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Slide 1WNET Dial
Engineering AT&T WorldNet Dial Access
By Dr. Eberhard Wunderlich
October 19, 1998
Slide 2WNET Dial
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
Slide 3WNET Dial
AT&T Dial Platform Architecture
LECAccessNetwork AT&T
CommonBackbone
Internet
EVCOMPLEX
MODEMPOOLS
WorldNet Client PC
AT&T WorldNet Servers
Term
inal
Serv
ers
Router
AT&T DP Node
Local Dial Numbersin 350 + cities
Slide 4WNET Dial
AT&T Dial Platform Application Interfaces
Authorization
OA&M
Accounting
Authentication
Transport
Authorization
Authentication
Transport AT&TDIAL
PLATFORM
CLIENT NETWORK•Up to V.90, ISDN
•PPP ( Async & Sync), MPPP
•Acess via Foreign Networks
•Async
•PAP
•CHAP
•Assigned AT&T Addresses•Source Address Assurance•Filters•Session Timeout•Idle Timeout•DNS / WINS Server
•IP
•PPP over Telnet/TCP
•Telnet Tunnel / TCP Tunnel
•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)
•Domain-Based Routing•RADIUS•Proxy to External/ Customer RADIUS•Proxy for Incoming RADIUS
Slide 5WNET Dial
Engineering Problem Statement
M1
M2
MN
D1
D2
DN
Deploy Modem PoolsM1… 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 excesscapacity Mi deployments
Local Dial Areas
Slide 6WNET Dial
AT&T WorldNet Market Launch Offer
AT&T WorldNet Dial
Pricing Offer
A. $19.95Unlimited Personal Use
B. Hourly with5 Hours/mo.Free for 12Months
Usage Service Performance With 1% BlockingTarget
Customers
Slide 7WNET Dial
Rapid Time to Market Growth
Slide 8WNET Dial
Cumulative Percentages of Calls and Usage Minutes
0
20
40
60
80
100
120
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180
Call Duration in Minutes
Perc
en
tag
e o
f
Total Minutes
Total Calls
TheoreticalTotal Calls
TheoreticalTotal Minutes
Examples:80% of all calls last 36 minutes or LESS and consume 23% of overflow minutes90% of all calls last 66 minutes or LESS and consume 42% of overflow minutes98% of all calls last 172 minutes or LESS and consume 75% of overflow resourcesTherefore:
2% of calls (heavy users) consume 25% of overflow resources
Slide 9WNET Dial
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.
Slide 10WNET Dial
LECACCESSTANDEM
AT&T4ESS
AT&T4ESS
LECEND
OFFICE
LEC800 DB
FGDMODEMPOOLS
AUTHEN/ACCESSCTRL DB
AT&T CommonBackbone
AT&T DATA CENTER
ISPs
AT&T800 DB
EVCOMPLEX
LD MODEMPOOLS
EVCOMPLEX
M800MODEM
POOL
AT&T WNCLIENT DIALSLOCAL # OVERFLOW
TO"SECRET"800 #
10988 TG
10288 TRUNKS
OVERFLOWTO M800
RETURN CIC
RETURN ROUTING #
WORLDNET® DIAL ACCESS ARCHITECTURE
B1/T1
- FIRST TRY B1/T1 TO LOCAL DIAL MODEM POOL- OVERFLOW ON 10988 TRUNKS TO FGD MODEM POOL (IF AVAILABLE)- OVERFLOW ON 10288 TRUNKS TO M800 MODEM POOL
WorldNet Client PC
AT&T WorldNet Servers
TerminalServers
Term
inal
Serv
ers
Term
inal
Serv
ers
Slide 11WNET Dial
LEC Access Path to AT&T Dial Platform
LECSwitch
1
AT&TLOCAL
MODEMPOOLS
BusinessLines
WorldNet Client PC
AT&TOVERFLOW
MODEMPOOLS
LECSwitch
2
LECTandemSwitch
Trunks
Trunks
Slide 12WNET Dial
MEGACOM® 800 USE
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
2/5
2/1
7
3/1
3/1
3
3/2
5
4/6
4/1
8
4/3
0
5/1
2
5/2
4
6/5
6/1
7
6/2
9
7/1
1
7/2
3
8/4
8/1
6
8/2
8
9/9
9/2
1
10
/3
SU
BS
CR
IBE
RS
, ME
G C
AL
LS
, ME
G M
INU
TE
S
SUBS
MEG CALLS (X10)
MEG CALLS (7-DAY AVE)
MEG MIN
MEG MIN (7-DAY AVE)
1997 - Transition from TTM to TTV
Slide 13WNET Dial
AT&T Dial Platform Key Statistics
• Services and Domains Currently SupportedServices Login Format/ Domains
AT&T WorldNet [email protected], [email protected]
AT&T WVPNS [email protected], [email protected]
AT&T /JENS Roaming user@…jp, user@…or.jp, user@…attnet.or.jp
GMS [email protected], [email protected]
