<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Victor, if you want to push in this direction, the decision shall be agreed with the other two WGs that make much wider use of those diagrams.<div>Regards </div><div>Gian Paolo<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On 21. May 2021, at 17:57, Sank, Victor J.(GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via SLS-SLP <sls-slp@mailman.ccsds.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">In order to make some attempt to standardize the LFSRs and their associated polynomial in CCSDS, I would suggest that we use a standard for cell labeling that makes a simple association with the polynomial
as in MatLab. If you don’t like the MatLab convention, pick something and lets make it a standard for the NASA documents. Eventually maybe we can get CCSDS to accept the standard.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> They are a standards organization aren’t they?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Victor<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt">From:</span></b><span style="font-size:11.0pt"> Kazz, Greg J (US 312B) <greg.j.kazz@jpl.nasa.gov>
<br>
<b>Sent:</b> Friday, May 21, 2021 11:31 AM<br>
<b>To:</b> Andrews, Kenneth S (JPL-332B)[JPL Employee] <kenneth.s.andrews@jpl.nasa.gov><br>
<b>Cc:</b> Sank, Victor J. (GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] <victor.j.sank@nasa.gov>; Kazz, Greg J (US 312B) via SLS-SLP <sls-slp@mailman.ccsds.org>; Andrea Modenini (external) <Andrea.Modenini@esa.int><br>
<b>Subject:</b> LFSR OID frame RIDs affecting USLP, TM, AOS SDLPs<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Ken,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The SLP WG decided to put both of your diagrams into a new non-normative annex in USLP, TM, and AOS.<o:p></o:p></p>
<p class="MsoNormal">The text in the normative part of the link layer books will state:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="Paragraph5" style="mso-list:none">The TFDZ of an OID Transfer Frame shall be generated by use of a 32-cell Linear Feedback Shift Register (LFSR) with polynomial 1 + D + D<sup>2</sup> + D<sup>22</sup> +D<sup>32</sup><span style="font-family:"Courier New"">,
see Annex X.</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Where Annex X is TBD and will be added by me to the document.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have some questions and requests for you:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo5"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Why does the initialization data differ from one figure to the other one?</span><span style="font-size:13.5pt;font-family:-webkit-standard;color:black"> </span><span style="font-size:11.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo5">The ‘1’ in the figures are misleading to some WG members, please replace ‘1’ with D sub zero i.e., D<sup>0</sup> in the figures.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo5">Consensus of WG was to specify the initialization vector
<span style="background:yellow;mso-highlight:yellow">in both of the diagrams</span><o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="background:yellow;mso-highlight:yellow">New Info:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="background:yellow;mso-highlight:yellow"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="background:yellow;mso-highlight:yellow">Do you concur with these changes ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="background:yellow;mso-highlight:yellow">If so, the SLP WG will wait for your modifications to those diagrams and thereafter I will insert them into the AOS, USLP, and TM pink sheets.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="background:yellow;mso-highlight:yellow">When might we receive them ?</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal">Greg<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Greg Kazz<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Principal Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Technical Group Supervisor,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">PSSE/EEISE/PPSE (312B)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Jet Propulsion Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">4800 Oak Grove Dr., M/S 301-490<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-MX" style="font-size:11.0pt">Pasadena, CA 91109</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-MX" style="font-size:11.0pt">1+(818)393 6529(voice)</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">1</span><span lang="ES-MX" style="font-size:11.0pt">+(818)393 6871(fax)</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES-MX" style="font-size:11.0pt">email: <a href="mailto:greg.j.kazz@jpl.nasa.gov">
greg.j.kazz@jpl.nasa.gov</a> </span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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