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Tech-report number: 216-92
Date:               October 1992
Title:              A reservation-based CSMA
                        protocol for integrated manufacturing networks
Authors:            Rajendra Yavatkar, Prashant Pai, Raphael Finkel
At:                 ftp.ms.uky.edu: pub/tech-reports/UK/cs/216-92.ps.Z
Abstract:
        This paper presents PCSMA, an extension to the CSMA/CD protocol (used
        in the Ethernet) to support both conventional datagram traffic  and
        real-time traffic.  The protocol provides predictable packet-delivery
        bounds for real-time traffic. It does not require changes to existing
        Ethernet controllers for datagram traffic.  Under the new protocol,
        periodic sources follow a variation of the CSMA protocol that requires
        them to reserve transmission slots before they can begin transmission.
        This protocol is intended particularly for use in the integrated
        network in a manufacturing shop.  Periodic sources include multiple
        sensors generating disparate types and rates of data.  We have carried
        out an extensive performance evaluation of the protocol using a 
        simulation model.  The results are impressive:  PCSMA shows fewer
        collisions than CSMA, equivalent delays for conventional traffic, and
        no failures to meet deadlines for periodic traffic.
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