<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 12 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
        {font-family:宋体;
        panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
        {font-family:"Cambria Math";
        panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
        {font-family:华文细黑;
        panose-1:2 1 6 0 4 1 1 1 1 1;}
@font-face
        {font-family:"\@宋体";
        panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
        {font-family:"\@华文细黑";
        panose-1:2 1 6 0 4 1 1 1 1 1;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0cm;
        margin-bottom:.0001pt;
        font-size:12.0pt;
        font-family:宋体;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
        {mso-style-priority:99;
        color:purple;
        text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
        {mso-style-priority:99;
        mso-style-link:"批注框文本 Char";
        margin:0cm;
        margin-bottom:.0001pt;
        font-size:9.0pt;
        font-family:宋体;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
        {mso-style-priority:34;
        margin:0cm;
        margin-bottom:.0001pt;
        text-align:justify;
        text-justify:inter-ideograph;
        text-indent:21.0pt;
        font-size:10.5pt;
        font-family:"Calibri","sans-serif";}
span.Char
        {mso-style-name:"批注框文本 Char";
        mso-style-priority:99;
        mso-style-link:批注框文本;
        font-family:宋体;}
span.EmailStyle20
        {mso-style-type:personal;
        font-family:"Calibri","sans-serif";
        color:#1F497D;}
span.EmailStyle21
        {mso-style-type:personal;
        font-family:"Calibri","sans-serif";
        color:#1F497D;}
span.EmailStyle22
        {mso-style-type:personal;
        font-family:"Calibri","sans-serif";
        color:#1F497D;}
span.EmailStyle23
        {mso-style-type:personal;
        font-family:"Calibri","sans-serif";
        color:#1F497D;}
span.EmailStyle24
        {mso-style-type:personal-reply;
        font-family:"Calibri","sans-serif";
        color:#1F497D;}
.MsoChpDefault
        {mso-style-type:export-only;
        font-size:10.0pt;}
@page WordSection1
        {size:612.0pt 792.0pt;
        margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.WordSection1
        {page:WordSection1;}
/* List Definitions */
@list l0
        {mso-list-id:551577867;
        mso-list-type:hybrid;
        mso-list-template-ids:-379936584 1677781380 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
        {mso-level-text:"\(%1\)";
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        margin-left:18.0pt;
        text-indent:-18.0pt;}
@list l0:level2
        {mso-level-number-format:alpha-lower;
        mso-level-text:"%2\)";
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        margin-left:42.0pt;
        text-indent:-21.0pt;}
@list l0:level3
        {mso-level-tab-stop:108.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level4
        {mso-level-tab-stop:144.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level5
        {mso-level-tab-stop:180.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level6
        {mso-level-tab-stop:216.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level7
        {mso-level-tab-stop:252.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level8
        {mso-level-tab-stop:288.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level9
        {mso-level-tab-stop:324.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1
        {mso-list-id:599874034;
        mso-list-type:hybrid;
        mso-list-template-ids:-496337632 -1588823412 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l1:level1
        {mso-level-number-format:alpha-lower;
        mso-level-text:"\(%1\)";
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level2
        {mso-level-tab-stop:72.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level3
        {mso-level-tab-stop:108.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level4
        {mso-level-tab-stop:144.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level5
        {mso-level-tab-stop:180.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level6
        {mso-level-tab-stop:216.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level7
        {mso-level-tab-stop:252.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level8
        {mso-level-tab-stop:288.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level9
        {mso-level-tab-stop:324.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2
        {mso-list-id:1448699333;
        mso-list-type:hybrid;
        mso-list-template-ids:1669517648 1063686588 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l2:level1
        {mso-level-number-format:alpha-upper;
        mso-level-text:"\(%1\)";
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level2
        {mso-level-tab-stop:72.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level3
        {mso-level-tab-stop:108.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level4
        {mso-level-tab-stop:144.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level5
        {mso-level-tab-stop:180.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level6
        {mso-level-tab-stop:216.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level7
        {mso-level-tab-stop:252.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level8
        {mso-level-tab-stop:288.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2:level9
        {mso-level-tab-stop:324.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
ol
        {margin-bottom:0cm;}
ul
