Engineering AT&T WorldNet Dial Access

1. Engineering AT&T WorldNet Dial Access By Dr. Eberhard Wunderlich October 19, 1998

2. Engineering AT&T WorldNet Dial Access • AT&T Enhanced Dial Platform Architecture • The Time to Market Engineering Challenge • Internet Dial Traffic Characteristics • Current AT&T Enhanced Dial Engineering

3. AT&T Dial Platform Architecture Local Dial Numbers in 350 + cities

4. Transport Transport Authentication Authentication Authorization Authorization Accounting OA&M AT&T Dial Platform Application Interfaces NETWORK CLIENT • Up to V.90, ISDN • PPP ( Async & Sync), MPPP • Acess via Foreign Networks • Async • IP • PPP over Telnet/TCP • Telnet Tunnel / TCP Tunnel AT&T D I A L P L A T F O R M • Domain-Based Routing • RADIUS • Proxy to External/ Customer • RADIUS • Proxy for Incoming RADIUS • PAP • CHAP • Assigned AT&T Addresses • Source Address Assurance • Filters • Session Timeout • Idle Timeout • DNS / WINS Server • Domain-Based Routing • RADIUS • Proxy to External/ Customer • RADIUS • Proxy for Incoming RADIUS • RADIUS (real-time) • Call Record Journals • (Billing) • Network Care • Platform DMOQ’s • Call Record Journals (stats)

5. Engineering Problem Statement Local Dial Areas Deploy Modem Pools M1… MN such that each provides less than 1% Blocking. Initially D1 … DN will increase rapidly, but are unknown (Call Holding Time, Call Arrival Rate) Minimize incorrect excess capacity Mi deployments D1 M1 D2 M2 MN DN

6. AT&T WorldNet Market Launch Offer Pricing Offer A. $19.95 Unlimited Personal Use B. Hourly with 5 Hours/mo. Free for 12 Months Customers Usage Service Performance With 1% Blocking Target AT&T WorldNet Dial

7. Rapid Time to Market Growth

8. Cumulative Percentages of Calls and Usage Minutes

9. Time to Market Solution vs. Time to Volume Solution • Time to Market Solution • Rapidly deploy initial local dial modem pools to meet estimated base capacity requirements • Implement regional and national overflow mechanisms to handle peak demands • Time to Volume Solution • Use established customer traffic trends to engineer local modem pools and serve all traffic via local modems. • Use new AT&T Local (TCG) service for cost optimization.

11. LEC Access Path to AT&T Dial Platform

12. MEGACOM® 800 USE 1997 - Transition from TTM to TTV

13. AT&T Dial Platform Key Statistics • Services and Domains Currently Supported Services Login Format/ Domains AT&T WorldNet user@att.net, user@worldnet.att.net AT&T WVPNS user@company.ics-cug.att.net, user@company.ics-ip.att.net user@company.tpt.att.net AIM user@inetmail.att.net AT&T /JENS Roaming user@…jp, user@…or.jp, user@…attnet.or.jp GMS user@attmail.com, user@mail.att.net • Scope of Deployment • 350+ Local Access Points in the US and Growing • Access Interconnection with UUNET • Global Roaming with Japan ENS • Global WVPN Gateway with Infonet with 34+ Countries • Supports 1.5 Million Users & Projected to Carry 15+ Billion Minutes of Total Usage in 1998

14. Time to Volume Engineering • AT&T WorldNet defined Offer Pricing to deal with Continuous Machine to Machine applications vs. “Personal use” • Engineering moved to a per Local Calling Area Basis, vs. use of Overflow as a Time to Market Mechanism • AT&T Local Service (TCG) used where possible

15. AT&T WorldNet Current Offer Pricing Offer A. $19.95 For 150 Hrs. Per Mo. $0.99/Hr. Extra B. Promotions for Portal Users/ AT&T LD Customers $14.95 For 150 Hrs. Per Mo. Customers Usage Service Performance With 1% Blocking Target AT&T WorldNet Dial

16. Current AT&T WorldNet Results Below is a summary of AT&T and Industry scores for the September 1998 Inverse ISP Benchmark Report. The test period was September 9 through September 23. AT&T INDUSTRY AVERAGE MEASURE RATINGS AND SCORES RATINGS AND SCORES 24-HOUR CSR* A+ = 98.4% A = 95.6% EVENING-HOUR CSR* A+ = 98.1% A = 93.3% BUSINESS-HOUR CSR* A+ = 98.0% B = 95.0%

17. AT&T WorldNet Improving Performance Trend

18. AT&T WorldNet Improving Performance Trend

19. Current Engineering Challenges • Provide Enhanced Real-Time Network Management to Further Improve Performance • Provide Enhanced End-to-End Performance Monitoring • Introduce new Access Methods, including V.90 Modems, XDSL Access and Cable Access

20. Integrated Network Management System Architecture

21. Joint Engineering Required With AT&T Local (TCG) as well as the LECs. Trial Program in place to enable Optional Client Based Data Collection Tool so that Data can be obtained on a Local LEC Switch Basis End - to - End Measurements

22. AT&T WorldNet Dial Access • New Access Options • 56 KBPS Modem Technology • V.90 (Standard based Version of x2™ and K56flex™) implemented • 40-53 KBPS Typical Network to PC rates • V.34 speeds in PC to Network Direction • Access Options in Trial/Planning • XDSL Access • Cable Access

23. The V.90 (56Kbps) Modem Standard D/A Conversion (No Quantization Noise) Direct D/D Mapping V.90 56Kbps Digital Switch CB/ Modem Pool Digital 64Kbps IP Net. Modem Analog V.34 33.6Kbps Internal DSP Modem Function (Estimating data from received analog signal) A/D Conversion (Quantization Noise)

24. Additional Sources of Information • Internet Traffic / Performance Information • Inverse Network Technology http://www.inversenet.com/ • IEEE Communications Magazine • 56 Kbps Modems and the V.90 Standard • Humblet, P.A., Troulis, M.G., The Information Driveway, IEEE Communications Magazine, Dec. 1966, pp64-68. • ITU Drafts and Standards http://www.itu.int • AT&T WorldNet Services • http://www.att.com or http://www.att.net/

25. Engineering AT&T WorldNet Dial AccessConclusion • Successful Engineering of AT&T WorldNet Dial Access required different approaches for Time to Market vs. Time to Volume. • Engineering is a continuous process requiring continuous improvement to provide Best in Class Performance.