1. ATM NETWORK SIMULATOR Mavoungou B. MOUNANGA Network Planning

2. PLAN  Introduction  About the company and its ATM network  ATM’s concepts  Service classes  Traffic parameters  Routing  Network simulator  Specifications  Realization  Results  Conclusion

3. About the company EQUANT, telecommunications operator for companies LAN Access X.25 Frame Relay ATM BACKBONE LAN ATM ACCESS IP Services GVS DTN 1949: SITA’s birth (Société Internationale de Télécommunications Aéronautiques) 1991: EQUANT’s creation by SITA 2000: agreement between FRANCE TELECOM and EQUANT for creating a new company, which name remains EQUANT

4. The MTN (Mega Transport Network)  Backbone level : pure ATM  Access level : ATM + Frame Relay

5. ATM concepts  Multi-service environment (voice, data, video)  Basic transmission unity: the cell (53 bytes)  High speeds (>34 Mbps)  Connection oriented technology  CBR: Constant Bit Rate. E.g: voice, video  Rt-VBR: Real time Variable Bit Rate. E.g: compressed video  Nrt-VBR: Non real time Variable Bit Rate. E.g: data  UBR: Unspecified Bit Rate; a service in use for non critical applications. E.g: e-mail Service classes

6. ATM concepts  PCR:Peak Cell Rate; traffic source is emetting cells with a speed <= PCR  SCR: Sustainable Cell Rate; network’s guaranteed speed for user  MBS: Maximum Burst Size; maximum of cells arriving at PCR  ECR: Effective Cell Rate; bandwidth required for a connection or PVC (Permanent Virtual Circuit) Example of Nrt-VBR Traffic parameters

7. PNNI (Private Node to Node Interface), dynamic routing  Metric: Administrative Weight (AW)  Attribute: Available Cell Rate (AvCR)  GCAC algorithm (Generic Connection Admission Control)  CAC algorithm

8. PNNI, example of road calculation Source PP4PP5 ECR>AvCR

9. Present EQUANT network 2 routing types: PNNI + IISP PNNI cloud limited to 255 nodes => necessity to implement hierarchical PNNI by the beginning of 2002

10. Hierarchical PNNI concept Interest: smaller PNNI clouds Within a peer group (PG), a node knows how to join an external peer group but does not know the topology of this external peer group

11. The simulator: specifications  Simulate PNNI routing  Simulate IISP routing  Simulate hierarchical PNNI routing  Simulate network’s behaviour in case of equipement failure Development tool – Delphi, based on object technology (Pascal Object language) – Easy build of graphical interfaces

12. The simulator Equant network modelization: Input data for simulator: contained in Access tables 3 basic objects

13. The simulator  PNNI routing optimal path choice (minimum cost), with Dijkstra algorithm (GCAC) coded with Delphi equipment’s failure management (Dijkstra algorithm modification) optimization of calculation time for simulator Bandwidth booking management (CAC) for PVC establishment  IISP routing  Hierarchical PNNI routing, extension of PNNI with peer group notion

14. NetRoute, user interface

15. NetRoute, PNNI routing Europe cloud + equipment‘s failure

16. NetRoute, IISP routing Between Asia and Americas

17. NetRoute, PVC’s establishment  ATM PVC contained in an Access table  Calculation for optimal path then capacity’s booking  Saturated optimal path => PVC non established saved in a file  Final results saved in an Access table

18. NetRoute, hierarchical PNNI PVC between Amsterdam (Eams2) and Johannesburg (Cjnb2) in flat PNNI then hierarchical PNNI

19. NetRoute, hierarchical PNNI Explanation for <> paths between Amsterdam and Johannesburg

20. Conclusion  Data processing : object oriented development  Telecommunications: networks knowledge Technical Personal Business telecommunications Project management