EXTENDING THE SINGLE-NODE DQDB ANALYTICAL MODEL TO ANALYZE NETWORK-WIDE PERFORMANCE

The exact analytical model of DQDB is known to have state space explos ion problem which makes its analysis intractable. The approximate sing le-node analytical model, introduced in a paper by Bisdikian and exten ded in a paper by Jing and Paterakis, has been proven to be a tractabl e model capable of providing valuable insight into the DQDB network be havior. In this paper, we show how to further extend the single-node m odel to approximately evaluate the average message delay of individual nodes for an entire network. We discuss the difficulties involved in applying the single-node model network-wide and approaches to circumve nt these difficulties. We present some representative approximate mean message delay results. Finally, with the help of simulations, we stud y the effect of an analytical approximation-Bernoulli Slot Occupancy-o n the mean message delay over DQDB networks.