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<p class="MsoNormal">Dear SLS WG Chairs and Deputies,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As you may know CCSDS has organised a Lunar Interoperability Forum to take place after the CESG/CMC meetings in May.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The CESG together with the CMC Chair met once more yesterday to review the status of preparations for this event.
<o:p></o:p></p>
<p class="MsoNormal">Each CCSDS Area is expected to provide a 10-minute presentation as part of the Agenda.<o:p></o:p></p>
<p class="MsoNormal">SEA and CSS had already initiated preparation of their presentations.
<o:p></o:p></p>
<p class="MsoNormal">SLS (me) shared a very preliminary presentation yesterday with the main goal of obtaining feedback, but also further guidance based on a commonly agreed approach on the messages to be delivered.<o:p></o:p></p>
<p class="MsoNormal">Questions about the identification of our audience were discussed.
<o:p></o:p></p>
<p class="MsoNormal">As far as I understand there is no yet a clear view on for instance how knowledgeable about CCSDS this audience will be.<o:p></o:p></p>
<p class="MsoNormal">Nevertheless, one key point I took away was that we all need to emphasize the benefits that our standards bring to those who may want to consider their use.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After the meeting yesterday, Peter released an updated version of the SEA presentation, reflecting our last agreements.<o:p></o:p></p>
<p class="MsoNormal">Therefore, I have updated my initial draft accordingly.<o:p></o:p></p>
<p class="MsoNormal">The current version is sitting at this CWE folder: <a href="https://cwe.ccsds.org/sls/docs/Forms/AllItems.aspx?RootFolder=%2Fsls%2Fdocs%2FSLS%20Area%2FCWE%20Private%2F2024%2D04%2D17%20Lunar%20Interoperability%20Forum%20%2D%20May%202024&FolderCTID=0x012000439B56FF51847E41B5728F9730D7B55F&View=%7BAE8FB44C%2DE80A%2D42CF%2D8558%2DFB495ABB675F%7D">
2024-04-17 Lunar Interoperability Forum - May 2024 - All Documents (ccsds.org)</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please note the following:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Slides 1 and 2 are already commonly agreed to quickly introduce and illustrate the placement of SLS within CCSDS.
<o:p></o:p></p>
<p class="MsoNormal">Note as well that SEA will be the first area, presenting the famous CWE CCSDS organization diagram without getting into much detail for the boxes.<o:p></o:p></p>
<p class="MsoNormal">Peter’s presentation will have the full dynamic aspect for slide 2 whereas all the other areas will take a static view just delimiting the respective area.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Slides 3 and 4 are now aligned with a draft text to the approach that Peter has used to present the WG “products”.<o:p></o:p></p>
<p class="MsoNormal">Please look at what is currently written and feel free to amend the text of your respective working group.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For SDLS, one odd finding is that I have always been using the terms Space Data Link Security (SDLS) whereas CWE names the WG as Space Data Link
<b>Layer</b> Security. <o:p></o:p></p>
<p class="MsoNormal">Hence, I have aligned the name with CWE for this presentation.<o:p></o:p></p>
<p class="MsoNormal">In my previous draft I had tried to reuse the wording contained for each WG in the CCSDS Strategy for SLS.<o:p></o:p></p>
<p class="MsoNormal">Apart from producing a lengthy and somewhat verbose text, one conclusion I reached is that a revision of that text may be necessary and ideally agreed within SLS at our SLS Plenary Meeting in May before submitting it to CESG.<o:p></o:p></p>
<p class="MsoNormal">It would be very useful for Gilles and me that you look at your corresponding WG text and come back with feedback to be discussed at the SLS Plenary.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Slide 5 follows again the template established by Peter but emphasizing the interoperability points at SLS level within the E2E architecture.
<o:p></o:p></p>
<p class="MsoNormal">There was some discussion about the details shown in each node and the risk of this “example” of combining CCSDS standards being interpreted as prescriptive.<br>
It is certainly not my intention to delve beyond the three blue boxes at the bottom that you see in the three nodes relevant to SLS interoperability points.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The difficult part of SLS in my view is what comes next: the selection of the key standards that support Lunar Interoperability and how to “sell” them to the audience in a tabular form (slides 7 and 8).<o:p></o:p></p>
<p class="MsoNormal">When you look at the public CCSDS webpage and search for SLS BBs, you obtain 33 hits!<o:p></o:p></p>
<p class="MsoNormal">I already shared that fact with CESG colleagues and CMC Chair yesterday.<o:p></o:p></p>
<p class="MsoNormal">Perhaps a third slide may be needed.<o:p></o:p></p>
<p class="MsoNormal">The CESG is aware and understanding that we are a special case.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Although I believe I more or less know which SLS standards are expected to show up in this table, I would kindly invite you to identify them for your respective WG, write down their status, synopsis, and crucially, to briefly describe their
benefit(s) in the “Comments” column.<o:p></o:p></p>
<p class="MsoNormal">I believe our colleagues of Data Compression could be exempted from this exercise because although their standards are evolving, as far as I understand there is no anticipated evolution driven by a Lunar communications context. Please confirm.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The CESG will have another check point on preparations next week (23 April).
<o:p></o:p></p>
<p class="MsoNormal">Both Gilles and me may not be able to attend as we will attending a conference in Paris where we together with Bruno Saba will deliver a lecture on CCSDS SDLS and SDLS EPs
<o:p></o:p></p>
<p class="MsoNormal">The CESG is aware of this event and the opportunity we have been given to promote CCSDS standards.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To conclude this long e-mail, I would kindly ask you fill in the standards tables before next Monday evening.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Feel free to contact me and Gilles for any further feedback.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Ignacio<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB">P.D. I have also included a copy of Peter’s presentation for the SEA at the same CWE folder.</span><span style="mso-ligatures:none;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
<br>
</span><b><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Ignacio Aguilar Sánchez</span></b><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Communication Systems Engineer</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Electrical Engineering Department</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
<br>
</span><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">European Space Research and Technology Centre<br>
Keplerlaan 1, PO Box 299, 2200 AG Noordwijk, The Netherlands<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Mob.+31641360257</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Fax +31715655418</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:10.0pt;font-family:NotesEsa;color:#4F4F4F;mso-ligatures:none;mso-fareast-language:EN-GB">Email:
<a href="mailto:ignacio.aguilar.sanchez@esa.int"><span style="color:blue">ignacio.aguilar.sanchez@esa.int</span></a><br>
</span><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><a href="http://www.esa.int/" target="_blank"><span style="font-size:10.0pt;font-family:NotesEsa;color:blue">www.esa.int</span></a></span><span style="mso-ligatures:none;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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