Abstract: Today, Internet is facing two challenges simultaneously: the need of a higher switching speed and provision of a QoS guarantee. The first requires that the buffers in switch must work at a line rate and the second requires that switch should mimic output queued switch. In this paper, a new buffered crossbar architecture with duplicated ports is presented. Theoretical analyzing demonstrate that the new fabric can not only mimic output queued switch without speedup, but also provide the low bound of crosspoint buffer. This shows that the proposed fabric is more appropriate for high performance switches.