Journal of Information & Systems Management Guannan Qu, Zhiyi Fang, Jianfei Zhang, Lin Chen, Haiqin Qu 4 1 2014 http://www.dline.info/jism/fulltext/v4n1/4.pdf We recently proposed an innovative agile crossbar switch architecture called Contention-Tolerant Crossbar Switch, denoted as CTC (N), where N is the number of input/output ports. CTC (N) can tolerate output contentions instead of resolving them by complex hardware, which makes CTC (N) simpler and more scalable than conventional crossbar switches. In this paper, we analyze the main factors that influence the performance of CTC (N) and present an improved contention tolerant switch architecture - Diagonalized Contention-Tolerant Crossbar Switch, denoted as DiaCTC (N). DiaCTC (N) maintains all good features of CTC (N), including fully distributed cell scheduling and low complexity. Simulation results show that, without additional cost, the performance of DiaCTC (N) is significantly better than CTC (N).