E ect of Frame Loss on the Holding Time of a VirtualCircuit in ATM

We analyse the cost performance of LAN interconnection over ATM using switched VC. Frame loss due to buuer overrow during connection setup has been taken into consideration in the proposed cost function. We investigate the eeect of the length of the holding time of an idle VC on the total cost per frame transmitted. Our simulation results suggest that there is no optimum holding time for minimising the total cost. Increasing the holding time either increases or decreases the total cost depending on the cost associated with a connection setup and frame loss. We also show that for a given cost associated with a frame loss the practical range of buuer sizes is bounded by a minimum and a maximum value. Within the practical range, larger buuer reduces total cost. Increasing buuer beyond the maximum size does not have any impact on the total cost. For buuers below the minimum size, a connection should never be closed; such buuer sizes have, therefore, no beneet at all.