Transcript Why do Telcos use ATM

Why do Telcos use ATM
Alcatel®
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wael hassan@alcatel
Power of ATM
• ATM is great because its carrier grade
severs have an uptime of 99.99999 %
• ATM is great for Data/Voice integration.
• Billing and Qos in ATM do not exist in any
other protocol.
• ATM is mostly connected to optical
interfaces.
wael hassan@alcatel
Voice + Data: Next Generation Public Network
POTS
Wireless
Class 4/5
Circuit Switching
SS7 Signaling
Voice
IP
data
VoIP
Internet
Intranets
Extranets
Router
Store & Forward
In-band Signaling
New
public
network
Network
access
VoFR
VoATM
Legacy
data
IP/FR
IP/ATM
TDM, FR and
ATM
ATM
Cell Switching
ATM Signaling
Transport
wael hassan@alcatel
A Proven Approach —
Building on our Strengths
SS7, call server
technology
Access technologies
(xDSL, LMDS, PON etc.)
Service
management
QoS
Scalability
Voice and data
convergence
Network
management
Traffic management
Multiservice
delivery
Multiprotocol
core backbone
MPLS
Service flexible
edge router
VPNs
IP forwarding
IP routing
wael hassan@alcatel
Multiservice
multi-access node
Two Worlds Converging
Voice
Leased
lines
Frame Relay
ATM
VPNs
Internet
Internetservice
networks
Full-service
networks
MPLS and
ATM
MPLS instead
of ATM
• Maintain the
services
• Start with next
generation
infrastructure
• Evolve the
infrastructure
• Tend to be
technologyagnostic
Application
services
• Evolve the
services
• Router-centric
wael hassan@alcatel
Why Has ATM Been Used?
• To address operational
and engineering issues
Path
Management
– reliability and availability
– multiservice capability
– performance
Fault
Management
Accounting/Billing
– manageability
ATM
Connections
– relative maturity
• Where?
– switched data network
backbones
Service
Interworking
Traffic
Management
Performance
Management
– full-service providers
wael hassan@alcatel
Redundancy/
Availability
Next Generation Networking
Portfolio
•
•
Multiservice platform is today’s
QoS-capable infrastructure
Multiservice platform evolves
to multiprotocol core
–
•
•
IP
Edge
ATM and IP/MPLS
ATM for multiservice and
high-value services
–
QoS
–
fault management
–
service differentiation
MPLS for growing IP services
–
7420
ESR
Public
Internet
IP
VPNs
reach and ubiquity
wael hassan@alcatel
Multiprotocol
Core
ATM, IP, MPLS
7670 RSP
Voice
Services
Voice
Transport
MSP
Edge
7470
MSP
Leased
Lines
Virtual
circuits
Lead Applications
• Lead applications based on target market
needs
–
–
–
–
Scaling ATM networks — what we know best
DSLAM aggregation — Alcatel installed base
ATM core for IP networks — the necessary evil
VTOA core — it’s happening
wael hassan@alcatel
DSLAM Example 1-3 Descriptions
• Requirement for aggregation of DSLAM OC-3/STM1 access
• High density and small footprint key issues for CLECs
and ASPs
DSLAM
nxOC-3/STM-1 ATM
OC-12/STM-4 and
OC-48/STM-16
trunking
DSLAM
.
.
.
DSLAM
wael hassan@alcatel
Analyst Projections
RHK believes that the migration to a new packet switched voice
infrastructure will be driven by two divergent market requirements:
IP Offload: Incumbent service providers require more efficient switching solutions
to offload voice-band internet traffic from the PSTN core. Eliminating backbone
switch congestion caused by internet traffic will serve as the springboard for future
integration of all services onto a packet based infrastructure.
Service Differentiation: Creating a new, open platform for voice telephony
services will facilitate the development of new enhanced services. This
functionality will be important in enabling service providers to differentiate their
offerings.
Source: RHK; New Voice Infrastructures October 1999
wael hassan@alcatel
Voice Revenue VS Data Revenue
94,245
In USD billions
2002
2001
2000
18,514
1999
Data Revenues
Fixed Line Voice Revenues
4,677
1998
Voice Revenue
17% growth
43,214
1997
Data Revenue
32% growth
100,000
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
Year
Source: IDC 1999 WAN survey
wael hassan@alcatel
Today’s “care-abouts” for Voice Data
Convergence
ILEC issues
Bell Canada, BT, etc..
• Backbone optimization:
•Migration of the PSTN
Trunking Network
•Offload Internet traffic
CLEC issues
Small Carriers
• Interconnect to ILEC
and ISPs
• Optimize use of
resources
• Differentiable Services
Support Voice,
Build for Data
wael hassan@alcatel
PSTN Offload: Business Rationale
• Internet Dial traffic has lead to congestion into
some parts of the trunk network
– Dial-up subscribers increasing
– Average hold times quadruple
• ILECs need to invest in PSTN switches
– Add capacity for internet ‘calls’
– oversubscription rules change, need more capacity to
avoid busy signals
• But, why add expensive voice-switch capacity
for dial-up data calls?
– Cap & grow voice switch expenditures, build-out data
hassan@alcatel
network to supportwael
internet
calls
Voice Network (PSTN) Data Offload
LEC
Voice
switch
As dialup traffic
increases, more network
capacity is required
Congestion formed here
could be alleviated by adding more
capacity to voice switches,
Congestion!
Voice
Network
LEC
Voice
switch
LEC
Voice
switch
ISP 1
ISP 2
Dial Server
LEC
Voice
switch
But why add voice capacity for data users?
wael hassan@alcatel
ISP 3
Alcatel Solution
5424
Call Signaling
Gateway
SS7
LEC
Voice
switch
Voice
Calls
Using Alcatel’s Access and SS7 Gateways,
voice calls use the voice network...
Voice Network
ISP 1
Alcatel 7410
Access Server
…and dialup data calls
use the data network.
ISP 2
Data Network
wael hassan@alcatel
ISP 3
CLEC Call Grooming
Traditional CLEC Interconnect Scenario
SS7
SS7
PSTN
AS
PC
Voice
switch
ISP 2
AS
Voice
switch
AS
ISP 3
Alcatel Solution
SS7
PC
ACSG
Voice
switch
Onestream Access
Server
ISP 1
ISP 1
Voice
switch
• Requires voice
switching capacity
for 100% of calls
• Majority of traffic
is dialup
• Increased
CAPEX/OPEX for
Data operations
 Alcatel Call Signaling Gateway
(ACSG) signals SS7 traffic
ISP 2
 Voice switch handles only voice
calls, can be centrally located
ISP 3
wael hassan@alcatel  Better ROI for data services