<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Aptos",serif;
color:windowtext;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">During that telco he mentioned that this draft came from a use case they currently have at Aalyria for some customers in the EO context, necessitating the direct encapsulation of bundles into frames. But indeed we could invite him in one
of our weekly DTN telcos, to get some more details.<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>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b>From:</b> Felix Flentge <Felix.Flentge@esa.int> <br>
<b>Sent:</b> Mittwoch, 26. Februar 2025 16:20<br>
<b>To:</b> de Cola, Tomaso <Tomaso.deCola@dlr.de>; sis-dtn@mailman.ccsds.org<br>
<b>Subject:</b> RE: Bundle Transfer Protocol - Unidirectional<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif">The obvious question for me would be how this compares to our current solutions (ie, space and encapsulation packets). In particular, I see some disadvantages of the proposed approach
with padding as it seems we could not have several bundles in a single frame (maybe not a real issue with relatively small frames). Maybe we should invite Rick also to present and discuss with CCSDS.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif">Felix<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Aptos",serif"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><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>Tomaso de Cola via SIS-DTN<br>
<b>Sent:</b> 26 February 2025 14:14<br>
<b>To:</b> <a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> [Sis-dtn] FW: Bundle Transfer Protocol - Unidirectional<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt">Fyi<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">This is something Rick had already inform me and Bob some weeks ago when we did the monthly CCSDS/IETF alignment on DTN activities.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">Regards,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">Tomaso<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b>From:</b> Rick Taylor <<a href="mailto:rick@tropicalstormsoftware.com">rick@tropicalstormsoftware.com</a>>
<br>
<b>Sent:</b> Mittwoch, 26. Februar 2025 14:11<br>
<b>To:</b> <a href="mailto:dtn@ietf.org">dtn@ietf.org</a>; 'Robert C Durst' (<a href="mailto:durst@mitre.org">durst@mitre.org</a>) <<a href="mailto:durst@mitre.org">durst@mitre.org</a>><br>
<b>Subject:</b> [dtn] Bundle Transfer Protocol - Unidirectional<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Just to let you all know I have recently published a personal draft: Bundle Transfer Protocol – Unidirectional.
<a href="https://datatracker.ietf.org/doc/draft-taylor-dtn-btpu/">https://datatracker.ietf.org/doc/draft-taylor-dtn-btpu/</a>
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">The intent is to provide a minimal, efficient wire protocol for transferring Bundles over unidirectional, unreliable frame-based link-layer protocols, such as AOS, TM, 5G PDU and Ethernet.
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">I’m following it up with a related draft covering how to add FEC to BTPU, for cases when selective FEC is useful, and a simple BTPU-over-Ethernet draft, which might be handy in some scenarios.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Also, I would be particularly interested in collaborating with anyone who can help draft a good specification for BTPU over the CCSDS data-frame protocols.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">I hope to find time in our packed WG agenda at IETF-112 to discuss it a bit more.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Many thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Rick<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">This message is intended only for the recipient(s) named above. It may contain proprietary information and/or protected content. Any unauthorised disclosure, use, retention or dissemination is prohibited. If you have
received this e-mail in error, please notify the sender immediately. ESA applies appropriate organisational measures to protect personal data, in case of data privacy queries, please contact the ESA Data Protection Officer (<a href="mailto:dpo@esa.int">dpo@esa.int</a>).
<o:p></o:p></span></p>
</div>
</body>
</html>