NRIC V FG3 - Wireline Network Spectral Integrity Status & Recommendations

1. NRIC V Network Reliability and Interoperability Council Focus Group 3Wireline Network Spectral Integrity Status Report and RecommendationsJune 26, 2001 Ed Eckert, Chair, Focus Group 3 Phil Kyees, Chair, Spectrum Management Subcommittee Massimo Sorbara, Chair, Spectrum Compatibility Subcommittee

2. What has FG3 done since the February 2001 Council meeting? • Six days of face-to-face meetings; • Liaisons to key standards development organizations; • Reviewed and considered 12 individual contributions towards the FG goals; • Work towards White Paper on Intermediate Transceiver Units: “Remote Deployed DSL: Advantages, Challenges, and Solutions” • Work towards recommendation on SM information exchanges between equipment manufacturers, loop owners and service providers. NRIC V FG3 - Status & Recommendations

3. Title & Mission Statement • NRIC V, Focus Group 3 shall be Titled “Wireline Network Spectral Integrity” • The Mission of the Wireline Network Spectral Integrity (WNSI) Focus Group is to provide recommendations to the FCC and to the telecommunications industry that, when implemented, will: • ensure the integrity of coexisting services in wireline public telecommunications networks; • facilitate widespread and unencumbered deployment of xDSL and associated wireline high speed access technologies, and; • encourage network architecture and technology evolution that safeguards the integrity of wireline public telecommunications networks while maximizing capacity, availability and throughput in an unbundled/competitive environment. NRIC V FG3 - Status & Recommendations

4. Intermediate TU Issues Repeaters in the loop plant Spectrum Compatibility of Digital Loop Carrier (DLC) based signals with Central Office (CO) based signals Effect of Intermediate TU-Cs Multiple Locations Administration of Loops and Technologies in Binders Grandfathering vs. Sunsetting services/technologies Measuring and reporting if particular loop is qualified for a specific spectrum management class (loop length, bridge taps) Measuring & Reporting Loop Parameters for use in xDSL Loop Qualification Equivalent Working Length (EWL), Loop Length, Bridged Tap Reporting Technologies Definition of Known Disturbers Bi-directional Disclosure of Spectrum Management Class and PSD Effectiveness of rules and mechanisms for binder group management and interference in dispute resolution Equipment Registration Application of Part 68 to xDSL TU-R (Customer Located Equipment) Certification/registration of xDSL TU-C Equipment to published Technical Requirements New Technology Frequency Planning for advancement of high-speed services in the loop plant Short Term Stationary Systems xDSL technology evolution to promote long term spectral integrity Line Sharing POTS Quality Data Quality Metallic Test Access Fault Management Splitter Ownership Splitter Physical and Electrical Location Ingress/Egress issues Metallic Balance in Network and Customer wiring Effect of In-premises Signals on Wireline Network In-Premises Wireline Transmitters Co-Located TU Compatibility Spectrum Compatibility of Co-located xDSL Transceivers TU-Cs at CO TU-Cs at RT Contribution Categories NRIC V FG3 - Status & Recommendations

5. Service Providers AT& T: Tom Shen BellSouth: Gary Tennyson Covad: David Rosenstein Previously Anjali Joshi Qwest: Jamal Boudhaouia Previously Mary Retka Rhythms: David Reilly SBC: Gene Edmon Sprint: Pete Youngberg Verizon: Greg Sherrill WorldCom: Paul Donaldson Note that Northpoint invitee never attended and that invitee Prism is no longer in business. Equipment Suppliers Adtran: Kevin Schneider Elastic Networks: Patrick Stanley Texas Instruments: Jim Carlo Lucent: Harry Mildonian SME’s & Sponsor Organizations • Leadership • Globespan: Massimo Sorbara • Paradyne: Phil Kyees • Catena Networks: Ed Eckert • FCC • Paul Marrangoni NRIC V FG3 - Status & Recommendations

6. Status of Technical Standards Development and Implementation • Committee T1’s Technical Subcommittee T1E1 has now completed the first “American National Standard - Spectrum Management for Loop Transmission Systems” approved by ANSI as T1.417 on 1/1/2001. Available 3/1/01 at www.atis.org. • Standards for: Inline Filters (for splitterless DSL) and Network End Splitters to be balloted by Committee T1 in June. • VDSL standards targeted for default letter ballot in August. • Effort on Dynamic Spectrum Management (DSM) has begun. • Joint work between T1E1.4 and TR41.9 on ACTA (Part 68) issues: • T1E1.4 will be responsible for developing a recommendation on the installation of ADSL splitters in homes having alarms/security systems. Call for contributions has been made. • Joint work to identify appropriate sections of T1.417 “Spectrum Management” for inclusion in a future issue of TIA-968. NRIC V FG3 - Status & Recommendations

7. Status of Technical Standards Development and Implementation • T1E1.4 continues work on Issue 2 of T1.417, with discussions and contributions being focused on the spectral compatibility of Central Office based DSL with Remote Terminal based DSLs and Repeaters (a.k.a “intermediate transceiver units” (TUs)). • Target is to have draft Issue 2 out for letter ballot in 4Q2001. • Format (i.e. delta document, addendum, or a completely new version) for Issue 2 is not yet clear, however any changes will be normative. • Topics for consideration in Issue 2 include: • Revision of non-DSL out-of-band metallic and longitudinal signal power limits to provide an adequate level of protection for DSL systems. • Addition of VDSL to the basis systems list. • Extension of spectrum management class 5 upstream band to lower frequencies. • Methods for optimizing PSDs, maximizing throughput and binder group capacity. • Trade-offs between loop length guidelines and spectral characteristics. • The susceptibility of some deployed systems to short term stationary crosstalk. • Spectral compatibility with T1.419 (splitterless ADSL) basis systems. NRIC V FG3 - Status & Recommendations

