Connection-oriented vs. connectionless communications
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(2) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Contents • Keys for the implementation of data networks • Elements of a vision – Network architecture – Access to Internet – Critical issues. • Conclusions.
(3) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. IP versus ATM • “In fact, the designers of IPv6 could easily explain why they believe that ATM is a serious mistake.” – C. Huitema, “IPv6: the new Internet Protocol”, Prentice Hall, 1996.. • “The decision to migrate to ATM for the high-speed, low-delay links of the Internet may be forced by the advantages of ATM over IP.” – J. Walrand and P. Varaiya, “Highperformance communication networks”, Morgan Kaufmann, 1996..
(4) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Keys for the implementation of data networks • Economies of scale • Economies of scope - service integration • Market and applications driven, not technology driven – IP for applications – ATM for LAN interconnection. Is IP the driving force for ATM?.
(5) < Previous Doc. < Previous View. Next Doc >. Next View >. Index Search. Table of Contents. Economics Benefit/Cost Benefit. Cost. Critical size. • Costs – – – –. Bandwidth Operation Administration Maintenance. • Benefit – Billing?. Users.
(6) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Elements of a vision • No single network technology will emerge as the undisputed winner. The reason is in part technological, in part economic. => Co-existence of technologies • Increase the number of functionalities on the platforms: – Service integration – Network interworking – Service interworking. • Shorten cycle time for provisioning and roll-out of new services.
(7) < Previous Doc. Next Doc >. < Previous View. Index Search. Next View >. Table of Contents. Architecture of data networks X25. Open/Closed IP FR. LL. ATM LL. IP. FR ATM LL FR = Frame Relay LL = Leased Lines.
(8) < Previous Doc. < Previous View. Next Doc >. Next View >. Index Search. Table of Contents. Long term data network • Migration towards a single backbone platform • Introduce many high speed nodes. IP. X25 FR. ATM LL. FR = Frame Relay LL = Leased Lines.
(9) < Previous Doc. Next Doc >. < Previous View. Index Search. Next View >. Table of Contents. Service interworking between technologies. X25. ? ? ISDN. FR. ATM.
(10) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Access to Internet. Telcos. PSTN ISDN. ADSL. Access Server Internet Service Providers. IP. Who will fill the gap?. Gateway. Carriers. Internet. ATM.
(11) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Critical issues • Challenges – – – –. Architecture Quality of service and reliability Mobility Security. • Open questions – Who controls the access to the network? – Which applications? – On-line performance monitoring – Monitor the usage. • Role of a TELCOng?.
(12) < Previous Doc. Next Doc >. < Previous View. Next View >. Index Search. Table of Contents. Conclusions • Trends – Migration towards a single backbone platform – Increase in service integration and service interworking. • Rationale – Cheaper transmission costs (e.g. less leased circuits) and bandwidth – Better network management in longer term – Faster introduction of new services.
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