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xDSL Access work in ITU-T Study Group 1 5

xDSL Access work in ITU-T Study Group 1 5. Presented by: Paolo ROSA Counsellor – ITU-T Study Group 1 5 Optical and other transport networks. Contents. About ITU-T SG 15 Access Scenarios xDSL Access. About Study Group 15 (www.itu.int/ITU-T/studygroups/com15). ITU-T Study Group 15.

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xDSL Access work in ITU-T Study Group 1 5

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  1. xDSL Access work in ITU-T Study Group 15 Presented by: Paolo ROSA Counsellor – ITU-T Study Group 15 Optical and other transport networks

  2. Contents • About ITU-T SG 15 • Access Scenarios • xDSL Access

  3. About Study Group 15(www.itu.int/ITU-T/studygroups/com15)

  4. ITU-T Study Group 15 Responsible for studies relating to: • optical and other transport networks, systems and equipment including transmission layer related standards for access, metropolitan and long haul sections of communication networks and relevant G-series Recoimmendations. Lead Study Group on • Access Network Transport (ANT) • Optical Technology

  5. ITU-T SG 15 Access Network Transport - Targeted Work and Standardization Plans • Finalize a Standardization Plan for: • identify existing Recs and standards • identify areas of overlapping • identify any missing area • resolving standardization issues for ANT • investigate needs for new Recommendations (www.itu.int/ITU-T/studygroups/com15)

  6. Home Network Many a type of access SAT Broadcast Access Network Distribution Network Cable Longhaul Copper or F.O. F.O. Copper UNI SNI

  7. ITU-T Study Group 15 Structurehttp://www.itu.int/ITU-T/studygroups/com15/index.asp Study Group 15 Optical and other transport networks Peter Wery ITU-TSB Counsellor Paolo Rosa Working Party 1 Network Access Andrew Nunn Working Party 2 Network Signal Proc. Yushi Naito Working Party 3 OTN Structure Stephen Trowbridge Working Party 4 OTN Technology Gastone Bonaventura Working Party 5 Projects and Promotion Haruo Okamura

  8. Access Scenarios

  9. Typical Access Network Construction Central Office (Exchange) Street Cabinet Distribution Network Feeder Network Underground Feed Overhead Feed

  10. Access technological evolution G-PON 2.5 Gbit/s OPTICAL ACCESS 622 Mbit/s 50 Mbit/s VDSL 25 Mbit/s 8 Mbit/s HDSL/ ADSL 2 Mbit/s 640 kbit/s ISDN 128 kbit/s 56.6 kbit/s Analog modems 28.8 kbit/s Year 9.6 kbit/s 1989 2000 1997 2003

  11. Capacity, technologies & availability 1G FTTH 100M VDSL, FTTCab 10M ADSL bit/s) SDSL 1M double in 18 mon . 100k ISDN double in 24 mon . Bit rate per user ( 10k N.B. The technology bars show 1k the introduction, not the end of PSTN / Modem the technology 100 1980 1990 2000 2010 2020 Year There will never be enough! The bandwidth demand will continue to grow. Fiber to the home will be necessary sooner or later. Source Siemens

  12. Optical access network architecture (G.983.1) Optical Distribution Network FTTH O N U O L T Fibre Copper FTTB/C N T O N U Fibre SNI HOME Fibre Copper N T O N U FTTCab Access network

  13. Customer Premise Core Network Access Network (AN) Network (CPN) (CN) XNI SNI xxn yn Q Wireless XNI WI1 Phone SNI Access S1 Service Network Function [X] Phone XNI CP1 x Access L SNI C1 TV Unit Core [X] XNI CX1 Network Access PC Network [Y] Access Network Transport Reference Model

  14. Scenario 1 Services a) Voice/Data over telecom network and Video over cable, radio&DSB b) Voice/Data/Video over 2- way cable Core Network Existing Infrastructure (PSTN/N-ISDN) Access network • 1-way Cable Distribution Network • b) 2-way Cable Distribution Network • DSB/terrestrial broadcasting in 1 a) CPN Access Unit TV, PC, Phone Information Flow a) Video Distribution over 1-way cable network, return via PSTN/ISDN Access Network Scenarios – 1 - 2 Scenario 2 a) Voice/Data over telecom network andVideo over cable b) Voice/Data/Video over 2-way cable B-ISDN

  15. Scenario 3 Scenario 4 Services Voice/Data & Video over ADSL/VDSL Voice/Data & Videoover Fibre Network Core Network B-ISDN B-ISDN Access network ADSL/VDSL Fibre (Fibre to the curb/home) CPN Access UnitTV, PC, Phone Access UnitTV, PC, Phone Information Flow Access Network scenarios – 3 - 4

