logging in or signing up chioffi Herminia Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 273 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 26, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript DMT - based XDSL: The On-Ramp to the Information Superhighway: DMT - based XDSL: The On-Ramp to the Information Superhighway John M. Cioffi Stanford University CTO & Founder, Amati July, 1997 P:650-723-2150 F:650-723-8473 cioffi@isl.stanford.eduNew Revenue for Service Providers “Superhighway”: New Revenue for Service Providers “Superhighway” M E D I ATwisted Pairs “xDSL”: Twisted Pairs “xDSL” Avoid cost of new media deployment (fiber, HFC, coax, or wireless) over 100x increase in bit rates w.r.t. voiceband modems Incremental - pay for equipment on only those customers who ask for service Deploy sooner Problem: HARD TRANSMISSION PROBLEM Asymmetric DSL (ADSL): Asymmetric DSL (ADSL)A/xDSL & VDSL: A/xDSL & VDSLOther “x=“ ‘s : Other “x=“ ‘s Hdsl (symmetric 1.5, 2 Mbps) Sdsl (symmetric 384 kbps) Idsl (symmetric 160 kbps) software substitutions with respect to existing standards - “DSLAM” all rates within existing T1.413 or minor modificationsOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthTwisted-Pair channels: Twisted-Pair channels highly variable characteristics attenuation varies with length frequency bridge taps gaugeADSL Loops: ADSL Loops d d 3-5 mile loops loops with bridge tapsVDSL Loops: VDSL Loops LOOP VDSL5 LOOP VDSL1Crosstalk: Crosstalk Dominant noises, increased coupling at higher frequencies - must be mitigated in design NEXT - 10-13 f1.5 ; FEXT - 10-19 d |H(f)|2 f2Other Noises: Other Noises Radio Noise, AM, HAM 1 mW differential into rcvr must reject HAM by 70-90 dB (VDSL) and AM by 20-40 dB (ADSL) Impulse Noise 10’s millivolts 100’s microseconds narrowband (high amplitude) broadband (low amplitude)Radio Emissions: Radio Emissions like crosstalk, except into radio receivers VDSL amateur (HAM) bands Public Safety bands transmit in discontinuous bandsOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthDMT Loading Basics (adapts to each line): DMT Loading Basics (adapts to each line) Frequency CAP 600 Million phone lines and growing fast! Bellcore tests, 1993 (ANSI Standard) GTE tests, 1996 ; NSTL, 1996Competitive Tests , CAP vs DMT: Competitive Tests , CAP vs DMT 1993 - ANSI Bake off - 1.5 Mbps (Bellcore) Again 1996/7 - GTE 1997 Tests - 6 Mbps/640 kbps CAP RADSL range limit - 1.5 km - coverage 50% DMT range limit - >2.5 km - coverage 95% 28 dB improvement DMT consumed less power !!DMT Impulse Control: DMT Impulse Control amplitude (AMI,2B1Q, PAM, Low latency Less memory1996 Telchoice/NSTLResults: 1996 Telchoice/NSTLResults See October 12 issue File transfer speeds with TCP/IP Amati DMT modem 1.5M/160k ; 4M/384k (also 8M) >99% of bit rate on file transfer ranges from 15000 ft to 22000 ft file transfer speed is several times CAP capability CAP modem used 7 Watts (DMT was 6.1W)Radio Emissions: Radio Emissions like crosstalk, except into radio receivers (BT recording) frequencyOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthAsymmetric DSL (ADSL): Asymmetric DSL (ADSL)Rate Adaption: Rate Adaption DMT will rate adapt allows connection on almost any line at highest reliable rate match to internet useDesign Details - ADSL T1.413 (ANSI/ETSI): Design Details - ADSL T1.413 (ANSI/ETSI) 256 tones - DMT, about 4 kHz (4.375) multiples of 32 kbps, Rate Adaptive Full training, OAMP primitives RS FEC, Trellis (4D Wei) fast/slow dual latency path Issue 2 now virtually complete, adds ATM ITU g.adsl standard evolvingDMT Suppliers/Customers - ADSL: DMT Suppliers/Customers - ADSL Suppliers - Alcatel, Amati, Analog