1. Migration to All-IP Networks: Directions and Deployment
Customers’ Event
Crete, May 2007
Migration to All-IP Networks: Directions and Deployment
Presented by:
Dr. Yuri Gittik
Chief Strategy Officer

2. Outline All-IP” Networks: The Approach IP Transformation
Focus on Access and Metro
Incremental Deployment – Leveraging Existing Infrastructures

3. Towards “All-IP” Networks
IP traffic prevails the applications– IP for voice and data services
VoIP and soft-switches for voice services
Internet access and IP VPN services
Pseudowire solutions for Ethernet and legacy Layer 1/2 services
New IP-based services: IPTV, N-play
Fixed-mobile convergence
“Access-agnostic” services for wireline and mobile customers
IMS SIP-based services (“push-to-x”)
IP/MPLS infrastructure
IP DSLAMs, PSN backhaul, metro and core networks
It’s all about money: €conomy- not technology!
Reduced opex with high economy of scale
Reduce the number of different networks and infrastructures
Flexibility with existing and new services

4. BT’s 21CN Network Evolution
From multi-networks to a multi-service network
Fewer network elements
Simpler service management
Rapid implementation

5. Drivers for the 21st Century Network
Power to
Customers – increased flexibility and greater reliability
Speed to Market
- innovative
services
Investing now for future £1B annual cash savings
Cost Transformation
- significant reduction in operating costs
for
More
Less

6. Migration to “All-IP” Networks: Still Open Issues
IP transformation
Maintain legacy traffic (mainly business and mobile)
Focus on access and metro
From DSLAM to MSAN
Ethernet metro
Incremental deployment – leveraging existing infrastructures
First of all, SDH infrastructure
And many others…

7. Outline All-IP” Networks: The Approach IP Transformation
Focus on Access and Metro
Incremental Deployment – Leveraging Existing Infrastructures

8. IP Transformation: Legacy over PSN
Network Core
Access/Backhaul
Services/CPE
Legacy Services Existing Equipment
ATM DSLAM
Legacy
Networks
SDH, ATM
2G BTS
3G NodeB
New Services and Equipment
New
Packet-Switched
Networks
GbE, MPLS, IP
IP DSLAM
IP RAN
4G NodeB
Maintain legacy traffic over new packet-switched infrastructures
TDM, ATM, voice, …
A broad traffic range: residential and business services, 2G/3G mobile traffic
Domestic and international coverage

9. "Classic" Edge-to-Edge Pseudowires
Emulation of native Layer 1/Layer 2 services, such as TDM, Frame Relay, ATM or Ethernet, over a packet-switched core network (IP/MPLS)
Enables transport of a native service over IP/MPLS tunnels
Emulation is performed by provider edge devices (PE)
The individual service emulations in this approach are termed pseudowires
RAD pioneered “pre-pseudowire” TDMoIP in 1999 and leads the pseudowire standardization and implementation
PW Encapsulation Function
PW Encapsulation Function
Customer
Premises
Customer
Premises PE PE
CPE
IP/MPLS
Attachment Circuit
Native Service
Attachment Circuit
Native Service
CPE PW PW

10. Broadening the Pseudowire Approach
Network Segment
Access
Core
N/A
Extended Pseudowires/Emulation
“Classic” Pseudowires
IP/MPLS
Infrastructure
Platforms
Ethernet
IAD+DSLAM
(MSAN)
Note: Metro segment could be considered as a part of the access network, or, alternatively, associated with the core network

11. 3GPP Development: More IP/MPLS
RAN
Core
Revisions
Control Entity
Iub TNL
Iucs TNL
Iups TNL
Voice Core
Data Core
R99
Separate RNC
ATM
ATM/TDM
IP/MPLS
Rev.4 IP
Rev.5
ATM or IP
Rev.6
Rev Not final
Distributed functionality between separate NodeB and RNC
LTE: Rev.8+ Not final
No separate control nodes

12. Mobile Backhauling: Towards IP-centric Infrastructure
Milestone 1. Legacy (TDM and ATM-based) cellular voice+data traffic over PSN infrastructure including backhauling
Pseudowire solutions with optional clock recovery
Incremental migration to “all-IP” and IMS solutions
Mainly in the core, not backhaul infrastructure, yet with some impact on backhauling
Milestone 2. IP-based cellular voice+data traffic over PSN infrastructure including backhauling
Regular IP solutions with some cellular-specific implementations
IMS solutions are expanding into the multi-technology access
TISPAN is adding functional sub-system for enhanced control of network resources
“Grey area”

13. Backhaul Evolution Towards IP
Evolution steps
Pre-provisioned (w/o control plane) traffic-agnostic transport (TDM, ATM)
Pre-provisioned (w/o control plane) traffic-aware transport
Abis optimization, data compression, …
[Traffic-aware] transport with control plane
Network control plane (IP/MPLS-based), optionally service-aware
Service control plane (IP/IMS-based)
Next steps?
Access “collapsing” when controller nodes (not entities!) are eliminated
From Backhaul (radio sites-controller)+ Aggregation (controllers-edge node) to Access (radio sites-edge/core node)   ? ? ? ?

