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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

Status Report of Digital Subscriber Line Work in Committee T1

Rick Townsend

T1E1 Chairman

Wayne Zeuch

T1 Vice Chairman

GSC-8, OTTAWA


Status report of digital subscriber line work in committee t1

Broadband Access T1

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


Status report of digital subscriber line work in committee t1

Broadband Access T1

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


Status report of digital subscriber line work in committee t1

Broadband Access T1

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


Status report of digital subscriber line work in committee t1

Broadband Access T1

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


Status report of digital subscriber line work in committee t1

Broadband Access T1

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


Status report of digital subscriber line work in committee t1

Broadband Access T1

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