Keysight Technologies N4917CPCA User Manual

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Keysight Technologies N4917CPCA User Manual Manual pdf 53 page image

Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 53Using the N4917CPCA Software 4Parameter detailsFigure 17 shows the stressed eye calibration targets and tolerance.The Adjustment check box, if checked, adjusts the parameters shown inFigure 17 to meet the target values during the stressed eye calibration.(This is equivalent to a value of TRUE for these parameters in theparameter file). If an item is unchecked, it is measured but not optimized.You may uncheck all the items and still run the test to verify performance.It is not recommended to check some but uncheck others as these items,in general, are interdependent.Figure 17 Measurement ItemsFigure 18 and Figure 19 show the PJ2 and BUJ views of the parameters,respectively, that are adjusted by the N4917CPCA Test Solution softwarein order to meet the stressed eye calibration targets. Starting values,loaded from the parameter file, speed up the calibration. It is notrecommended to put 0 as a value in for any of these parameters becausedoing so limits the initial adjustment in only one direction and can lead tolong calibration times.NOTE For the 10GBASE standards, the selection is RJ or BUJ as there is no PJ2component in the stressed eye for 10GBASE standards.