ATM Adaptation Layer Issues

The impact of the Convergence Suldayer Protocol Data Unit (CS-PDU) size on the end-to-end network delay in a B-ISDN environment is investigated in this paper. Cell loss probabilities are assumed to be bursty and when a cell loss occurs a retransmission on the CS-PDU level will be done. The network has been simulated and the simulation results indicate that it is possible to select a CS-PDU size that will minimize the end-to-end delay. A typical ATM network has also been analyzed by using mathematical modeling technique. Assuming Poisson arrival process, it is possible to compute approximately the end-to-end delay as a function of the CS-PDU size. It can then be shown that the delay is optimized for a particular CS-PDU size.