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Hi SIS-DTN - </div>
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FWIW, I want to emphasize that the CESG does a great job in this regard (fixing issues that arise in WGs or inter-WG conflicts or inter-agency conflicts).</div>
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-- Keith was a member of the CESG for several years and understands this vital role that the CESG plays in issues such as this</div>
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Thus, my <b>two cents worth</b> is await CESG advice as well as Keith already stated (I wanted to maybe ease any queasiness in regard to CESG involvement/inputs).</div>
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Thanks.</div>
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Kevin</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> SIS-DTN <sis-dtn-bounces@mailman.ccsds.org> on behalf of Dr. Keith L Scott <kscott@mitre.org><br>
<b>Sent:</b> Friday, October 8, 2021 12:49 PM<br>
<b>To:</b> Tomaso.deCola@dlr.de <Tomaso.deCola@dlr.de>; marc.sanchez.net@jpl.nasa.gov <marc.sanchez.net@jpl.nasa.gov><br>
<b>Cc:</b> sis-dtn@mailman.ccsds.org <sis-dtn@mailman.ccsds.org><br>
<b>Subject:</b> Re: [Sis-dtn] [EXT] RE: LTP vs LTPv2</font>
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<p class="x_MsoNormal">OK fine, if the CESG decides to not rule on it, great, we’ll make a decision in the WG and they can live with it (and we can certainly discuss it SOME in the WG; don’t want to put too much time into it until the CESG is at least given
a chance to get us out of this).</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal"> --keith</p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt; color:black">From:
</span></b><span style="font-size:12.0pt; color:black">Tomaso.deCola@dlr.de <Tomaso.deCola@dlr.de><br>
<b>Date: </b>Friday, October 8, 2021 at 10:04 AM<br>
<b>To: </b>Dr. Keith L Scott <kscott@mitre.org>, marc.sanchez.net@jpl.nasa.gov <marc.sanchez.net@jpl.nasa.gov><br>
<b>Cc: </b>sis-dtn@mailman.ccsds.org <sis-dtn@mailman.ccsds.org><br>
<b>Subject: </b>RE: [EXT] RE: LTP vs LTPv2</span></p>
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<p class="x_MsoNormal"><span lang="EN-GB">Hi Keith,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">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.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB">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.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Regards,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Tomaso</span></p>
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<p class="x_MsoNormal"><b>From:</b> 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</p>
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<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal">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.</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Reasons I don’t like the two-book solution:</p>
<p class="x_MsoNormal"> </p>
<ul type="disc" style="margin-top:0in">
<li class="x_MsoListParagraph" style="margin-left:0in">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?</li><li class="x_MsoListParagraph" style="margin-left:0in">We’ll have to do the same thing with BPv7</li><li class="x_MsoListParagraph" style="margin-left:0in">There’s a version number in the header; receivers will know what was sent.</li><li class="x_MsoListParagraph" style="margin-left:0in">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.</li><li class="x_MsoListParagraph" style="margin-left:0in">Why don’t we do that with ALL CCSDS books, backward-compatible or not?</li></ul>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal" style="margin-left:.5in">--keith</p>
<p class="x_MsoNormal" style="margin-left:.5in"> </p>
<p class="x_MsoNormal"> </p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt; color:black">From:
</span></b><span 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</span></p>
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<p class="x_MsoNormal"><span lang="EN-GB">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.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"><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?</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Tomaso</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
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<p class="x_MsoNormal"><b>From:</b> 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</p>
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<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal">All,</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">I had to leave today’s meeting early. Did we reach consensus on how to proceed?</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">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?</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Best,</p>
<p class="x_MsoNormal">-----------------------------------------------------------------------------------------------------------------------</p>
<p class="x_MsoNormal">Marc Sanchez Net</p>
<p class="x_MsoNormal"><span style="font-size:10.0pt; color:gray">Telecommunications Engineer</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:10.0pt; color:gray">Jet Propulsion Laboratory</span></p>
<p class="x_MsoNormal" style="background:white"><span style="font-size:10.0pt; color:gray">Office:</span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#222222"> </span><span 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)
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</span><span style="font-size:10.0pt; color:gray">Email:</span><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:#222222"> </span><span 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 style="font-size:9.5pt; font-family:"Arial",sans-serif; color:#222222"></span></p>
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