  16. Service Access Network Function CPN {Video} SNI S1 Phone Access TV Unit XNI CP2 SNI Core [ADSL] C3 Network PC [ADSL] (N-ISDN) SNI C4 CPN Phone XNI Core CP3 Access Network [VDSL] TV Unit (B-ISDN) [VDSL] SNI C4 PC Scenario 3 The use of ADSL or VDSL for video bandwidth over copper pairs

  17. Service Service Function Function CPN {Internet} {Video} Phone Access Unit TV Access FTTH Network SNI DI C 5 OA 1 PC [FTTH] Core Network SNI C 6 CPN (B - ISDN) Access Phone Network Access [FTTC] Unit TV [FTTB] FTTC DI CP 3/4 FTTB PC Scenario 4 Fibre Access – FTTC - FTTH – FTTB

  18. Scenario 5 Services a) Wireless Phone Voice/Data over telecom network and Video over cable b) Voice/Data/Video over Radio Core Network N-ISDN orB-ISDN Access network Radio/Wirelessfor Voice/Data - Cable for a) Video CPN Access UnitTV, PC, Phone, wireless Phone Information Flow 2-way wireless ANT – Scenario 5

  19. Scenario 5 The use of Radio in the Local Loop Access Network Service Function SNI S 1 {Video} CPN XNI CX 1 Access [CATV] TV Unit [CATV] SNI C 2 PC XNI CP 1 SNI C 1 Access (N-ISDN) Unit (N-ISDN) [N - ISDN] Wireline Phone SNI C 7 Core Network Wireless XNI Phone WI 1 [Wireless] Wireless Phone

  20. Scenario 6 Scenario 7 Services B-ISDN, Internet and Mobile Phone via Satellite a) Data over Internet Voice/Video and/or Data over Internet Core Network B-ISDN or Existing (N-ISDN) a) POTS/FR/ATM b) ATM Backbone Access network Satellite a) ADSL/VDSL b) PSTN/ISDN, HFC, PON c) Fixed wireless Access CPN Access Unit: TV, PC, Phone Access Unit: TV, PC, Phone Information Flow 2-way satellite ANT Scenarios 6 - 7

  21. XNI WI4 X NI Mobile Satellite BISDN Satellite WI3 Network Telecommunications Network Network Physical Presentation XNI L F SA XNI 1 SA1 Switch L A XNI Access Unit CP5 SNI C8 (Gateway SNI Earth C1 Access Network Station) Access NT- Unit (s) function CPE Phone PSTN or ISDN XNI CP1 L PC B XNI Video S XNI A1 CP1 ISP port server Scenario 6 - Access using satellites

  22. Service Service Function Function {Internet} { Video,etc} CPN SNI S 2 SNI Phone S 1 XNI SNI Access Core Access CP 2 C 3 Unit Network Network TV [ADSL] (N - ISDN) [ADSL] SNI C 3 PC XNI CP 2 Edge Switch Splitter SNI S 2 SNI S 1 Scenario 7 Example of Internet Access

  23. xDSL Access

  24. xDSLMarket & Business Drivers • xDSL technology allows the provision of high-speed Internet access and other broadband services over existing copper telephone lines • Incumbent operators need to exploit their large installed base of copper access lines for broadband deployment • Competing operators can exploit incumbent operators access lines via ‘unbundling’ agreements • Competition: • Digital Cable / Cable Modem • Bi-directional Satellite

  25. xDT xDSL Transceiver DTU-R = Transceiver Unit- Remote DTU-C = xDSL Transceiver Unit- Central office Typical components of an xDSL system ADSL2+ ADSL2 ADSL ADSL lite HDSL SHDSL VDSL audio/video/data CUSTOMER PREMISES CENTRAL OFFICE xDTU-R xDTU-C SNI T • B-ISDN SN xDT xDT • Non-ATM based SN (e.g. - video server - IP router) U-R U-C POTS POTS • PSTN/ISDN Splitter Splitter SN (Subscriber line) = SN = Service Node xDSL

  26. ITU-T Recommendations on ADSL (1) • G.991.1 (G.hdsl) - High bit rate Digital Subscriber Line (HDSL) transmission system on metallic local lines. • G.992.1 (G.dmt) - Asymmetrical Digital Subscriber Line (ADSL) Transceivers. • G.992.2 (G.lite) - Splitterless Asymmetrical Digital Subscriber Line (ADSL) Transceivers. • G.992.3 Asymmetric digital subscriber line transceivers - 2 (ADSL2.dmt) • G.992.4 Splitterless asymmetric digital subscriber line transceivers - 2 (ADSL2.lite)