14. Outline All-IP” Networks: The Approach IP Transformation
Focus on Access and Metro
Incremental Deployment – Leveraging Existing Infrastructures

15. 21CN Network Architecture
CMSAN – Copper MSAN
FMSAN – Fiber MSAN

16. ngDSLAM/MSAN: Typical Deployment Scenario
Initial Stage: DSLAM platform with strong focus on residential services (and optional PSTN migration)
Use standard commodity IAD and CPE
Low importance of fiber access
Basic services (voice, Internet access)
Next Stage: Broadening the focus
More focus on business customers
Access over DSL and fiber
Maintaining traditional services (leased lines, ATM)
Dedicated smart NTU and multiservice CLE for new and traditional services
Cellular backhaul applications
And now adding IPTV services…
Just to add more details about FCD-155. This product allows to enhance SDH networks with NG ADM capabilities: GFP, virtual concatenation with LCAS.

17. To Ensure Really Multiservice MSAN
Customer Premises
Single/multiple
Copper Fiber
IAD
PBX
CO/POP
3G NodeB
Ethernet
Metro
IP/MPLS
ATM
Access
Gateway
Single/multiple
Copper
ngDSLAM
MSAN
TDM
2G BTS
Radio Site
Customer Premises
NTU/CLE
PBX
Fiber
Adding a range of smart NTU/CLE products to the MSAN platform
Access over xDSL and fiber links
Optional pseudowire technologies to support legacy traffic
More focus on direct (fiber) access to Metro Ethernet
Point-to-point and point-to-multipoint (GPON)

18. Ethernet Metro: Too Many Options?
Ethernet over legacy networks (SDH, ATM)
MPLS-based Ethernet metro
New alternative [emerging] technologies
Transport MPLS (T-MPLS) – Alcatel, more?
PBB-TE (former PBT) – Nortel, BT, NSN, (RAD?)
Yet a clear consensus on the requirements for end-to-end Ethernet services
Smart termination and service demarcation are essential
Ethernet OAM, traffic handling, protection, …
E-NTU

19. Outline All-IP” Networks: The Approach IP Transformation
Focus on Access and Metro
Incremental Deployment – Leveraging Existing Infrastructures

20. Leveraging Existing Infrastructure
Network Core
Access/Backhaul
Services/CPE
Legacy Services Existing Equipment
ATM DSLAM
Legacy
Networks
SDH, ATM
2G BTS
3G NodeB
New Services and Equipment
New
Packet-Switched
Networks
GbE, MPLS, IP
IP DSLAM
IP RAN
4G NodeB
How to take advantage of existing infrastructures?
Ethernet/IP services over:
SDH: Ethernet over SDH (DTAG, Telenor, …)
ATM: Ethernet over ATM (FT, DTAG, …)

21. T-COM: Bottom Up from SDH

22. Telenor: “All-IP 2010” Network
Distribution
Ethernet/ngSDH
Core
IP/MPLS
Higher capacity
Fewer technologies
Seamless services
IP-based service platform with open standards and common interfaces
Common service edge
Ethernet interfaces
All access types
SDH
Point-to-point
radio or fiber
Areas with late IP/MPLS
distribution rollout
80x
nodes
Base Station
Ethernet
CWDM
Existing structure developed for telephone
Moving from narrowband to broadband
Moving from static allocation to flexibility
Moving from complexity to simplicity
DSL will remain the dominating broadband technology in terms of volume.
Wireless broadband will be used as complementary technology.
Fiber to business locations will be deployed in established and new areas. FTTP will mainly be used in new build areas.
Ethernet will be the dominating technology for connecting the access network to the distribution network,
DSL
Distribution
FTTP
Fiber
New build areas
VDSL2
ADSL
ADSL2+
SHDSL
High capacity DSL areas
Core router
Distribution router
DSLAM or Ethernet switch
ngSDH node
Access

23. Ethernet over SDH: Options
Ethernet traffic (services) over pure SDH infrastructure
ngSDH, MSPP (Multi-Service Provisioning Platform)
“Old generation” SDH with external Ethernet-over-SDH capabilities
GFP, Virtual concatenation for “fat pipes”, LCAS, etc.
Ethernet traffic over combined SDH & PSN infrastructures
How to bridge two worlds in a most efficient way?
Egate
Channelized
STM-1
SDH
Metro
Ethernet
IP/MPLS
GbE

24. Summary
Variety of “All-IP” networks implementation: “One size does not fit all”
Increasing importance of intelligent multiservice access over diverse media
More technological alternatives are under way… driven by economics

25. Thank you for
your attention
Yuri Gittik