Effect of Frame Loss on the Holding Time of a Virtual Circuit in ATM LAN Interconnection

Mohammed Atiquzzaman
Department Electrical and Computer Systems Engineering, Monash University Clayton Campus, Clayton 3168, Australia.

Mahbub Hassan
School of Computing and Information Technology, Monash University Gippsland Campus, Churchill 3842, Australia.


We analyse the cost performance of LAN interconnection over ATM using switched VC. Frame loss due to buffer overflow during connection setup has been taken into consideration in the proposed cost function. We investigate the effect 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 buffer sizes is bounded by a minimum and a maximum value. Within the practical range, larger buffer reduces total cost. Increasing buffer beyond the maximum size does not have any impact on the total cost. For buffers below the minimum size, a connection should never be closed; such buffer sizes have, therefore, no benefit at all.

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