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<span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">Ethernet 1000Mbps(without disturber) is done in our side.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">Ethernet 1000Mbps (with disturber) is going on.&#160; There is some trial and problem.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">1)) basic test (with disturber option) : fail occur in the (Peak point) item randomly.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">2)) After GND method is applied, test (with disturber option): fail occurs in the (Peak point) item randomly.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">GND method is like attached figure.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">When I ask (ethernet IP vendor),&#160; GND method is recommended and&#160; They said, it is strange that fail occurs in the (Peak point) item randomly.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">Q1) When (disturber option),&#160; it is nomal symptom that fail occurs in the (Peak point) item randomly.</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">Q2)&#160; Our GND method is right ?</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">Q3) What is the further debug/control point in the equipment(oscilloscope) ?</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">attachment:</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">20230503_151850.jpg&#160; // equipment setup figure</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">20230425_1000base_with_disturb.zip&#160;&#160; // 1000Mbps test with disturber</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">20230503_Disturber_NN06.zip&#160;&#160; // 1000Mbps test with disturber</span></span></span><br> <br> <br> <br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;">(ethernet IP vendor’s response)</span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">“The test results are different for the same DUT in every re-test. &#160;It is quite different from our test experience.</span></span></span></span></span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">In our environment (testchip/EVB/teat feature/Keysight), most chips pass the test. And most important of all, the results are “stable”.</span></span></span></span></span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">The same DUT keep the same result (No matter pass or fail) if we repeat the test. </span></span></span></span></span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">We are not sure why your customer’s results differ every time. We suggest your customer to check the test environment first</span></span></span></span></span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">Is chip GND clean? Can you shut down possible noisy buffer/IO that may possibly contribute to the GND noise?</span></span></span></span></span></span></span><br> <span style="font-size:11pt;"><span style="line-height:107%;"><span style="font-family:Calibri,sans-serif;"><span lang=EN-US style="font-size:9.0pt;"><span style="line-height:107%;"><span style="font-family:&quot;Verdana&quot;,sans-serif;"><span style="color:black;">Is EVB GND well connected to Tek? Is Tek Calibrated before the test? Is the active probe calibrated before the test?”</span></span></span></span></span></span></span><br> &#160;