Dev, Ericsson, Fujitsu, Motorola, NEC, Nokia, Nortel, Siemens, Texas Instruments Telco’s - DT, FT, BT, Bezec, Swiss PTT, KT,Telstra, GTE, Pacific Bell, Ameritech, SW Bell, Bell South, HKT, Telia, ...Outline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthAsymmetric VDSL: Asymmetric VDSL Higher Speeds, 2,6,13, 26, 52 Mbps Shorter Distances .5 to 3 km Symmetric and/or Asymmetric STANDARDS PROJECT ANSI T1E1.4 ETSI TM6 6-26 Mbps Similar to ADSL, except very low power requirement shorter distances and higher speeds.Symmetric VDSL: Symmetric VDSL fiber wireless Avoid Inverse Mux costs (large) connect buildings within campus Symmetric - early market is data com/enterprize net progress to full service as telco’s evolveSDMT “Ping-Pong” Superframe: SDMT “Ping-Pong” Superframe 25 ms Program length of “ping” and “pong” for asymmetric vs symmetric 500 microsecond frame/delay, synchronized SDMT Group to ANSI/ETSI: Alcatel, Amati, Cadence, NEC, Rockwell, Samsung, Siemens, SGS-T, TI Amati/NEC version is 1997 - it’s tiny! “Piccolo”Asymmetric Range/Rate: Asymmetric Range/RateSymmetric Range/Rate: Symmetric Range/RateOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthTwo VLSI approaches to “x”DSL: Two VLSI approaches to “x”DSL Telecom semiconductor approach (Motorola, Alcatel, SGS-T, ADI, NEC) single chip integrated analog/digital ATM interfaces - full service Datacom semiconductor approach (Rockwell, TI, Amati, Mo-IS) Heavy software CO concentrates, modem changes through softwarePower/Price of Concentrated solution: Power/Price of Concentrated solution < ADSL power under 1 W/line at CO Price - the power supply dominates at CO side RT is usual modem priceConclusion: Conclusion TP transmission hard DMT excellent match good performance lowest power/cost truly available Widely deployed and in many Telco’s network plans You do not have the permission to view this presentation. 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chioffi Herminia Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 273 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 26, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript DMT - based XDSL: The On-Ramp to the Information Superhighway: DMT - based XDSL: The On-Ramp to the Information Superhighway John M. Cioffi Stanford University CTO & Founder, Amati July, 1997 P:650-723-2150 F:650-723-8473 cioffi@isl.stanford.eduNew Revenue for Service Providers “Superhighway”: New Revenue for Service Providers “Superhighway” M E D I ATwisted Pairs “xDSL”: Twisted Pairs “xDSL” Avoid cost of new media deployment (fiber, HFC, coax, or wireless) over 100x increase in bit rates w.r.t. voiceband modems Incremental - pay for equipment on only those customers who ask for service Deploy sooner Problem: HARD TRANSMISSION PROBLEM Asymmetric DSL (ADSL): Asymmetric DSL (ADSL)A/xDSL & VDSL: A/xDSL & VDSLOther “x=“ ‘s : Other “x=“ ‘s Hdsl (symmetric 1.5, 2 Mbps) Sdsl (symmetric 384 kbps) Idsl (symmetric 160 kbps) software substitutions with respect to existing standards - “DSLAM” all rates within existing T1.413 or minor modificationsOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthTwisted-Pair channels: Twisted-Pair channels highly variable characteristics attenuation varies with length frequency bridge taps gaugeADSL Loops: ADSL Loops d d 3-5 mile loops loops with bridge tapsVDSL Loops: VDSL Loops LOOP VDSL5 LOOP VDSL1Crosstalk: Crosstalk Dominant noises, increased coupling at higher frequencies - must be mitigated in design NEXT - 10-13 f1.5 ; FEXT - 10-19 d |H(f)|2 f2Other Noises: Other Noises Radio Noise, AM, HAM 1 mW differential into rcvr must reject HAM by 70-90 dB (VDSL) and AM by 20-40 dB (ADSL) Impulse Noise 10’s millivolts 100’s microseconds narrowband (high