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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Keith,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I agree with your point on troubles in maintaining two books and the fact that this will imply the same treatment for BPv7. Then whether agencies are happy to refer to a silver book rather than a
blue book is a bit question mark in my opinion. I remember we decided a few years ago not to silverize SCPS-TP exactly because there were activities or usage of the corresponding blue book.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">We can certainly bring this matter to the next CESG meeting, although I fear that there might be no strict decision in this regard, since I think there is no specific rule again either approaches
and the hot potato could be sent back to WG.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Tomaso<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Dr. Keith L Scott <kscott@mitre.org>
<br>
<b>Sent:</b> Freitag, 8. Oktober 2021 15:52<br>
<b>To:</b> Cola, Tomaso de <Tomaso.deCola@dlr.de>; marc.sanchez.net@jpl.nasa.gov<br>
<b>Cc:</b> sis-dtn@mailman.ccsds.org<br>
<b>Subject:</b> Re: [EXT] RE: LTP vs LTPv2<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I don’t like it, but I propose that the WG move forward with developing the book and you bring up the new-version vs. new-book issue to the CESG.<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">Reasons I don’t like the two-book solution:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo3"><span lang="EN-US">So now we’re maintaining two versions of LTP, which version are folks supposed to choose for missions going forward? They’ll choose the one with flight heritage,
right?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo3"><span lang="EN-US">We’ll have to do the same thing with BPv7<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo3"><span lang="EN-US">There’s a version number in the header; receivers will know what was sent.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo3"><span lang="EN-US">The book as Silver is still reference-able. If folks have systems they’re building to the current (v1) book, they can switch to referencing the silver book.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo3"><span lang="EN-US">Why don’t we do that with ALL CCSDS books, backward-compatible or not?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">--keith<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-bottom:12.0pt"><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"><a href="mailto:Tomaso.deCola@dlr.de">Tomaso.deCola@dlr.de</a> <<a href="mailto:Tomaso.deCola@dlr.de">Tomaso.deCola@dlr.de</a>><br>
<b>Date: </b>Friday, October 8, 2021 at 4:19 AM<br>
<b>To: </b><a href="mailto:marc.sanchez.net@jpl.nasa.gov">marc.sanchez.net@jpl.nasa.gov</a> <<a href="mailto:marc.sanchez.net@jpl.nasa.gov">marc.sanchez.net@jpl.nasa.gov</a>>, Dr. Keith L Scott <<a href="mailto:kscott@mitre.org">kscott@mitre.org</a>><br>
<b>Cc: </b><a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a> <<a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject: </b>[EXT] RE: LTP vs LTPv2<o:p></o:p></span></p>
</div>
<p class="MsoNormal">Then probably we should better keep two books, one with the “old LTP” for which we’ll do some pink sheets to fix some inconsistencies and another one (the new LTP). In such a away we could have two versions of LTP available, similarly to
IPv4 and IPv6 in IETF. Probably we may have to slightly change the title of the books (v1 and v2?) to have a clear demarcation between the two version of the protocols and avoid any ambiguity.<o:p></o:p></p>
<p class="MsoNormal"><a id="OWAAM96555CF48B764E5BAB1B13676ABD30FC" href="mailto:kscott@mitre.org"><span style="font-family:"Calibri",sans-serif;text-decoration:none">@Scott, Keith L.</span></a>:what do you think?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tomaso<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Sanchez Net, Marc (US 332H) via SIS-DTN<br>
<b>Sent:</b> Donnerstag, 7. Oktober 2021 00:21<br>
<b>To:</b> <a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> [Sis-dtn] LTP vs LTPv2<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<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">I had to leave today’s meeting early. Did we reach consensus on how to proceed?<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">Also, I will note that some colleagues at JPL (I have similar concerns) do not really like the idea of turning the current version of LTP into a silver book. The problem is that, by definition, a silver book implies that
a protocol is deprecated or obsolete, but several systems that are being built today use BPv6+LTP or BPv7+LTP and thus might be in operation for a long time. So, essentially, we are “telling” industry that they have developed an already obsolete standard?<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,<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">Marc Sanchez Net<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;color:gray">Telecommunications Engineer</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="font-size:10.0pt;color:gray">Jet Propulsion Laboratory<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="font-size:10.0pt;color:gray">Office:</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span lang="EN-US" style="color:black"><a href="tel:(818)%20393-5840" target="_blank"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">(818)
354-1650</span></a></span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span lang="EN-US" style="font-size:10.0pt;color:gray">|</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span lang="EN-US" style="font-size:10.0pt;color:gray">Email:</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span lang="EN-US" style="color:black"><a href="mailto:marc.sanchez.net@jpl.nasa.gov"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue">marc.sanchez.net@jpl.nasa.gov</span></a></span><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222"><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"><o:p> </o:p></span></p>
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