1. - D1 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) NGN an architecture for 21st century networks? ITU-T NGN Workshop (Geneva, 9-10 July 2003) Keynote session Patrice Collet (France Telecom, Director, Network Strategy and Architecture)

2. - D2 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) FT global network evolution context  A very competitive environment Keeping network costs as low as possible Faster return on investment is needed A strong pressure to tariff decrease  PSTN traffic slowly growing Shared now between several competitors  A steady data traffic demand growth resulting from Internet traffic demand Started with dial up access Increased with broadband access offers

3. - D3 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Major network evolution trends (1)  A large ADSL deployment :  End 2002 : 2000 mdf (out of 12 000) equipped with DSL serving 21 millions lines 1.4 million users connected  A rapid growth: more than 2 millions users end June 2003  Packet backbones deployment  Expansion of ATM network to collect traffic from DSLAMs More than 400 ATM cross connects (starting from 80 in 1998)  An IP backbone deployed serving around 60 PoP in 30 towns  With ADSL a new type of mass market access network is being built  To meet an actual and ready to pay demand: the second time in telecom history after telephone service

4. - D4 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Major network evolution trends (2)  Stable telephone network  Reduced number of core switches from ≈ 900 to less than 600 end 2002  Decrease of the number of transit exchanges To face evolution of interconnection traffic scheme And reduce network costs (energy, m², taxes…)  A limited number of new facilities to be implemented (in general IN based) Reduction of software releases to be deployed  A good quality of service  No short term obsolescence of switching equipments But a part of local exchanges are now roughly 20 years old –Renewal imagined starting in the second part of the decade  Which technology for the future telephone service? TDM network renewal strategy

5. - D5 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Access network perspective  Through its increasing bandwidth, xDSL gives the potential of new services  New multimedia services integrating voice, data & video could be provided,  These services are now appearing on the Internet (videophony & videoconference, streaming of video clips, Web TV, …), but with uncontrolled QoS  xDSL opens the door to residential and SME voice services migration to packet networks  xDSL deployment shapes the future access network architecture  ADSL, ADSL2+, SDSL, VDSL interfaces provided by the same DSLAM  End user fiber connection to DSLAM with ATM traffic concentration  Integration of video functions Digital TV program broadcasting and channel zapping  In some DSLAM implementations POTS connection are or will be provided  DSLAMs as the future “universal” customer connecting unit?

6. - D6 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) NGN as the 21st century network architecture?  What provides NGN concept ?  A unified packet transport layer for all types of services  A session based control architecture For person to person voice or video services over a packet infrastructure  FT expectations from NGN  Be the support of new multimedia services combining voice data and video To generate new revenue streams  In addition be the future infrastructure of telephony services Shared with multimedia services To face the need for renewing PSTN infrastructure (when obsolete) While securing voice revenue stream  Be able to combine Internet services and more traditional communication services  Interest for NGN focussed on access systems

7. - D7 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Some requirements for NGN implementation  Need for interoperability between equipment providers  Commonly agreed functional and organic architectures needed  A set of standardized interfaces and protocols to be agreed upon  Ability to serve several kinds of access network  Fixed copper, fiber, wireless..  Mobile  An open services architecture  Standard interfaces open to third party service providers  Allowing for Interaction between Internet access services and other multimedia services Probably more a question of role of actors than a technical issue  An architecture based on UMTS (Release 5/6) architecture principles  Including some mobility features at the fixed access: user nomadism  Providing minimum service continuity between fixed and mobile access through VHE

8. - D8 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Some requirements for NGN implementation (2)  Need for QoS differentiation  Services like voice, video, need QoS control mechanisms  Especially at the access level Limited bitrate access shared between several services –upstream ADSL channel for example Need for bandwidth allocation mechanisms  A set of management functions shared between different services  Self-provisioning, usage metering for billing, QoS monitoring, statistics..  A common technology for transport layer  IP and MPLS seem the good candidate for such a layer Large world industrial support and good evolution speed ATM for bandwidth sharing on copper to provide QoS to voice and video services  Significant efforts of standardisation/ selection of relevant standards work still to be done

9. - D9 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Architecture : standardization needs NB Wireless BB Wireless BB Wireline Service X Service Y Unified transport : Open interfaces Separated control Management OSA/WebServices ? IP/ATM/MPLS ? Bandwidth sharing ? QoS mechanism ? H323/SIP ? FMC ? MGCP/H248 ? Usage measurement ? ENUM ?

10. - D10 - FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003) Conclusion  There is an opportunity window for NGN architecture implementation  Obsolescence of TDM systems started to be deployed in the early 80s  Two key questions:  True multimedia capability of this architecture  QoS benefits provided by NGN compared with ISP-like architecture  Some challenges:  Keep an integrated architecture open enough To make it capable to quickly and easily evolve  Achieve the necessary industry consensus To meet the interoperability requirements