1 April 1994 Analysis of 100Base-VG demand priority protocol: effects on real-time communications
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Real-time applications require not only high bandwidths, low access delays, high reliability (low loss rates) but guarantees on the upper or lower bounds of all three. Guarantees, in addition to allowing real-time applications to be notified of their exact Quality of Service (QoS) actually improve the QoS that can be provided. The client's QoS varies based upon system and network load and may be adjusted based on the total offered load, the available bandwidth and delay characteristics of the network. These requirements for guarantees in delay and bandwidth have stimulated the need for new network architectures that consist of network protocols that provide the underlying support for guarantees in medium access delay and bandwidth. 100Base-VG is a data link layer 100 Mbps LAN protocol that uses a preemptive round robin scheme to provide system connectivity to a workgroup. In this paper, we analyze the performance of 100Base-VG using a simple analytical and simulation model. Expressions for network utilization, throughput and access delay are derived. From these, we show that 100Base-VG provides the basic characteristics required by a real-time network architecture at the data link layer to support guarantees for delay, delay jitter and throughput.
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Jayant Kadambi, Jayant Kadambi, Stephen Barilovits, Stephen Barilovits, "Analysis of 100Base-VG demand priority protocol: effects on real-time communications", Proc. SPIE 2188, High-Speed Networking and Multimedia Computing, (1 April 1994); doi: 10.1117/12.171707; https://doi.org/10.1117/12.171707

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