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Distributed monitoring of packet transmission delay

  • US 4,551,833 A
  • Filed: 08/10/1983
  • Issued: 11/05/1985
  • Est. Priority Date: 08/10/1983
  • Status: Expired due to Term
First Claim
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1. A transmission delay monitoring arrangement for measuring transmission delay of a predetermined number of packets during communication of the latter from a first circuit interfacing a communication channel with a packet switching network through said network to a second circuit interfacing another communication channel to said network, the invention comprising:

  • said first circuit comprises means for ascertaining arrival times of each of said predetermined number of packets; and

    means for inserting the individual ascertained arrival times into each of said predetermined number of packets;

    said second circuit comprises means responsive to a receipt of each of said predetermined number of packets and to said ascertained arrival times and the present time for calculating present sum delay signals representing an amount of time consumed in communicating said predetermined number of packets;

    means for defining transmission delay thresholds; and

    means responsive to said transmission delay thresholds from said defining means, said present sum delay signals from said calculating means, and a receipt of reference sum signals for indicating transmission delay excursions beyond said thresholds by said present sum delay signals from said reference sum delay signals.

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