1. Optical World D1 - 25/04/01 Present document contains informations proprietary to France Telecom. Accepting this document means for its recipient he or she recognizes the confidential nature of its content and his or her engagement not to reproduce it, not to transmit it to a third party, not to reveal its content and not to use it for commercial purposes without previous FTR&D written consent. Network architecture tools to support network operator requirements Luc Le BellerFTR&D/DAC

2. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D2 - 25/04/01 Outline è Introduction and scope è Generic transport layer structure è Two examples of IP over optical network configurations è Additional architectural components è Service description è Conclusion

3. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D3 - 25/04/01 Technical background Transport network architecture is driven by the following items : An important diversity of transport network techniques in the core and the access : SDH, ATM, IP, MPLS, OTN, GbE The development of control(s) plane(s) in addition to management(s) plane(s) : from B-ISDN to ASON A lot of different architectural models coming from the standardisation : ITU-T, IETF, OIF

4. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D4 - 25/04/01 Operator background Transport network architecture is driven by the following items : Diversification from raw transport service Provisioning/reconfiguration time enables differentiation from competition Transport carriers must differentiate their services and climb on the value chain Bandwidth on demand (wavelengths, SDH VCs) : OSP (optical service provider) i.e. Storm Modulation of quality of service (protection levels) VPN Dynamicity Transport costs decreased Monopoly era with reliable voice and LL services demand forecasts is over Emergence of multiple new services with uncertain needs Impact of competitors market share and network architecture options

5. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D5 - 25/04/01 Scope Full description of the transport network components General interaction between transport network components Interaction between transport network components and other networks and services components Consistent top-down (from the service to the network) and bottom-up (from the network to the service) description G.805 and derived standards, G.8080 and derived standards : very low granularity Depending on organisation structure (actors, business units) Also depending on organisation structure with more actors and business units SG 15 bottom-up approach ; SG 13 top-down approach

6. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D6 - 25/04/01 Outline è Introduction and scope è Generic transport layer structure è Two examples of IP over optical network configurations è Additional architectural components è Service description è Conclusion

7. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D7 - 25/04/01 Generic Layer Structure A generic layer structure for transport network, independent of the techniques, is obtained by combination of the following criteria : - Does the layer provide flexible connectivity (G.805 sub-network capability) or not ? - What type of resources in the layer needs to be reserved in response to a client request for the transport of his (characteristic) information ? FW SW/XC PHY Layer(s) offering point-to-point connectivity is named PHY layer Layer(s) offering flexible connectivity and requiring specific resources allocation for Every sub-network is named SW/XC Layer(s) offering flexible connectivity and not requiring specific resources allocation for every sub-network is named FW

8. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D8 - 25/04/01 Transport Network Techniques FW SW/XC PHY MPLS, ATM VP/VC, SDH VC-X, ETH MAC, OTN ODUk/OCh IP SDH RS/MS, OTN OTS/OMS ETH PHY, Optical Fiber Not only physical !! It is assumed that a G.805 client/server relationship is existing between all these layers

9. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D9 - 25/04/01 One example IP SW/XC STM-N/WDMPHY FW ATM VP/VC SDH VC-4/VC-4-4c IP ATM VP VC-4-4c STM-4 a b c d e Equivalent G.805 representation of a, e, k and c client/server relationships aa ee kk cc ee kk k VC-4-4c

10. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D10 - 25/04/01 Outline è Introduction and scope è Generic transport layer structure è Two examples of IP over optical network configurations è Additional architectural components è Service description è Conclusion

11. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D11 - 25/04/01 IP over optical configurations O2 O1 Optical Network O3 I6 I4 R6 R5 R4 IP Network I5 Can both IP adjacencies R4-R6 and R4-R5 coexist on the same I4 interface ?

12. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D12 - 25/04/01 Concatenated versus channelised IP FW OTN IP OF OTN CHANNELISED : more than one adjacency per interface IP SW/XC STM-16/OF PHY FW OTN IP OF PHY CONCATENATED : only one adjacency per interface SW/XC The SW/CX layer is supporting the PHY layer ! PHY

13. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D13 - 25/04/01 Outline è Introduction and scope è Generic transport layer structure è Two examples of IP over optical network configurations è Additional architectural components è Service description è Conclusion

14. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D14 - 25/04/01 General processes For the description of the services telecommunication, it is useful to structure all the actions required to offer a service in the following (and chronologically) way : - pre-sales (PSA) -subscription (SCR) - invocation (INV) - assurance (ASU) - billing (BIL) This structure can also be applied to the transport network and as example to the IP over optical configurations where the service is : creation of an IP adjacency between routeur R4 and R5 O2 O1 Optical Network O3 R6 R5 R4 IP Network I4 I6 I5

15. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D15 - 25/04/01 Operations for conc. and chan. (1) CHANNELISED CONCATENATED PSASCRINV -Routers localisation -Routers deployment -Interfaces I4 and I5 installation -Create optical channel PSASCRINV -Routers localisation -Routers deployment -Create optical channel(s) 1 2 3 1 2 34 Step 4 requires a step 3 : the same dynamics applies Step 4 can be independent of step 3 : different dynamics can apply Operations 1 to 4 are required to create an adjacency between routers R4 and R5 -Interfaces I4 and I5 installation 4

16. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D16 - 25/04/01 Operations for conc. and chan. (2) Optimized procedure for the CONCATENATED configuration PSASCRINV -Routers localisation -Routers deployment -Create opticals channels 1 2 4 This requires the provisioning of routers with the maximum capacity of interfaces 3 -Interfaces Ix installation Optimized procedure for the CHANNELISED configuration PSASCRINV -Routers localisation -Routers deployment -Create opticals channels 1 2 34 This requires installation of interfaces at the highest capacity -Interfaces I4 and I5 installation at maximum bit-rate ! : optimisation is considered from the IP network side

17. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D17 - 25/04/01 Transport service definition at G.805 level 1) Trail service 2) Sub-network connection service Note : trail service requires at least one sub-network connection service (except if X is a PHY layer) A and B : access groups or sub-networks Telecommunication service modelling requires other considerations : additional transport layers, division in actors (partitioning), control plane components, …

18. France Telecom R&D Diffusion of this document is subject to France Telecom authorization Optical World D18 - 25/04/01 Conclusion It has been shown on a basic IP over optical configuration that a technical choice has great impact on the global architecture. This was made possible by a network modelisation at a low-level of granularity, which assembles well defined elementary architectural components. Elementary architectural components must continue to be standardised independently of the technology There is no need to standardize more global architectural tools