Authors: Falko Bause, Pieter S. Kritzinger, Michael Sczittnick
Abstract:
The Distributed Queue Dual Bus (DQDB) protocol is
currently under study as the proposed standard for Metropolitan
Area Networks (MAN). This paper describes the steady state
performance analysis of a DQDB network by means of Markovian
modelling. In the analysis each station is considered
independently, but not in isolation, thus avoiding the
computational complexity which would otherwise be introduced by a
large number of stations. Thus the restriction to trivially small
networks frequently found in other analytical models does not
apply in our case. The model takes into account the relative
position of a station on the network, the phase difference between
the two buses as well as the relative availability of QA-slots.
Comparisons with our own simulation studies show that the
analytical results lie well within the 90 percent confidence
interval. The effect of various model parameters on network
performance are also studied.
Published in:
South African Computer Journal (SACJ), Vol. 11, 1994.