You can use the source inter / intra pair skew measurement for calculating the skew introduced by the cable. Run source inter-pair / intra-pair skew at TP1. Connect the cable. Connect the test fixture at the other end of the cable. Run the source inter/ intra pair skew measurement. Calculate the difference between these two skews (TP1 and TP2), this skew is introduced by the cable. Compare this value with the cable inter-pair / intra-pair skew limits specified in the CTS.