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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Here is Brent’s comment regarding the proposed Rx Tolerance test.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Rothermel, Brent R [mailto:brent.r.rothermel@intel.com] <br><b>Sent:</b> Wednesday, March 13, 2013 8:37 AM<br><b>To:</b> Rupert Dance; Cole, Cliff<br><b>Cc:</b> bennera@us.ibm.com<br><b>Subject:</b> RE: MOIs for FDR devices RX tolerance testing - our proposals and questions<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Rupert,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I agree with some of their proposals in this email, not with others<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span style='color:#1F497D'>Agree<o:p></o:p></span></u></b></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>The DUT transmitter should be used to generate the counter-propagating aggressors. This DUT transmitter should have a ‘compliant’ edge rate, meaning no faster than 24ps but fast enough to meet the eye mask.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>A cable can be used as the stimulus *<b>if</b>* it has worst-case compliant signal coming out of it. This is unlikely to be the case, which is why we have used a pattern generator to create this signal in the past<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span style='color:#1F497D'>Disagree<o:p></o:p></span></u></b></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>We cannot go through both an MCB and an HCB to get into the system under test – this is too much loss.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>The ‘crosstalk generator’ in their diagram is only used for calibration of the victim signal, and should be removed when connected to the system under test (because the system under test is generating the counter-propagating crosstalk at that point.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>The co-propagating aggressors should be sourced from the signal generator and propagating through the cable into the system under test.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I look forward to discussing this with Mellanox on today’s EWG meeting.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'>Brent Rothermel<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Intel Corporation<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>(610) 312-2171 <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>8-322-2171<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="mailto:brent.r.rothermel@intel.com">brent.r.rothermel@intel.com</a> <o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Rupert Dance [<a href="mailto:rsdance@soft-forge.com">mailto:rsdance@soft-forge.com</a>] <br><b>Sent:</b> Monday, March 11, 2013 9:03 PM<br><b>To:</b> Rothermel, Brent R; Cole, Cliff<br><b>Cc:</b> <a href="mailto:bennera@us.ibm.com">bennera@us.ibm.com</a><br><b>Subject:</b> FW: MOIs for FDR devices RX tolerance testing - our proposals and questions<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Hi Guys,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>I am trying to spread the load of these questions around the group but we did not get time to review this proposal at the last EWG meeting. Mellanox is proposing a RX tolerance testing for use with limiting active cables and they have several questions and here is the summary of the question I would like you to consider:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=2 width="100%" noshade style='color:#7030A0' align=center></span></div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>The FDR specification requires the signals, transferred over the counter-propagating aggressor lines, to have a 700 mV amplitude with 24 ps transition time, as measured at TP6a (Figure 179 in the FDR specification). As it was mentioned, these signals are generated by the transmitters of the tested FDR port, and therefore should have a <u>minimal</u> transition time of 24 ps (per Table 49 of the FDR specification – FDR host output specifications at preset 0, for Limiting Active Cables). In this relation, we understand that the specified test value for the crosstalk calibration transition time of 24 ps is also a minimal value, otherwise it would be nearly impossible to satisfy the test requirements for both the driver and the receiver testing. Specifically, Mellanox transmitters provide signals with larger transition times. Please advise whether our understanding of the specification is correct and signals with 700 mV amplitude and a slower than 24 ps transition time, generated by the transmitters of the tested port satisfy the requirements for the counter-propagating aggressors.<o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><hr size=2 width="100%" noshade style='color:#7030A0' align=center></span></div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Rupert<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Alexander Rysin [<a href="mailto:arysin@mellanox.com">mailto:arysin@mellanox.com</a>] <br><b>Sent:</b> Tuesday, March 05, 2013 9:45 AM<br><b>To:</b> Rupert Dance<br><b>Cc:</b> Daniel Fradkin; Vitaly Roitberg; Aviv Berg<br><b>Subject:</b> MOIs for FDR devices RX tolerance testing - our proposals and questions<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>Hi Rupert,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>Please find attached our proposed MOI for FDR devices RX tolerance testing for use with linear cables for Tektronix BERTScope Bit Error Rate Tester, for your revision. We are looking forward to any comments regarding required changes in order to make it a useful document for the IBTA.