Abstract
The FDDI Media Access Control (MAC) protocol incorporates a timed-token prioritization scheme. It is not clear from the standard, or from the limited amount of published work in this area, just what the scheme has to offer. This paper examines the performance available from the scheme and the forms of prioritization observed over a range of application cases. It is shown that the scheme offers throughput prioritization in all cases, but that in high-latency applications timer selection is a trade-off between efficient use of the network and high-priority delay. It is also shown that delay prioritization only occurs in relatively low-latency applications, and is enhanced in cases where network traffic consists of bursts of packets.
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