Throughput of ADSL modems

Haitze J. Broersma, N. Bruin, Johann L. Hurink, L.E. Meester, S.S. op de Beek, J. Westhuis, J.H. Westhuis

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This paper considers the throughput of ADSL (Asymmetric Digital Subscriber Line) modems, used for high-speed data transmission over relatively unreliable connections, e.g. copper telephone wires. The modem technique uses an error correcting code and interleaving. The settings include a grouping factor $S$ which affects the amount of data per code word, the number $R$ of redundant bytes per code word and the interleave depth $D$. The influence of these parameters on both the effective data transmission rate and the resulting error rate in the received signal are determined for two error situations: random errors and bursts of errors. An approximate analysis for the random error case of the throughput of a TCP (Transport Control Protocol) connection using an ADSL modem shows that maximum throughput is obtained for the highest values of $S$ and $R$.
Original languageUndefined
Place of PublicationEnschede
PublisherUniversity of Twente
Publication statusPublished - 1999

Publication series

PublisherDepartment of Applied Mathematics, University of Twente
ISSN (Print)0169-2690


  • MSC-94A40
  • MSC-94B20
  • EWI-3302
  • IR-65671
  • MSC-94B70

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