Istituto di Scienza e Tecnologie dell'Informazione     
Bondavalli A., Strigini L. Dsdr : a fair and efficient access protocol for ring-topology mans. In: INFOCOM'91 (Miami, 1991). Proceedings, pp. 1022 - 1030. IEEE, 1991.
In this paper a new MAC prolocol for Ring-topology Metropolitan Area Network is defined. The DSDR (Destination-Stripping Dual Ring) is defined for slotted medium, dual ring Networks. The main feature is the destination stripping capability, which yields a very high throughput through immediate reuse of the slots. The protocol parameters can be tailored for different compromises between guaranteed throughput and total throughput. On each of the two rings, guaranteed throughput, with bounded access delay, can be close to twice the medium capacity, and total throughput, under realistic hypotheses, can be close 10 four times the medium capacity. The maximum interval between accesses by the same station can be as low as N/2 slot times, with N stations on the network. Multicast can be supported with the same simplicity and the same cost as in other LANs and MANs. In general, destination stripping creates problems of unfairness. DSDR solves this problem by using a token mechanism. Fair sharing of the medium bandwidth among the stations together with high throughput is thus obtained.

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