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>I have also begun working on a similar document for FDR devices RX tolerance testing for use with <u>limiting active cables</u>. I have studied the FDR specification and the related parts of the IEEE 802.3 document, which propose the following test setup (Figure 179 in the FDR specification):<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><img border=0 width=448 height=330 id="Picture_x0020_2" src="cid:image002.png@01CE1FC0.8AD9E240"><o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>The goal of the setup is to provide a signal with a certain level of distortion to the tested receiver. The IEEE 802.3 document has quite specific requirements for the stressed signal. With that, it states that any approach that creates the appropriate stress is acceptable (page 392), hence using the exact setup is not mandatory. Given this statement, since we do not have the time to implement the exact setup before PF23, we have searched for an alternative setup. After some research we performed, we have found that the appropriate stress can be achieved by employing an actual active limiting cable (specifically, we have achieved it with a cable with P/N 018-1651-001). We feel that such approach to the test should be preferred, since it better emulates the real situation, when the receiver is connected to an active cable. Therefore, we propose the following setup for this test:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><img border=0 width=943 height=392 id="Picture_x0020_4" src="cid:image003.png@01CE1FC0.8AD9E240"><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>The limiting cable creates the required stress for the tested receiver. This is verified by connecting an oscilloscope to the right MCB and measuring the DDPWS, the J2 jitter and the J9 jitter. In addition, sinusoidal jitter with amplitude of 0.05 UI and frequency higher than 20 MHz should be applied to comply with the IEEE 802.3 requirements.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>In addition to the DDPWS and jitter requirements to the stressed signal, the FDR specification presents requirements for the crosstalk from near end (counter-propagating) and far end (co-propagating) aggressors. We propose to create this noise in the following manner: the signals for the co-propagating aggressors should be generated from an external signal generator, satisfying the requirements for these signals (450 mV amplitude with 17 ps 20%-80% transition time, e.g. generated by Anritsu MU181020B PPG) and the signals for the counter-propagating aggressors should naturally be generated from the transmitters of the tested FDR port.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>We would like to receive your comments regarding this approach in order to complete the MOI document for FDR RX tolerance testing for use with limiting cables and in order to employ it in the RX tolerance testing in the framework of PF23. In addition, we have a question regarding the requirements for the crosstalk from the counter-propagating aggressors. The FDR specification requires the signals, transferred over the counter-propagating aggressor lines, to have a 700 mV amplitude with 24 ps transition time, as measured at TP6a (Figure 179 in the FDR specification). As it was mentioned, these signals are generated by the transmitters of the tested FDR port, and therefore should have a <u>minimal</u> transition time of 24 ps (per Table 49 of the FDR specification – FDR host output specifications at preset 0, for Limiting Active Cables). In this relation, we understand that the specified test value for the crosstalk calibration transition time of 24 ps is also a minimal value, otherwise it would be nearly impossible to satisfy the test requirements for both the driver and the receiver testing. Specifically, Mellanox transmitters provide signals with larger transition times. Please advise whether our understanding of the specification is correct and signals with 700 mV amplitude and a slower than 24 ps transition time, generated by the transmitters of the tested port satisfy the requirements for the counter-propagating aggressors.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>We have one more question regarding the PF23. To implement our proposed setup for the RX tolerance testing. In case signals with fast transition times (17 ps) need to be generated for the co-propagating aggressors, a multy-channel signal generator is requred during the entire time of the test. Can the Anritsu 14G PPG be at our disposal during PF23?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'>Thank You in Advance and Best Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#244061'><img border=0 width=68 height=53 id="Picture_x0020_1" src="cid:image004.png@01CE1FC0.8AD9E240" alt="Description: Description: Description: Description: Description: Description: cid:image001.png@01CC8CED.AB5E8D20"> </span><b><span style='font-family:"Verdana","sans-serif";color:#244061'>Alexander Rysin<o:p></o:p></span></b></p><p class=MsoNormal><span style='color:#244061'>Sr. Circuit Compliancy & Characterization Engineer | Mellanox Technologies Ltd.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#244061'>Office: +972-74-7237087| Cell: +972-54-4580159| Yokneam, Israel <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p>Attachment saved to <a href="file:///C:\Users\rsdance\Documents\Lamprey\CIWG\Plugfest\2013-04\Documentation\Device%20Technical%20Documents\Rx%20Tolerance%20Tests\icn.m">file:///C:\Users\rsdance\Documents\Lamprey\CIWG\Plugfest\2013-04\Documentation\Device Technical Documents\Rx Tolerance Tests\icn.m</a><o:p></o:p></p><p>Attachment saved to <a href="file:///C:\Users\rsdance\Documents\Lamprey\CIWG\Plugfest\2013-04\Documentation\Device%20Technical%20Documents\Rx%20Tolerance%20Tests\BERTScope_FDR_Device_RX_MOI_v1.00.pdf">file:///C:\Users\rsdance\Documents\Lamprey\CIWG\Plugfest\2013-04\Documentation\Device Technical Documents\Rx Tolerance Tests\BERTScope_FDR_Device_RX_MOI_v1.00.pdf</a><o:p></o:p></p></div></body></html>