Skip to main content
SpringerLink
Log in

Real-time fault tolerant operation of the 802.5 token ring

  • Published:
Real-Time Systems Aims and scope Submit manuscript

Abstract

Scheduling a hard real time application on a token ring requires that the delays to capture the token be known. Previous studies considered only a small subset of the token ring mechanisms in schedulability analyses. In this paper, we study the influence of three types of faults on the time to capture the token. These are token losses, failures of the active monitor and cable faults. We also show the influence of the stack mechanism on the delay to capture the token. The paper ends with an evaluation of these delays in various ring configurations in which the transmission speed, token hold time and ring latency are variables. We conclude that the token ring may be very difficult to schedule for hard real time applications because we do not know if other mechanisms or combinations of phenomena can introduce additional delays that make the operation of the ring unpredictable in the present state of knowledge.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Agrawal, G. et al. 1992. Guaranteeing Synchronous Message Deadlines in High Speed Token Ring Networks with Timed Token Protocol.Proc. of 12th IEEE Conf. on Distributed Systems, Yokohama, Japan, pp. 468–475.

  • Benel, R.A., Dancey, R.D., Dehn, J.D., Gutman, J.C. and Smith, D.M. 1989. Advanced Automation System Design.Proceedings of the IEEE, 77(11):1653–1660.

    Google Scholar 

  • IEEE 1989. IEEE Standard 802.5-1989, Token Ring Access Method, IEEE, 1989.

  • Kopetz, H.et al.. 1989. Distributed Fault Tolerant Real-Time Systems: The MARS Approach.IEEE Micro, 9(1):25–40.

    Google Scholar 

  • Le Lann, G. 1990. Critical Issues for the Development of Distributed Real-Time Computing Systems.Proc. of Second IEEE Workshop on Future Trends of Distributed Computing Systems. Cairo, Egypt, pp. 96–105.

  • Le Lann, G. 1992. Designing real-time dependable distributed systems.Computer Communications, 15(4): 225–234.

    Google Scholar 

  • Pleinevaux, P. 1992. An Improved Hard Real-Time Scheduling for the IEEE 802.5.Journal of Real-Time Systems, 4(2): 99–112.

    Google Scholar 

  • Rufino, T. and P. Verissimo, P. 1992. A Study of the Inaccessibility Characteristics of ISO 8802/4 Token Bus LANs.Proc. of IEEE INFOCOM'92. Florence, Italy.

  • Sha, L. and Sathaye, S. 1993. A Systematic Apporach to Designing Distributed Real-Time Systems.IEEE Computer, Sept. 1993, pp. 68–78.

  • Strosnider, J., Marchok, T. and Lehoczky, J. 1988. Advanced Real-Time Scheduling using the IEEE 802.5 Token Ring.Proc. of IEEE Real-Time Systems Symposium, Huntsville, Alabama, pp. 42–52.

  • Strosnider, J., Marchok, T. 1989. Responsive, Deterministic IEEE 802.5 Token Ring Scheduling.Journal of Real-Time Systems, 1(1): 133–158.

    Google Scholar 

  • Yao, L. and Zhao, W. 1991. Performance of an Extended IEEE 802.5 Protocol in Hard Real-Time Systems.Proc. of IEEE Infocom'91, pp 469–478.

Download references

Author information

Authors and Affiliations

  1. Computer Engineering Dept., Swiss Federal Institute of Technology, 1015, Lausanne, CH

    P. Pleinevaux

Authors
  1. P. Pleinevaux
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Pleinevaux, P. Real-time fault tolerant operation of the 802.5 token ring. Real-Time Syst 8, 79–91 (1995). https://doi.org/10.1007/BF01893146

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01893146

Keywords

Search

Navigation