• 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
Slide 14WNET Dial
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
Slide 15WNET Dial
AT&T WorldNet Current Offer
AT&T WorldNet Dial
Pricing Offer
A. $19.95For 150 Hrs.Per Mo. $0.99/Hr. Extra
B. Promotions for Portal Users/AT&T LD Customers$14.95 For 150 Hrs. Per Mo.
Usage Service Performance With 1% BlockingTarget
Customers
Slide 16WNET Dial
Current AT&T WorldNet Results
Below is a summary of AT&T and Industry scores for the September 1998 Inverse ISPBenchmark Report. The test period was September 9 through September 23.
AT&T INDUSTRY AVERAGEMEASURE RATINGS AND SCORES RATINGS AND SCORES24-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%
Slide 17WNET Dial
AT&T WorldNet Improving Performance Trend
WorldNet Connect Success - Inverse Results -- 24-Hour
0%
1%
2%
3%
4%
5%
6%
7%
8%
Jan-98 Feb-98 Mar-98 Apr-98 May-98 Jun-98 Jul-98 Aug-98 Sep-98
Cal
l Fai
lure
(%
)
Best in Class AT&T Industry Avg
Slide 18WNET Dial
AT&T WorldNet Improving Performance Trend
WorldNet Connect Success - Inverse Results -- Evening Peak
0%
2%
4%
6%
8%
10%
12%
Jan-98 Feb-98 Mar-98 Apr-98 May-98 Jun-98 Jul-98 Aug-98 Sep-98
Cal
l Fai
lure
(%
)
Best in Class AT&T Industry Avg
Slide 19WNET Dial
• 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
Current Engineering Challenges
Slide 20WNET Dial
Integrated Network Management System Architecture
DME - OpenView /V4.1Display Svr - 2
OpenviewDB-Server DME - OV/ V4.1
Disp Svr - 3
DME - OpenView /V4.1
Display Svr - 1
G2-ExpertSystem
GMSNET
DP
Firewall
INTERNET
G2-ExpertSystem
CBB
DME - OV/ V4.1 DME - OV/ V4.1
Disp Svr - 4 Disp Svr - 5
ATM DP - eLan Segment
SYBASEDB
Repository80GBBridgeton, MO
SYBASE Server
DNS
EVTableMgmt
SYBASE Replication Server
CSOCtrl
Call RecordJournal
Harvesting &Processing
WorldNetBillingFeed
DPMetrics
NEMO
12 Units 12 Units 12 Units 12 Units 12 Units
Slide 21WNET Dial
Joint Engineering RequiredWith AT&T Local (TCG)as well as the LECs. TrialProgram in place to enableOptional Client Based Data Collection Tool so thatData can be obtained on a Local LEC Switch Basis
End - to - End Measurements
Slide 22WNET Dial
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
Slide 23WNET Dial
The V.90 (56Kbps) Modem Standard
Modem DigitalSwitch
CB/Modem
PoolIP Net.Analog
Digital 64Kbps
D/A Conversion(No Quantization Noise)
A/D Conversion(Quantization Noise)
Direct D/DMapping
Internal DSP ModemFunction (Estimatingdata from receivedanalog signal)
V.90 56Kbps
V.34 33.6Kbps
Slide 24WNET Dial
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/
Slide 25WNET Dial
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.