8. Recommendations • General information: • An update on actions towards the goals of the original recommendations is included in this presentation. • Today, we do not have any new or revised recommendations to bring to the Council for approval. • Additional recommendations and at least one white paper are targeted for the October Council meeting. • White Paper on Intermediate Transceiver Units: “Remote Deployed DSL: Advantages, Challenges, and Solutions” • Recommendation on Spectrum Management information exchanges between equipment manufacturers, loop owners and service providers. NRIC V FG3 - Status & Recommendations

9. Status: FG3 Recommendations #1 - #2 • In August 2000, FG3 put forward four recommendations. Shown below is an update on actions towards their goals: • Rec #1 - New Technology, Frequency Planning: • Revision to original recommendations approved in February 2001; • Means of “FCC Endorsement” of Band Plan 998 is still unclear; • Timing for inclusion of Band Plan 998 in Issue 2 of T1.417 is now. • Rec #2 – Ingress/Egress Issues; In-Premises Wireline Transmitters: • The ITU-T is developing technical requirements for an isolation device; it is presumed that such technical requirements would be adopted by a US standards development organization. • We expect to report further on this at the next council meeting. NRIC V FG3 - Status & Recommendations

10. Status: FG3 Recommendations #3 - #4 • Rec #3: - Equipment Registration, Application of Part 68 to xDSL TU-R (Customer Located Equipment): • Formation of ACTA (Administrative Council on Terminal Attachments) is moving forward under ATIS and the TIA, first meeting was May 2, 2001; • Work towards moving Part 68 Technical Requirements to “ANSI 68” has started in TIA TR41; T1E1 will provide advice on this and further updates to the proposed “ANSI TIA-968”. • Rec #4 - Intermediate TU Issues: • Priority of this issue is shown in T1E1 by the fact that nearly all of the contributions towards T1.417 Issue 2 are intended to help bring resolution to this issue. NRIC V FG3 - Status & Recommendations

11. Status: FG3 Recommendations #5 - #6 • Rec #5: - Line Sharing Test Access • No further information. • Rec #6 - Intermediate TU Issues – Remote DSL: • New recommendation prepared by FG3 was partially approved in February; • One part of the originally proposed recommendation was remanded to FG3 for further consideration; • Since no consensus on the language for this aspect of the recommendation could be attained, it was agreed that a white paper would be produced. This paper is in development and will describe, in a factual way, the many complexities of Remote DSL deployment. It is not intended to provide conclusions or recommendations around the facts. NRIC V FG3 - Status & Recommendations

12. On May 8, 2001 Service Providers Covad, Rhythms and WorldCom sent a letter to NRIC Chairman James Crowe and NRIC Designated Federal Officer Kent Nilsson, stating that they will not continue to participate in Focus Group 3. Focus Group 3 is committed to its mission and will continue to provide the industry and the FCC with information on Wireline Network Spectral Integrity that will promote deployment of Advanced Services in a competitive environment. Participation Issue NRIC V FG3 - Status & Recommendations

13. FG3, with the support of the FCC Common Carrier Bureau, respectfully requests that Covad, Rhythms and WorldCom reconsider their action to withdraw their participation. The Focus Group stands ready, as always, to institute changes to promulgate the renewed participation by these service providers. FG3 looks forward to Covad, Rhythms and WorldCom contributions towards development of the White Paper on Remote DSL as well as further recommendations. Participation Issue NRIC V FG3 - Status & Recommendations

14. Special Thanks To: • Young Carlson, FCC Administrative Assistant for her excellent work on meeting logistics. • Kent Nilsson (FCC), Designated Federal Officer to NRIC V and Paul Marrangoni (FCC) for their ongoing guidance on, and encouragement of, Focus Group initiatives. • Our meeting hosts: Catena Networks and Paradyne. • Our volunteer Subject Matter Experts, especially those who have taken on extra assignments. NRIC V FG3 - Status & Recommendations

15. Recommendations #6 (Backup info only) Recommendation #6: Intermediate TU Issues – Remote DSL • Background: See Appendix D for background. • Recommendation: • Focus Group 3 recommends that T1E1’s continuing work on spectrum management standards embrace, as a whole, the background and recommendations contained herein. • As a preventative measure, the industry should be encouraged to employ available transmit power management mechanisms to minimize the effect of FEXT from remote deployments. One method that has been proposed to do this for ADSL modems is to limit the maximum noise margin per tone to the smallest value where data performance is not affected – this effectively results in tones with lower transmit power and/or fewer tones used. While this will undoubtedly reduce the amount of FEXT caused by remote ADSL, the benefits to be gained from this recommendation are under study. Furthermore, we recommend that industry standards bodies incorporate and require implementation of appropriate transmit power management mechanisms in future DSL standards, and that T1E1 incorporate and encourage the use of transmit power management mechanisms in future spectrum compatibility standards. • We recommend that the FCC consider the following in future rulemaking on the issue of remote ADSL deployments: Where remote and central office ADSL deployments will serve customers with loops in the same distribution cable, providers of remote deployments should provide means for accommodating CO-based deployments. Whether this accommodation should be done in a preventative or remedial manner depends on the projected exposure or expected rate of trouble occurrence. If an analysis of the exposure suggests that significant spectral compatibility problems are likely, CO-based ADSL should be accommodated in a preventative manner, as part of the remote ADSL deployment. The extent of this exposure is currently under study in FG3. Therefore, both the strategy (preventative or remedial) and the means (e.g. co-location, derived circuits, amplifiers, etc.) of accommodation will be the subject of future recommendations by FG3. This bullet remanded to FG3 for further consideration. NRIC V FG3 - Status & Recommendations