        {margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1027" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="ZH-CN" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">HI All,&nbsp;</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I have a question related &nbsp;to &nbsp;SAS TX&nbsp; RX&nbsp; common mode return loss</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">A</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">ccording to the SAS 3r06, &nbsp;&nbsp;for 12Gbps TX,
 the common mode loss requirement is </span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">based on&nbsp;
<b><i>Table 47, </i></b></span><b><i><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;-12 Gbit/s maximum limits for S-parameters at Its OR CTS</span></i></b><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">,
 the common mode return loss SCC22 start at -6 dB at low freq. band,&nbsp; w</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">hich is measured
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;according to
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;method</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp; based on<b><i> Figure F. 19</i></b></span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">,</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
 using de=embedding to reach the connector footprint according to the&nbsp; the document ( Section
<b><i>F.11.4.4,&nbsp; Tx Rx connection S11 measurements at IT or CT</i></b>).</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Which means, &nbsp;after de-embedding, &nbsp;TX or RX return loss is mainly influenced by the connector, if the return loss of &nbsp;SAS&nbsp; connector is high</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
 than -6 dB at lower freq. band</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">,&nbsp; it will make the return loss of the device can not meet the spec. of TX or RX side of SAS device.</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Unfortun</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">at</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">ely,
 the&nbsp; SAS connector requirement is </span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">defined in<b><i> Table 7,</i></b>which is start at -3 dB at low freq. band..</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Compare Table 47 (return loss requirement of&nbsp; SAS device) and Table 7 (return loss of&nbsp; SAS connector ) , &nbsp;the common mode return loss of connector
 is about -3 dB</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"> at low freq. band</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">, while
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;the common mode return loss of &nbsp;SAS</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp; device is &nbsp;-6 dB</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
 at low freq. band</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">, which make it is very hard for &nbsp;the&nbsp; device’s common mode return loss &nbsp;to pass -6 dB spec. &nbsp;at
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;some
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">low</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;frequency band.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Is there anything wrong&nbsp; with my analysis ?</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black">Best regards<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;text-align:justify;text-justify:inter-ideograph">
<span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black">Jia Gongxian/</span><span style="font-size:10.0pt;color:black">贾功贤</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black">Phone: 0755</span><span style="font-size:10.0pt;font-family:华文细黑;color:black">-<span lang="EN-US">89651131
<br>
Email: <a href="mailto:jgxian@huawei.com">jgxian@huawei.com</a> <br>
Huawei Technologies Co., Ltd./</span></span><span style="font-size:10.0pt;color:black">华为技术有限公司</span><span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black"><br>
Bantian, Longgang District,Shenzhen 518129, P.R.China/</span><span style="font-size:10.0pt;color:black">深圳市龙岗区坂田华为基地,</span><span lang="EN-US" style="font-size:10.0pt;font-family:华文细黑;color:black">518129<br>
<a href="http://www.huawei.com">http://www.huawei.com</a></span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:7.5pt;font-family:华文细黑;color:gray">-------------------------------------------------------------------------------------------------------------------------------------<br>
</span><span style="font-size:7.5pt;color:gray">本邮件及其附件含有华为公司的保密信息,仅限于发送给上面地址中列出的个人或群组。禁</span><span lang="EN-US" style="font-size:7.5pt;font-family:华文细黑;color:gray"><br>
</span><span style="font-size:7.5pt;color:gray">止任何其他人以任何形式使用(包括但不限于全部或部分地泄露、复制、或散发)本邮件中</span><span lang="EN-US" style="font-size:7.5pt;font-family:华文细黑;color:gray"><br>
</span><span style="font-size:7.5pt;color:gray">的信息。如果您错收了本邮件,请您立即电话或邮件通知发件人并删除本邮件!</span><span lang="EN-US" style="font-size:7.5pt;font-family:华文细黑;color:gray"><br>
</span><span lang="EN-US" style="font-size:7.5pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:gray">This e-mail and its attachments contain confidential information from HUAWEI, which
<br>
is intended only for the person or entity whose address is listed above. Any use of the
<br>
information contained herein in any way (including, but not limited to, total or partial
<br>
disclosure, reproduction, or dissemination) by persons other than the intended <br>
recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by
<br>
phone or email immediately and delete it!</span><span lang="EN-US" style="font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
</div>
</div>
</body>
</html>