Transcript AT&T WorldNet? Dial Access

Engineering AT&T WorldNet Dial
Access
By Dr. Eberhard Wunderlich
October 19, 1998
Slide 1
WNET 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 2
WNET Dial
LEC
Acces s
Network
MODEM
POOLS
Terminal
Servers
AT&T Dial Platform Architecture
EV
COMPLEX
Router
WorldNet Client PC
AT&T
Common
Backbone
Internet
AT&T DP Node
Local Dial Numbers
in 350 + cities
AT&T WorldNet Servers
Slide 3
WNET Dial
AT&T Dial Platform Application Interfaces
NETWORK
CLIENT
•Up to V.90, ISDN
•PPP ( Async & Sync), MPPP
•Acess via Foreign Networks
•IP
Transport
•Async
•PAP
Authentication
•CHAP
•Assigned AT&T Addresses
•Source Address Assurance
•Filters
•Session Timeout
•Idle Timeout
•DNS / WINS Server
Authorization
AT&T
D
I
A
L
P
L
A
T
F
O
R
M
Transport
•PPP over Telnet/TCP
•Telnet Tunnel / TCP Tunnel
Authentication
Authorization
•Domain-Based Routing
•RADIUS
•Proxy to External/ Customer
RADIUS
•Proxy for Incoming RADIUS
•Domain-Based Routing
•RADIUS
•Proxy to External/ Customer
RADIUS
•Proxy for Incoming RADIUS
Accounting
•RADIUS (real-time)
•Call Record Journals
(Billing)
OA&M
•Network Care
•Platform DMOQ’s
•Call Record Journals (stats)
Slide 4
WNET Dial
Engineering Problem Statement
Local Dial Areas
D1
M1
Deploy Modem Pools
M1… MN such that each
provides less than 1%
Blocking.
D2
DN
M2
Initially D1 … DN will
increase rapidly, but are
unknown (Call Holding
Time, Call Arrival Rate)
MN
Minimize incorrect excess
capacity Mi deployments
Slide 5
WNET Dial
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
AT&T WorldNet Dial
Service
Performance
With 1% Blocking
Target
Slide 6
WNET Dial
Dial Platform Network Growth Connects / Service / Month
40,000,000
W o rl dN et
35,000,000
GM S
IN N
PS L
25,000,000
Ho ng K o ng
To tals
20,000,000
15,000,000
10,000,000
5,000,000
AT& T Proprietary
Use Pursuant to Com pa ny Instructions.
Rapid Time to Market Growth
J an
-98
Nov
-97
Sep
-97
J ul97
May
-97
Mar
-97
J an
-97
Nov
-96
Sep
-96
J ul96
May
-96
Mar
-96
J an
-96
0
Nov
-95
To tal Connects
30,000,000
Slide 5
WNET Dial
Slide 7
WNET Dial
Cumulative Percentages of Calls and
Usage Minutes
120
100
Theoretical
Total Calls
Percentage of
80
Total
Calls
60
Total
Minutes
Theoretical
Total Minutes
40
Examples:
80% of all calls last 36 minutes or LESS and consume 23% of overflow minutes
90% of all calls last 66 minutes or LESS and consume 42% of overflow minutes
98% of all calls last 172 minutes or LESS and consume 75% of overflow resources
Therefore:
20
2% of calls (heavy users) consume 25% of overflow resources
0
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150 160 170 180
Call Duration in Minutes
Slide 8
WNET 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 9
WNET Dial
WORLDNET® DIAL ACCESS ARCHITECTURE
- 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
RETURN CIC
LEC
800 DB
LEC
ACCESS
TANDEM
RETURN ROUTING #
AT&T
4ESS
Terminal
Servers
EV
COMPLEX
AT&T Common
Backbone
AT&T
800 DB
OVERFLOW
TO M800
10988 TG
OVERFLOW
TO
FGD
"SECRET"
MODEM
800 #
POOLS
B1/T1
LD MODEM
POOLS
AT&T
4ESS
AUTHEN/
ACCESS
CTRL DB
EV
COMPLEX
Terminal
Servers
WorldNet Client PC
LEC
END
OFFICE
Terminal
Servers
AT&T WN
CLIENT DIALS
LOCAL #
10288 TRUNKS
M800
MODEM
POOL
AT&T DATA CENTER
ISPs
AT&T WorldNet Servers
Slide 10
WNET Dial
LEC Access Path to AT&T Dial Platform
LEC
Switch
1
WorldNet Client PC
Trunks
LEC
Switch
2
Business
Lines
AT&T
LOCAL
MODEM
POOLS
Trunks
LEC
Tandem
Switch
AT&T
OVERFLOW
MODEM
POOLS
Slide 11
WNET Dial
MEGACOM® 800 USE
4,000,000
MEG CALLS (X10)
3,500,000
MEG CALLS (7-DAY AVE)
MEG MIN
3,000,000
MEG MIN (7-DAY AVE)
2,500,000
2,000,000
1,500,000
1,000,000
500,000
1997 - Transition from TTM to TTV
10/3
9/21
9/9
8/28
8/16
8/4
7/23
7/11
6/29
6/17
6/5
5/24
5/12
4/30
4/18
4/6
3/25
3/13
3/1
2/17
0
2/5
SUBSCRIBERS, M EG CALLS, M EG M INUT ES
SUBS
Slide 12
WNET Dial
AT&T Dial Platform Key Statistics
• Services and Domains Currently Supported
Services
AT&T WorldNet
AT&T WVPNS
AIM
AT&T /JENS Roaming
GMS
Login Format/ Domains
[email protected], [email protected]
[email protected], [email protected]
[email protected]
[email protected]
user@…jp, user@…or.jp, user@…attnet.or.jp
[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 13
WNET 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 14
WNET Dial
AT&T WorldNet Current Offer
Pricing Offer
A. $19.95
For 150 Hrs.
