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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Dear Greg,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">Sorry for not being able to join the SLP meeting yesterday but I had another meeting at the same time that lasted more than scheduled.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">For the issue you raised concerning the applicability of SDLS to truncated USLP frames, I will add it to the discussion of the SDLS WG on Wednesday. My feeling is that,
also security would be needed on those emergency commands, the fact that minimum length for Security Header is something like 6 octets (TC baseline mode for SDLS) and minimum length for Security Trailer is something like 16 octets (TC baseline mode for SDLS)
would make it :<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">impossible to fit a truncated USLP Transfer Frame into a 7 octets BCH codeblock (truncated USLP Transfer Frame header is 5 octets leaving only 2 octets for data
field)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">only possible to fit a truncated USLP Transfer Frame into a 32 octets LDPC codeblock (leaving only 27 octets for data field – 22 octets being taken by Security
and Trailer)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">We will discuss it further with the SDLS WG. I do not know whether shorter Security Header and Trailer can be envisioned for those emergency commands carried in truncated
USLP Transfer Frames.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">See you (virtually) this afternoon for the SLP webmeeting. I will provide input for the TM and AOS pink sheets regarding MCID/VCID validation in order to align TM/AOS with
TC/USLP regarding this validation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">Gilles
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Gilles MOURY</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D">
<br>
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">CNES Toulouse</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D">
</span><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">De :</span></b><span lang="EN-US"> Kazz, Greg J (US 312B) <greg.j.kazz@jpl.nasa.gov>
<br>
<b>Envoyé :</b> lundi 26 octobre 2020 18:45<br>
<b>À :</b> Moury Gilles <Gilles.Moury@cne</span>s.fr>; sls-sdls@mailman.ccsds.org<br>
<b>Cc :</b> Kazz, Greg J (US 312B) via SLS-SLP <sls-slp@mailman.ccsds.org><br>
<b>Objet :</b> Does SDLS apply to USLP truncated transfer frame ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Dear Gilles and SLDS WG,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SLP WG has a question regarding the application of the SDLS protocol to truncated USLP Transfer Frames.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">These truncated frames are envisioned for very short length telecommands or forward link Proximity-1 link commanding. This frame type provides backward compatibility with TC hardware commands or immediate commands. These
commands are typically 2 octets long. We envision the truncated USLP frame length to be between 8 and 32 octets.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In that context, does it make sense for SDLS header and possibly SDLS trailer to apply to the USLP truncated frame.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The discussion of the proposed non-use of SDLS for truncated USLP frames is mentioned in Chapter 6, specifically in Section 6.3.2. The definition of the truncated USLP frame is in Annex G of the attached draft document<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The SLP WG did not think SDLS should be applicable to truncated USLP frames, but we would like your opinion on this matter.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Greg Kazz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Chair SLP WG<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:12.0pt;color:black">From:
</span></b><span lang="EN-US" style="font-size:12.0pt;color:black">SLS-SLP <<a href="mailto:sls-slp-bounces@mailman.ccsds.org">sls-slp-bounces@mailman.ccsds.org</a>> on behalf of Matthew Cosby <<a href="mailto:Matt.Cosby@Goonhilly.org">Matt.Cosby@Goonhilly.org</a>><br>
<b>Date: </b>Monday, October 26, 2020 at 9:27 AM<br>
<b>To: </b>"<a href="mailto:sls-slp@mailman.ccsds.org">sls-slp@mailman.ccsds.org</a>" <<a href="mailto:sls-slp@mailman.ccsds.org">sls-slp@mailman.ccsds.org</a>><br>
<b>Subject: </b>[EXTERNAL] [Sls-slp] Updated Book<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US">All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here is the updated book from the working group today.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards, Matt.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">Matthew Cosby</span></b><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">Chief Technology Officer
</span></b><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">Goonhilly Earth Station Ltd</span></b><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB"><img border="0" width="801" height="87" style="width:8.3472in;height:.9097in" id="Picture_x0020_7" src="cid:image001.jpg@01D6AC56.134A7520"></span></b><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-GB"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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