  27. ITU-T Recommendations on ADSL (2) • G.992.5 – Asymmetric Digital Subscriber Line (ADSL) Transceivers – Extended Bandwidth ADSL2 (ADSL2plus) (Jan ’03) • G.995.1 - Overview of Digital Subscriber Line (DSL Recommendations). • G.991.2 (G.shdsl) - Single pair High bit rate speed Digital Subscriber Line • G.993.1 (G.vdsl) - Very high bit-rate Digital Subscriber Line • G.994.1, G.996.1 and G.997.1 for tests, management and handshake

  28. G.991.2 (SHDSL) transceivers • Multi-rate transmission technology • duplex operation over only two-wire twisted metallic pairs. (G.991.1 is for 1-3 pairs). • Symmetric data rates (scalable): • One pair mode: 192 kbit/s to 2312 Kbit/s (single pair mode), in increments of 8 kbit/s, distance from 1.8 up to 6.5 km. • Two-pair mode: 384 kbps to 4.624 Mbps • Many Manufacturer’s options • 4-wire operation • Repeaters, etc.

  29. G.993.1 (VDSL) transceivers • Symmetric and asymmetric data rates • Downstream as high as 5 to 20 Mbit/s • Upstream 1.6, 2.3, 19 Mbit/s or equal to downstream in case of symmetric tx. • American/Japanese/European (Annexes: spectrum bandplans for national regulators) • 300 – 1 500 m. reach

  30. G.992.1 - Asymmetric Digital Subscriber Line transceivers • One twisted pair • Payload upstream up to 640 kbit/s • Downstream up to 6.144 Mbit/s • Simultaneous Voiceband and N-ISDN possible • Line Code - DMT (Discrete MultiTone)

  31. G.992.2 - Splitterless asymmetric digital subscriber line transceivers • One twisted pair • Payload downstream up to 1.536 Mbit/s • Upstream up to 512 kbit/s • Line Code - DMT (Discrete MultiTone)

  32. ADSL versus ADSL2(G.992.1 x G.992.3) • 2nd generation of ADSL with improvements on: • Loop-reach increase for equivalent bit rates (300m) • Higher down/up bit rates • loop diagnostics • Adjustable spectrum shaping during operat/initializ • Power vs traffic control: L0(full),L1, L2 • robustness against loop impairments and RFI • Improved multivendor interoperability • Improved application support for an all digital mode of operation and voice over ADSL operation;

  33. ADSL 2 • Performance • Downstream: 8 Mbit/s to 15 Mbit/s • Upstream: 800 Kbit/s to 1.5 Mbit/s • Data rate on long distances • Improved initialization • Fast Start up : 3 seconds • Fast return to L0 status full operation (0.5 s) • Additional 256 Kbit/s upstream data rate • In-line filters for home installation • Backwards/Legacy compatibility

  34. ADSL 2 plus - G.992.5 • Performance • Increase downstream: to 16 Mbit/s • Maybe increase in upstream (Oct. 2003) • Increase reach (1.5 - 3 Km) • ADSL + doubles the bandwidth (from 1.1 to 2.2 MHz) with a significant increase of data rates on short loops • Backwards compatibility (needs G.992.3)

  35. Things in progress in SG15 • Network access • Home networking (data on in-premises wiring) • Refinements & enhancements xDSL • Web-based ANT standardization plan • Optical Transport Network (OTN) • x-WDM and 40Gbit/s signal channels • Optical Cross-Connect and Switch • Fiber characteristics, more channels/fiber • Network Node Interface for OTN • Continue as Lead Study Group on • Access Network Transport • Optical Technology

  36. Q.4/15 - Transceivers for customer access and in-premises phone line networking systems on metallic pairs Current/future work • Revision of Single-pair High-speed DSL (SHDSL) - G.991.2 • G.992.3 Annex C : ADSL in same ISDN cable • G.992.3 Annex L : reach extended ADSL over POTS • G.992.5 Annex J : improved Spectral Compatibility with ADSL over ISDNimproved Spectral Compatibility with ADSL over ISDN • G.992.5 Annex L : extended upstream bandwidth • Very high bit rate DSL (VDSL) – G.vdsl.l

  37. CONCLUSIONS An overview on the standardizations activities in ITU-T SG 15 was presented The most recent standards for access network approved and consented in October 2002 and January 2003 were shown Access scenarios, current and future work provide information about the next future in the field of access copper network technologies

  38. Thank you for your attention! For further contact, please feel free to contact: Counsellor for SG 15: Paolo Rosa Paolo.rosa@itu.int Tel: +41-22-730-5235 Fax: +41-22-730-5853 http://www.itu.int/ITU-T

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