Analysis of two level shaping for multiplexing of ON-OFF ATM sources

The analysis of the multiplexing of shaped ON-OFF sources in an asynchronous transfer mode (ATM) environment is discussed. A two-level shaper, modulating the source output bit rate on the basis of the buffer occupancy level, is studied. A very accurate analytical model describing its behavior is provided. Such a model allows an accurate description of the shaper output flow. To evaluate the advantages coming from the shaper introduction, an approximate analytical model of an ATM multiplexer, based on the fluid model, is proposed. The accuracy of the analytical results is investigated by means of a simulation approach. Numerical results show the effectiveness of the proposed shaping mechanism in terms of the number of multiplexed sources. The criteria for the choice of the shaper parameters are established and discussed