| 摘要 |
<p>A traffic source requesting connection states about itself in accordance with the ATM specification the PCR (Peak Cell Rate), the SCR (Sustainable Cell Rate,) the BT (Burst Tolerance) and the desired probability of cell loss PLOSS. The CAC function uses these parameters for computing certain parameter ratios. These computed parameters or corresponding parameters closest to these are sought from a pre-formed table and the same table is studied to find out the equivalent capacity corresponding to the parameters. This capacity is named as the equivalent capacity of the source requesting connection and the source is allowed access and permission to send, if there is free link capacity. Otherwise the request is dismissed. The equivalent capacities of the table are defined by using large deviation approximation which is known as such and which has been developed for a bufferless queue and for homogenous traffic. Differing from the known method, the number of cells arriving at the same time is not observed but the distribution of the number of cells arriving during the time 2.T is observed. The time T depends on the buffer length B and on the capacity C of the output link and it is defined as T = B/C.</p> |
