Keysight Technologies N4917CPCA User Manual

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Keysight Technologies N4917CPCA User Manual Manual pdf 24 page image

24 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide3 Concepts and Features of N4917CPCA SoftwareSoftware concept and flow of Optical Receiver TestThe N4917CPCA Optical Receiver Stress Test solution software includesthree main functions—Stressed Eye Calibration, Jitter Conformance Testand Jitter Performance Test.A Stressed Eye calibration is required first to provide an optical waveformwith jitter and interference impairments per the applicable standard. Thisstressed signal is then used in conjunction with a JitterConformance/Performance routine to test one channel at a time of theDUT.Figure 4 Stressed Eye Calibration and Measurement flowThe calibrated parameters in the stressed eye are Extinction Ratio, VECP,J2, and J9. The Stressed Eye Calibration adjusts the values of theseparameters until the respective values meet the limits defined in thespecification.The results and parameter settings from the Stressed Eye Calibration aresaved in a file. These parameters are automatically referred to whilerunning the Jitter Conformance Test and the Jitter Performance Test.Figure 5 Using the Stressed Eye Calibration Results as referenceStressed EyeMeasurementJitter ConformanceTestJitter PerformanceTestStressed EyeMeasurementJitter ConformanceTestJitter PerformanceTestResult fileReference