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Apparatus for controlling internetwork communications

Patent 6321272 Issued on November 20, 2001. Estimated Expiration Date: Icon_subject September 10, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

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Inventor

Assignee

Application

No. 926837 filed on 09/10/1997

US Classes:

709/250, NETWORK-TO-COMPUTER INTERFACING709/223, COMPUTER NETWORK MANAGING709/224, Computer network monitoring709/232, Computer-to-computer data transfer regulating709/249MULTIPLE NETWORK INTERCONNECTING

Examiners

Primary: Geckil, Mehmet B.
Assistant: Thompson, Marc D.

Attorney, Agent or Firm

International Classes

G06F 015/16
G06F 015/173

Abstract

An interface allows for the transfer of real time control data with guaranteed delivery times between devices on a general purpose network and an industrial control system. A proxy server takes the role of a TCP/IP router and is configured to control the rate at which messages are forwarded from the non-real time to the real time portion of the network, keeping the loading of the real time portion stable regardless of the external non-real-time communication demand. Real time data is preconfigured and exchanged in a regular sequence, with the cyclic update period known. The length of any communication message necessary to transmit this information, plus any sequencing and acknowledgment overhead, is calculated in advance and aggregated. Each device with authority to transmit on the shared medium is given a time budget, calculated so that the total transmission quantity in unit time is deliberately limited to some fraction of the maximum transmission capability of the network. All communication from devices whose traffic loadings cannot be so controlled is arranged to pass through the proxy device in order to gain access to the deterministic network, and the proxy enforces the budget limits by introducing deliberate delays to the request messages if necessary.

Other References

  • Tak-Shing Yum et al.; "Dynamic Channel Assignment in Integrated-services Cable Networks", IEEE International Conference on Communications, 1991; ISBN 0-7803-0006-8; pp. 92-98, vol. 1, Jun. 1991.
  • Ng et al.; "Rate flow control for packetised voice on Ethernet local area network"; IEEE Singapore International Conference on Networks, 1993; ISBN 0-7803-1445-A; pp. 88-92, voo. 1, Sep. 1993.
  • Liu et al.; "A MAC protocol for real-time manumacturing traffic in client-server-based high speed broadcast networks"; IEEE IECON 22nd International Conference on Industrial Electronics, Control, and Instrumentation, 1996; ISBN 0-7803-2775-6; pp. 566-571, Aug. 199
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