By Jorge Moreira de Souza, Nelson L.S. da Fonseca and Edmundo A. de Souza e Silva (Eds.)
This e-book offers contemporary advancements on teletraffic technology and engineering, particularly on site visitors modelling and regulate of the net (TCP/IP), instant and Multimedia Networks. in addition, it provides new queueing and optimisation equipment utilized to the making plans and regulate of the telecommunications networks.
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Additional resources for Teletraffic Engineering in the Internet Era, Proceedings of the International Teletraffic Congress - ITC-I7
Example text
The (relatively) large peaks noticed in the TCP plot may be thought to be created by some Web applications refreshing their pages on a periodical time basis. g. [ 1 0 - 25] or [30 - 60] s), and three for TCP traffic (around 10, 20 or 40 s). This qualitative analysis, added to numerous in-depth examinations of typical flow structures not reported here, led us to determine a reasonable TO value of 20 s for all streams. For the sake of simplicity, this will be the common value implicitly used in the subsequent work.
Defined by one transport protocol or by one application). We can hope that the obtained histograms exhibit distinct modes (or classes) which could be interpreted as representative of intra-flow packet i. a. t. or inter-flow intervals respectively. The ideal situation should be to get two modes with a clear separation between them, which would lead to an unambiguous choice for an acceptable TO value. This has been done, and results are reported in Figure 2, for all streams identified in the first 1000 s of the ADSL experiment for UDP and TCP streams, respectively.
ACKNOWLEDGEMENTS The authors thank the Network Division of France Telecom for allowing publication of these results about IP measurements. They are greatly indebted to J. Roberts for many fruitful discussions and to the France Telecom R&D teams, especially C. Jaffray, J. Franqois, R. Vinel, G. de Hauteclocque and R. Cicutto, who made the data available to them and performed the necessary pre-processing steps. REFERENCES 1. J. Apisdorf, K. Claffy, K. Thompson and R. Wilder, 'OC3Mon: Flexible, affordable, highperformance statistics collection', Proc.