Results of a performance analysis are presented for several token ring protocols in a backbone environment; the fiber distributed data interface (FDDI) and the exhaustive service and the single-service broad site wideband networks for a reduced speed of 100 Mb/s. The operation of the protocols is studied in detail with respect to several performance parameters like percentage of token use or number of packets transmitted per token capture. For performance comparison, queue length as well as packet and file delay is considered. Every media access protocol under consideration is shown to work very well for typical numbers of stations (>

The authors study multiple-token rings for mixed traffic imposed by different applications and aiming at the attainment of high-speed local area networks (HSLANs). An approximate analysis based on the first two moments of interarrival time and token rotation time yields results extremely close to simulation results. The multiple-token ring appears to be an excellent candidate for the envisaged scenario. However, buffer dimensioning at the destination LAN, studied by simulation only, proves to be one of the most critical factors during the design phase of a HSLAN.>

A model of a multiple-token-ring backbone based on fiber-optic transmission, intended for LAN interconnection, is presented. Because it is one of the most important applications for inter-LAN communication, file transfer is selected for performance evaluation. A mixed traffic environment including interactive traffic is assumed. The suitability of multiple-token-access protocols is studied by approximate analysis and simulation, yielding results for both queue length and packet delay. Sensitivity with respect to medium length and station latency is considered. The results allow performance predictions for high-speed backbone networks.>