amplitude) broadband (low amplitude)Radio Emissions: Radio Emissions like crosstalk, except into radio receivers VDSL amateur (HAM) bands Public Safety bands transmit in discontinuous bandsOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthDMT Loading Basics (adapts to each line): DMT Loading Basics (adapts to each line) Frequency CAP 600 Million phone lines and growing fast! Bellcore tests, 1993 (ANSI Standard) GTE tests, 1996 ; NSTL, 1996Competitive Tests , CAP vs DMT: Competitive Tests , CAP vs DMT 1993 - ANSI Bake off - 1.5 Mbps (Bellcore) Again 1996/7 - GTE 1997 Tests - 6 Mbps/640 kbps CAP RADSL range limit - 1.5 km - coverage 50% DMT range limit - >2.5 km - coverage 95% 28 dB improvement DMT consumed less power !!DMT Impulse Control: DMT Impulse Control amplitude (AMI,2B1Q, PAM, Low latency Less memory1996 Telchoice/NSTLResults: 1996 Telchoice/NSTLResults See October 12 issue File transfer speeds with TCP/IP Amati DMT modem 1.5M/160k ; 4M/384k (also 8M) >99% of bit rate on file transfer ranges from 15000 ft to 22000 ft file transfer speed is several times CAP capability CAP modem used 7 Watts (DMT was 6.1W)Radio Emissions: Radio Emissions like crosstalk, except into radio receivers (BT recording) frequencyOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthAsymmetric DSL (ADSL): Asymmetric DSL (ADSL)Rate Adaption: Rate Adaption DMT will rate adapt allows connection on almost any line at highest reliable rate match to internet useDesign Details - ADSL T1.413 (ANSI/ETSI): Design Details - ADSL T1.413 (ANSI/ETSI) 256 tones - DMT, about 4 kHz (4.375) multiples of 32 kbps, Rate Adaptive Full training, OAMP primitives RS FEC, Trellis (4D Wei) fast/slow dual latency path Issue 2 now virtually complete, adds ATM ITU g.adsl standard evolvingDMT Suppliers/Customers - ADSL: DMT Suppliers/Customers - ADSL Suppliers - Alcatel, Amati, Analog Dev, Ericsson, Fujitsu, Motorola, NEC, Nokia, Nortel, Siemens, Texas Instruments Telco’s - DT, FT, BT, Bezec, Swiss PTT, KT,Telstra, GTE, Pacific Bell, Ameritech, SW Bell, Bell South, HKT, Telia, ...Outline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthAsymmetric VDSL: Asymmetric VDSL Higher Speeds, 2,6,13, 26, 52 Mbps Shorter Distances .5 to 3 km Symmetric and/or Asymmetric STANDARDS PROJECT ANSI T1E1.4 ETSI TM6 6-26 Mbps Similar to ADSL, except very low power requirement shorter distances and higher speeds.Symmetric VDSL: Symmetric VDSL fiber wireless Avoid Inverse Mux costs (large) connect buildings within campus Symmetric - early market is data com/enterprize net progress to full service as telco’s evolveSDMT “Ping-Pong” Superframe: SDMT “Ping-Pong” Superframe 25 ms Program length of “ping” and “pong” for asymmetric vs symmetric 500 microsecond frame/delay, synchronized SDMT Group to ANSI/ETSI: Alcatel, Amati, Cadence, NEC, Rockwell, Samsung, Siemens, SGS-T, TI Amati/NEC version is 1997 - it’s tiny! “Piccolo”Asymmetric Range/Rate: Asymmetric Range/RateSymmetric Range/Rate: Symmetric Range/RateOutline: Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation TruthTwo VLSI approaches to “x”DSL: Two VLSI approaches to “x”DSL Telecom semiconductor approach (Motorola, Alcatel, SGS-T, ADI, NEC) single chip integrated analog/digital ATM interfaces - full service Datacom semiconductor approach (Rockwell, TI, Amati, Mo-IS) Heavy software CO concentrates, modem changes through softwarePower/Price of Concentrated solution: Power/Price of Concentrated solution < ADSL power under 1 W/line at CO Price - the power supply dominates at CO side RT is usual modem priceConclusion: Conclusion TP transmission hard DMT excellent match good performance lowest power/cost truly available Widely deployed and in many Telco’s network plans