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Status Report of Digital Subscriber Line Work in Committee T1

Status Report of Digital Subscriber Line Work in Committee T1. Rick Townsend T1E1 Chairman Wayne Zeuch T1 Vice Chairman. Broadband Access. Spectrum Management. Enhancements to T1.417-2001, Spectrum Management for Loop Transmission Systems”

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Status Report of Digital Subscriber Line Work in Committee T1

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  1. Status Report of Digital Subscriber Line Work in Committee T1 Rick Townsend T1E1 Chairman Wayne Zeuch T1 Vice Chairman GSC-8, OTTAWA

  2. Broadband Access Spectrum Management • Enhancements to T1.417-2001, Spectrum Management for Loop Transmission Systems” • Requirements and recommendations for DSL loop systems; addresses deployment guidelines for power spectral density (PSD), total average power, transverse balance, longitudinal output voltage • Issue 2 specifically addresses spectral compatibility of repeaters, intermediate transceivers; also now addresses HDSL and VDSL • Enhancements address NRIC-V directives (the Network Reliability and Interoperability Council is an advisory committeeof the U.S.FCC) • Dynamic Spectrum Management (DSM) • Improving reliability and increasing data rates through measurement and/or dynamic management of DSL spectral density • May provide recommendations for adaptive or dynamic assignment of lines, signals, spectra • Possible new directions include programmable PSDs and multi-channel crosstalk modeling to achieve spectrum optimization GSC-8, OTTAWA

  3. Broadband Access ADSL (Asymmetric DSL) • Bonding approaches to increase bit-rates for symmetric services (> 733.3 kBaud) • eSHDSL: Studying power spectral density compatibility for operating with ADSL and VDSL • Potential for multi-Mbit/s rates (2 pair) and 10 Mbit/s (3 pair) • Discussions on extending ADSL bit rates for asymmetric service (ADSLplus or ADSL2+) • Spectral compatibility of 256 kHz upstream channel relative to ITU-T Rec. G.992.5 SHDSL (Single-pair High-speed DSL) GSC-8, OTTAWA

  4. Broadband Access M²DSL (Multi-rate Multi-pair DSL) • Formerly known as 10 MDSL; supporting bit rates up to 10Mbit/s on short loops • Bonding techniques (applied to multiple wire pairs for higher aggregate bit-rates) • Guidelines for enabling multi-Mbit rates to all customers on loops to meet rate-reach objectives • Addressing symmetric bit-rate transmission; may also address asymmetric transmission • Consideration of advanced performance optimization techniques for multi-pair transmission • Multi-pair vectoring, advanced coding GSC-8, OTTAWA

  5. Broadband Access VDSL (Very-high-bit-rate DSL) • VDSL American National Standard for Trial Use, T1.424 (expires March 2004) • Functional requirements and common specification, SCM, and MCM • Liaison with IEEE 802.3ah (Ethernet in the First Mile – EFM) to identify an appropriate solution for the metallic, copper-based Physical Layer • Progress on defining: • bit-rate reach tests, power spectrum density tests, and up-stream power back-off tests • Further work needed in defining: • Impulse noise, latency, stability testing GSC-8, OTTAWA

  6. Broadband Access Network End Line Sharing Splitter Standard • Describes electrical characteristics of 4 line sharing splitters that may be used to deploy DSL technologies over metallic lines also used to provide voice-band service • Protection for DSL signals from PSTN high frequency transients and impedance effects (ringing, ring-tip, off-hook) • T1 standard completed and currently out for ballot • Type A splitter (based on T1.413-Annex E); Type B considers envelope delay and DSL band attenuation; Type C addresses VDSL and 998 spectrum plan; Type D addresses ISDN BRI service. In-Line Filter Standard • Describes electrical and physical characteristics of an in-line filter to protect voice-band premises equipment from the high frequencies of digital data over voice (25 kHz to 12 MHz range) • Revision of T1.421-2001 adds inter-modulation distortion and transverse balance testing GSC-8, OTTAWA

  7. Broadband Access References • T1.413-1998, T1.413a-2001,Network and Customer Installation Interfaces Asymmetric Digital Subscriber Line (ADSL) Metallic Interface(Revision in ballot) • T1.417-2001, Spectrum Management for Loop Transmission Systems(Revision in ballot) • T1.418-2002, High bit rate Digital Subscriber Line - 2nd Generation (HDSL2/HDSL4) Issue 2(Revision of T1.418-2000) • T1.421-2001,Network to Customer Installation Interfaces - Asymmetric Digital Subscriber Line (ADSL) Metallic Interface(Revision in progress) • T1.424-Trial Use, Interface Between Networks and Customer Installations - Very-high Speed Digital Subscriber Lines (VDSL) Metallic Interface (Trial-Use Standard) GSC-8, OTTAWA

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