High-speed connectors may prove to be a significant source of crosstalk noise in 10 Gbps serial systems. Crosstalk increases jitter, and since crosstalk noise is not correlated with the link data pattern, it is hard to remove through equalization. This paper describes various crosstalk measurement techniques and provides a process to extract accurate coupled models from connectors. It also describes how measurement-based modeling can be used to predict crosstalk noise in a channel and shows how a small percentage of connector crosstalk can have a significant impact on the overall signal distortion if the connector pin assignment is not carefully planned out.