Effect of resource sharing and VP bandwidth control schemes on the capacity related reliability of ATM transport networks

Since high availability requirements are expected to increase in the B-ISDN era, adequate methods are needed, which allow network designers and operators to outline the relation between available network resources and actual traffic demands on one hand and the reachable availability (performance index) for either the whole network or individual virtual path connections on the other hand. This paper suggests a simple and thus fast method for deriving the symbolic expression of the performance index in a compact form, from which a “capacity related reliability polynom” may easily be derived. Since the capacity of several subnetworks must be computed taking re-routing capability into account, an efficient procedure for capacity determination is also suggested. An example illustrates the procedure and particularly points out the effect of both resource sharing and VP bandwidth control schemes on the performance index