chioffi

60 %
40 %
Information about chioffi
Entertainment

Published on November 26, 2007

Author: Herminia

Source: authorstream.com

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.edu New Revenue for Service Providers “Superhighway”:  New Revenue for Service Providers “Superhighway” M E D I A Twisted 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 & VDSL Other “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 modifications Outline:  Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation Truth Twisted-Pair channels:  Twisted-Pair channels highly variable characteristics attenuation varies with length frequency bridge taps gauge ADSL Loops:  ADSL Loops d d 3-5 mile loops loops with bridge taps VDSL Loops:  VDSL Loops LOOP VDSL5 LOOP VDSL1 Crosstalk:  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 f2 Other 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 bands Outline:  Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation Truth DMT 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, 1996 Competitive 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 memory 1996 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) frequency Outline:  Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation Truth Asymmetric 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 use Design 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 evolving DMT 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 Truth Asymmetric 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 evolve SDMT “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/Rate Symmetric Range/Rate:  Symmetric Range/Rate Outline:  Outline Transmission Challenges DMT vs the transmission challenges ADSL and T1.413 Standard DMT V/XDSL and SDMT Implementation Truth Two 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 software Power/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 price Conclusion:  Conclusion TP transmission hard DMT excellent match good performance lowest power/cost truly available Widely deployed and in many Telco’s network plans

Add a comment

Related presentations

Related pages

Home [chioffilaw.com]

Chioffi Law LLC is dedicated to focusing on its clients’ personal planning needs. We are good listeners and work hard to understand our clients ...
Read more

Attorneys - Chioffi Law

Mark P. Chioffi. Mark P. Chioffi is the Managing Member of Chioffi Law LLC. He practices in the areas of estate planning, including succession planning for ...
Read more

Juliana Chioffi | LinkedIn

View Juliana Chioffi’s professional profile on LinkedIn. LinkedIn is the world's largest business network, helping professionals like Juliana Chioffi ...
Read more

Reynders, McVeigh Capital Management hires Lisa Chioffi as ...

Reynders, McVeigh Capital Management, a socially progressive investment management firm, has appointed Lisa Chioffi, CFA as a Senior Portfolio Manager.
Read more

Cam Chioffi - US Youth Fly Fishing Team — US Youth Fly ...

Cam Chioffi – Weston, MA. Taught by his dad and grandfather, Cam has loved fishing since he was two. At age eight, he was introduced to fly
Read more

Mark Chioffi | LinkedIn

View Mark Chioffi’s professional profile on LinkedIn. LinkedIn is the world's largest business network, helping professionals like Mark Chioffi discover ...
Read more

Weston athlete Cam Chioffi excelling on big fly fishing ...

PITTSFORD, Vt. — Cam Chioffi, 17, was named after Bruins great Cam Neely. He is the starting goalie for the Weston High School hockey team. But that’s ...
Read more

Giulio Chioffi | Facebook

Giulio Chioffi is on Facebook. Join Facebook to connect with Giulio Chioffi and others you may know. Facebook gives people the power to share and makes...
Read more

Chioffi’s service to the town : Rutland Herald Online

Rutland Town has an outstanding candidate for the three-year term of selectman, that being Don Chioffi who has a proven record of service as was ...
Read more