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Measuring network performance parameters in data communication networks

  • US 6,831,890 B1
  • Filed: 10/31/2000
  • Issued: 12/14/2004
  • Est. Priority Date: 10/31/2000
  • Status: Expired due to Term
First Claim
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1. A method of non-intrusively measuring a performance parameter of a data communication network which delivers data items in order of transmission, comprising:

  • observing data items at a first location in the network;

    selecting data items whose contents match a first selection criterion;

    storing an indication of order of occurrence at said first location of each date item selected in accordance with said first selection criterion;

    observing data items at a second location in the network;

    selecting data items whose contents match a second selection criterion;

    storing an indication of order of occurrence at said second location of each data item selected in accordance with said second selection criterion;

    correlating sequences of data items occurring at said first and second location in terms of patterns of occurrence at said first and second locations and of said first and second selection criteria; and

    determining a network performance parameter from said correlated sequences, wherein the first and second selection criteria are varied dynamically according to the characteristics of data items traversing the network.

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