On the behavior of Hubnet with applications to priority implementation

A simulation model is developed from which the effect of the retry time on the performance of Hubnet is studied. Results show that increasing the retry time does not always mean higher delay. It is shown that, for retry time values that are less than and are factors of the packet lengths, the mean delay is better than some lower retry time values subject to some range. Also, it is shown that, contrary to what was believed earlier, a packet in a Hubnet with a retry time which is a factor of the packet length is guaranteed transmission rights. These results are used to study a Hubnet with two priority classes, where the retry times are used for priority assignment. It is shown that a lower retry time does not always mean higher priority. It is shown that a class of users with a retry time value that is a factor of the packet length could have higher priority than a class of users with a lower nonfactor retry time value