A crossbar ATM switch for multicast traffic

A crossbar ATM switch for multicast traffic is proposed. First, we propose a crossbar ATM switch to which is added a new state of a switch element cap able of performing cell replication at the routing crossbar, with a header translator placed in front of the concentrator following the routing crossb ar, as the proposed model 1. By adding minimal faculties to the conventiona l model, proposed model 1 can cope with multicast traffic without degrading the performance of the conventional model. However, due to treatment of mu lticast traffic in proposed model 1, output congestion is liable to occur. Furthermore, cells which do not complete cell replication and cell routing at the routing crossbar are sent to the concentrator. That is, the ratio of cells lost by concentration at the concentrator increases and the cell los s probability is degraded. Second, we propose a crossbar ATM switch where t he concentrator is removed and all the output lines of the header translato r are connected to a shared buffer, as the proposed model 2. We use compute r simulations to compare the performance of proposed model 2 with that of p roposed model 1 for mixed traffic with unicast and multicast cells with res pect to cell loss probability and mean delay. It is shown that proposed mod el 2 Can improve cell loss probability performance dramatically for low and medium loads. (C) 2001 Scripta Technica, Electron Comm Jpn Pt.