S-Parameters Test Method - SFP+ Active Cable Specifications and Alternate Test Methods
SFF Committee
SFF-8461 Specifications for SFP+ Active Cable Specifications and Alternate Test Methods —— Chapter 3 S-Parameters Test Method for 10G SFP+Cu
Chapter 3S-Parameters Test Method for 10GSFP+Cu
3.1S-Parameters Test Method Procedure..................................................................7
3.1.1MCB-HCB S-Parameters Measurement...........................................................8
3.1.2Cable S-parameters Through Measurement..................................................8
3.1.3Cable S-parameters Crosstalk Measurement................................................9
Appendix A Matlab Code for S-Parameters Method ..............................................11
3.1 S-PARAMETERS TEST METHOD PROCEDURE
In order to calculate the cable parameters as defined in SFF-8431 table 37, following test procedure is required:
•Measure S-parameters for MCB-HCB from point B” to B, see 3.1.1
•Measure the s4p for through S-parameters for cable end 1 to cable end 2, see 3.1.2
•Measure the s4p for crosstalk S-parameters for cable end under test, see 3.1.3
S-Parameter Test Method Matlab code, Appendix A, reads the three S-parameters s4p files in order to calculate the cable parameters dWDP, VMA loss, and VCR.
3.1.1 MCB-HCB S-PARAMETERS MEASUREMENT
The 4-ports S-parameters for the MCB-HCB response from B” to B is measured with a Vector Network Analyzer, see Figure 3. The MCB-HCB 4-ports S-parame ters are used for S-Parameter Test Method Matlab code calibration, see Appendix A.
3.1.2 CABLE S-PARAMETERS THROUGH MEASUREMENT
Cable S-Parameters through Measurement setup is shown in Figure 4. The through measurement setup shown is for cable end B to cable end A with the response measured B’ to C’. The procedure is then repeated to measure cable through response from end A to end B.
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