backbone packet or cell based circuit based CO: Central Office CPE: Customer's Premises Equipment POTS POTS DS: Downstream US: Upstream VDSL VDSL Voice Voice VDSL + POTS POTS: Analog Voice (filter) (filter) Two networks
  53. 53. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 53 Network topology for integrated telephony VDSL LIM ONT CO/Exchange/cabinet CPE VDSL VDSL VOICE VOICE VDSL + POTS backbone splitter splitter
  54. 54. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 54 Network topology for multi-services over VDSL “Multi-service” platform (DSL, voice, video, data) VDSL modem Gateway Twisted pair internet PSTN Video WAN fiber
  55. 55. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 55 • 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 Deployment Architectures
  56. 56. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 56 Deployment with Fiber Extensions Modified from source: ITU-T FS-VDSL FGTS Technical Specification, "Part 1: Operator requirements,“ Version 1.0.0 5 June 2002 ONU: Optical Network Unit OLT: Optical Line Termination < 4.5 Kft < 4.5 Kft < 900 ft < 100 ft (1000 lines) (10-100 lines) (10 lines) (10 lines)
  57. 57. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 57 VDSL and POTS: CO/RT D < 4500 ft; DS/US = 13/13 to 54/13 Mbps VDSL MODEM Internet DSLAM Splitter Splitter WAN phone switch Bundle of Twisted Pairs backbone packet or cell based CABINET RT POTS VDSL VDSL Voice Voice VDSL + POTS Bundle of Twisted Pairs 100's, 1000's ft phone switch CO < 4500 ft D
  58. 58. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 58 VDSL and POTS: FTTX FTTCab FTTCurb D < 4500 ft; DS/US = 13/13 to 54/13 Mbps D < 4500 ft; DS/US = 13/13 to 54/13 Mbps D < 900 ft; DS/US = 50/20 to 100/30 Mbps ONU cpe Exchange/Cabinet/ONU D VDSL VDSL VOICE VOICE VDSL+VOICE
  59. 59. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 59 •DS/US = 100/50 Mbps for VDSL1 •DS/US = 100/100 Mbps for VDSL2 VDSL and POTS: FTTB D < 100 ft; ONU < 100 ft CPE VDSL + POTS Individual Twisted pairs D VDSL VDSL VOICE VOICE
  60. 60. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 60 CO/RT Integrated Telephony: FTTX FTTCab FTTCurb D < 4500 ft; DS/US = 13/13 to 54/13 Mbps D < 4500 ft; DS/US = 13/13 to 54/13 Mbps D < 900 ft; DS/US = 50/20 to 100/30 Mbps ONU < 900 ft cpe Exchange/Cabinet/ONU D VOICE VOICE VDSL VDSL VDSL + POTS
  61. 61. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 61 CO/RT VDSL LIM ONT fiber ONU < 100 ft Individual Twisted pairs CPE •DS/US = 100/50 Mbps for VDSL1 •DS/US = 100/100 Mbps for VDSL2 Integrated Telephony: FTTB D < 100 ft; D VDSL VDSL VOICE VOICE VDSL + VOICE
  62. 62. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 62 Multi-services platform FTTCurb •DS/US = 50/20 to 100/30 Mbps D < 900 ft; Gateway < 900 ft Data Video Voice Premises D Multi-services platform (DSL, voice, video, data)
  63. 63. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 63 • 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) Applications
  64. 64. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 64 ATM/PTM over VDSL TPS-TC: ATM-TC OR PTM-TC (fast and slow) Transmission Medium: PMS-TC PMD Transport: ATM or PTM TPS-TC: ATM-TC OR PTM-TC (fast and slow) PMS-TC PMD Transport: ATM or PTM Transmitter Receiver Medium Interface Medium Interface Exchange CPE/RT VDSL PHY CPE
  65. 65. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 65 Ethernet over VDSL PTM-TC PMS-TC PMD MII Medium Interface Transmission Medium (Twisted pair) PTM-TC PMS-TC PMD MII Medium Interface Ethernet MAC MII Ethernet Phy Transmission Medium (LAN) Ethernet port Ethernet MAC MII Ethernet Phy Transmission Medium Ethernet Core Network VDSL PHY CPE/RT CO Exchange CPE
  66. 66. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 66 The future … • Data rate for VDSL • VDSL.n? – Better coding techniques – Interference mitigation           MARGIN GAIN GAP LOOP Loop VDSL Noise Code SNR SNR B R 1 log2
  67. 67. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 67 FERNANDO RAMIREZ-MIRELES ramirezm@ieee.org
  68. 68. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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.
  69. 69. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 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
  70. 70. VDSL for Triple Play Copyright 2010 Fernando Ramirez-Mireles ramirezm@ieee.org, framirez@itam.mx 70 About the author Fernando has over 10 years of experience in R&D in VDSL, UWB and speech processing. He has worked in the DSL field as a systems and algorithms engineer. He is currently a professor in the engineering division at ITAM in Mexico City. He has authored more than twenty technical articles and has one patent granted and two more pending. He is a senior member of the IEEE. He can be reached at ramirezm@ieee.org.

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