[e2e] ethernet jitter

Jonathan M. Smith jms at central.cis.upenn.edu
Sun Aug 20 13:54:56 PDT 2006

The definitive reference is "A Distributed Experimental Communications
System", by DeTreville and Sincoskie, IEEE JSAC, Dec. 1983.


Jonathan M. Smith
Olga and Alberico Pompa Professor of Engineering and Applied Science
Professor of Computer and Information Science, University of Pennsylvania
Levine Hall, 3330 Walnut Street, Philadelphia, PA 19104

On Sun, 20 Aug 2006, [iso-8859-1] "Alexander Carôt" wrote:

> Hello to all,
> after a period of silence from my side I have a question coming up.
> I could tell you the whole story which would be pretty long so for now I just give you the conclusion :
> I observed that in ethernet networks, that jitter starts even when 30% of the bandwidth capacity is used and increases with the used bandwidth. At 30% it appears every 2-3 seconds with a variation of 1-2 ms which goes up to 15-25ms constantly at 90% used bandwidth. In all the cases there was enough bandwidth for my existing UDP-audio stream which I also measured the jitter with. The additional traffic was either TCP-traffic or additional UDP-traffic - all the same behavior.
> In order to have the same preconditions I used a 10MBit/s line between two buildings on campus as the reference. Interesing is that the same behavior was observed with just two machines connected with a crossed cable and network cards configured with 10MBit/s.
> Configured with 100MBit/s it was the same behavior but of course it required 10 times more traffic to reach the 30% load.
> Can anyone confirm these measurements or do you know papers concerning this subject ?
> I'd appreciate any hint from you.
> Thanks a lot in advance,
> regards
> -- A l e x
> --
> Dipl.-Ing. Alexander Carôt
> Email : Alexander at Carot.de
> Tel.: +49 (0)177 5719797
> phd-candidate at www.isnm.de
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