Per Mo.
$0.99/Hr. Extra
Customers
Usage
AT&T WorldNet Dial
B. Promotions
for Portal Users/
AT&T LD
Customers
$14.95 For
150 Hrs. Per Mo.
Service
Performance
With 1% Blocking
Target
Slide 15
WNET Dial
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.
MEASURE
AND SCORES
24-HOUR CSR*
EVENING-HOUR CSR*
BUSINESS-HOUR CSR*
AT&T
INDUSTRY AVERAGE
RATINGS AND SCORES
RATINGS
A+ = 98.4%
A+ = 98.1%
A+ = 98.0%
A = 95.6%
A = 93.3%
B = 95.0%
Slide 16
WNET Dial
AT&T WorldNet Improving Performance
Trend
WorldNet Connect Success - Inverse Results -- 24-Hour
Best in Class
AT&T
Industry Avg
8%
7%
Call Failure (%)
6%
5%
4%
3%
2%
1%
0%
Jan-98
Feb-98
Mar-98
Apr-98
May-98
Jun-98
Jul-98
Aug-98
Sep-98
Slide 17
WNET Dial
AT&T WorldNet Improving Performance
Trend
WorldNet Connect Success - Inverse Results -- Evening Peak
Best in Class
AT&T
Industry Avg
12%
Call Failure (%)
10%
8%
6%
4%
2%
0%
Jan-98
Feb-98
Mar-98
Apr-98
May-98
Jun-98
Jul-98
Aug-98
Sep-98
Slide 18
WNET Dial
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
Slide 19
WNET Dial
Integrated Network Management System
Architecture
CBB
DP
INTERNET
GMSNET
Fi rewa l l
G2-Expert
Sy stem
DME - OpenView /
V4.1
Display Svr - 1
G2-Expert
Sy stem
Openview
DB-Server
DME - OpenView /
V4.1
Display Svr - 2
ATM
12 Units
CSO
Ctrl
DME - OV/ V4.1
DME - OV/ V4.1
DME - OV/ V4.1
Disp Svr - 3
Disp Svr - 4
Disp Svr - 5
DP - e Lan Se gm e nt
12 Units
EV
Table
Mgmt
D
N
S
NEMO
12 Units
Call Record
Journal
Harvesting &
Process ing
Bridgeton, MO
WorldNet
Billing
Feed
DP
Metrics
12 Units
12 Units
SYBASE Server
SY BASE Replication Serv er
SYBASE
DB
Repos itory
80GB
Slide 20
WNET Dial
DP Access with TCG
Local Calling Area 1
LEC End
Office
Modem
TCG
Access
Tandem
Direct Trunks
Subscriber
LEC
Access
Tandem
Local Calling Area 2
LEC End
Office
Modem
Subscriber
Local Calling Area 3
LEC End
Office
Modem
Subscriber
s
nk
ru
T
l
ina
PRI
DP
Modems
IP Backbone
F
Joint Engineering Required
-- Single
modem
bundle (TCG)
for multiple local
With
AT&T
Local
calling areas
as well
the LECs.
-- Abilityas
to expand
footprint Trial
through same TCG
switch/ modem
pool to enable
Program
in place
-- Use of shared LEC/TCG trunks for backhaul
Optional
Client Based
-- Migration of modem access from line side to
PRI Collection Tool so that
Data
-- Mutual
Data
can compensation
be obtained on a
Local LEC Switch Basis
LEC Trunks
Mutual Compensation Trunks
End - to - End Measurements
7/29/98
AT&T Proprietary
Use Pursuant to Company Instructions.
Page 1
JJP
Slide 21
WNET 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 22
WNET Dial
The V.90 (56Kbps) Modem Standard
V.90 56Kbps
Modem
Analog
V.34 33.6Kbps
D/A Conversion
(No Quantization Noise)
Digital
Switch
Direct D/D
Mapping
Digital 64Kbps
A/D Conversion
(Quantization Noise)
CB/
Modem
Pool
IP Net.
Internal DSP Modem
Function (Estimating
data from received
analog signal)
Slide 23
WNET 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 24
WNET Dial
Engineering AT&T WorldNet Dial Access
Conclusion
• 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.
Slide 25
WNET Dial