WNET Dial

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Engineering ATT WorldNet Dial Access

• By Dr. Eberhard Wunderlich
• October 19, 1998

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Engineering ATT WorldNet Dial Access

• ATT Enhanced Dial Platform Architecture
• The Time to Market Engineering Challenge
• Internet Dial Traffic Characteristics
• Current ATT Enhanced Dial Engineering

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ATT Dial Platform Architecture
Local Dial Numbers in 350 cities
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ATT Dial Platform Application Interfaces
CLIENT
NETWORK

• Up to V.90, ISDN
• PPP ( Async Sync), MPPP
• Acess via Foreign Networks
• Async

• IP
• PPP over Telnet/TCP
• Telnet Tunnel / TCP Tunnel

ATT 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 ATT 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 DMOQs
• Call Record Journals (stats)

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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
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ATT 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
ATT WorldNet Dial
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Rapid Time
to Market Growth
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Cumulative Percentages of Calls and Usage Minutes
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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 ATT Local (TCG) service for cost
  optimization.

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(No Transcript)
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LEC Access Path to ATT Dial Platform
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MEGACOM 800 USE
1997 - Transition from TTM to TTV
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ATT Dial Platform Key Statistics

• Services and Domains Currently Supported
• Services Login Format/ Domains
• ATT WorldNet user_at_att.net,
  user_at_worldnet.att.net
• ATT WVPNS user_at_company.ics-cug.att.net,
  user_at_company.ics-ip.att.net
• user_at_company.tpt.att.net
• AIM user_at_inetmail.att.net
• ATT /JENS Roaming user_at_jp, user_at_or.jp,
  user_at_attnet.or.jp
• GMS user_at_attmail.com, user_at_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

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Time to Volume Engineering

• ATT 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
• ATT Local Service (TCG) used where possible

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ATT WorldNet Current Offer
Pricing Offer A. 19.95 For 150 Hrs. Per Mo.
0.99/Hr. Extra B. Promotions for Portal
Users/ ATT LD Customers 14.95 For 150 Hrs.
Per Mo.
Customers
Usage
Service Performance With 1 Blocking Target
ATT WorldNet Dial
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Current ATT WorldNet Results
Below is a summary of ATT and Industry scores
for the September 1998 Inverse ISP Benchmark
Report. The test period was September 9 through
September 23. ATT 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
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ATT WorldNet Improving Performance Trend
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ATT WorldNet Improving Performance Trend
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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

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Integrated Network Management System Architecture
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Joint Engineering Required With ATT 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

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ATT 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

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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)
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Additional Sources of Information

• Internet Traffic / Performance Information
• Inverse Network Technology http//www.inversenet.c
  om/
• 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
• ATT WorldNet Services
• http//www.att.com or http//www.att.net/

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Engineering ATT WorldNet Dial AccessConclusion

• Successful Engineering of ATT 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.