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<div class="WordSection1">
<p class="MsoNormal">Dear All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have uploaded an updated draft for CFDP-B6 to CWE at<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://cwe.ccsds.org/sis/docs/SIS-CFDPV1/Draft%20Documents/727x0b6_WhiteBook/727x0b6_WhiteBook_Issue1.doc?d=w73ace55f918342129a1389e5e40c7a99">https://cwe.ccsds.org/sis/docs/SIS-CFDPV1/Draft%20Documents/727x0b6_WhiteBook/727x0b6_WhiteBook_Issue1.doc?d=w73ace55f918342129a1389e5e40c7a99</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">The change log shoule be pretty up to date. In particular, I have tried to make a lot of the CFDP features optional as discussed in Huntsville (please see below). I hope I have found a good way to
document this in the draft (in particular, please have a look at the additions to Section 7). The PICS is not (fully) updated, yet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">I intend to go through the whole document at the CFDP WG meeting in Den Haag. Please have a look before. In particular, if you cannot participate in the meeting, please sent your comments before
to the mailinglist.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Felix<o:p></o:p></span></p>
</div>
<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" style="margin-left:36.0pt"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Felix Flentge
<br>
<b>Sent:</b> Monday, May 15, 2023 2:32 PM<br>
<b>To:</b> sis-cfdpv1@mailman.ccsds.org<br>
<b>Cc:</b> Austin Stanton <dstanton@keltik.co.uk><br>
<b>Subject:</b> CFDP WG Meeting Huntsville 3/4 - CFDP Simplification (Core CFDP) / Removal of Store-And-Forward Overlay<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">Dear All,<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">We have discussed ways to make CFDP easier to implement, in particular, to allow for a kind of simple ‘core CFDP’ implementation, e.g. for use over Bundle Protocol (we would basically just use CFDP Class 1 and
use CFDP for formatting PDU). The following proposals are on the table<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><b><span style="color:red">Removal of the Store-And-Forward Overlay (Annex B)</span></b><span style="color:red">
</span>– to our knowledge this has never been used in cross-support scenarios and we would argue that multi-hop file delivery shall make use of BP as network layer protocol – Please let us know if there are any objections.<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:54.0pt;mso-list:l2 level1 lfo2">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ul>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>It has been proposed to make the <b><span style="color:red">following features optional</span></b><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Link State Change Procedures for Class 1 (maybe mandatory for Class 2)<br>
<b><span style="font-family:Wingdings;color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%">à</span></b><b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"> I am against
this change: even for Class 1 over bundle protocol it may be required; e.g. consider the case that the bundle storage is full; in this case there is no transmission opportunity; on the receiver side, reception opportunity should at least be stopped when there
is no contact</span></b><br>
<br>
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Suspend / Resume for Class 1 (maybe mandatory for Class 2)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:54.0pt;mso-list:l2 level1 lfo2">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ul>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Prompt NAK<o:p></o:p></p>
<ol style="margin-top:0cm" start="4" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">e)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Keep Alive Procedures<o:p></o:p></p>
<ol style="margin-top:0cm" start="6" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoListParagraph" style="margin-left:90.0pt"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">g)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>User Operations (Proxy Operations, Directory Operations, Remote Status Report, Remote Suspend Operations, Remote Resume Operations)<o:p></o:p></p>
<ol style="margin-top:0cm" start="8" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">i)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Fault Handler Override<o:p></o:p></p>
<ol style="margin-top:0cm" start="10" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">k)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Messages to User <o:p></o:p></p>
<ol style="margin-top:0cm" start="12" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:90.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">m)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Flow Labels<o:p></o:p></p>
<ol style="margin-top:0cm" start="14" type="a">
<li class="MsoListParagraph" style="color:#70AD47;margin-bottom:12.0pt;margin-left:18.0pt;mso-list:l1 level1 lfo3">
<b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><span style="color:windowtext">IMPLEMENTED</span></span></b><span style="color:#548235;mso-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:72.0pt">
We also discussed whether a CFDP entity should silently ignore not supported features or signal to the requesting entity via a condition code in EOF/Finished PDU (which would also mean cancelling the transaction).<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt">Please let us know whether you would like to keep some of those mandatory and how an entity should respond to not supported features (which may depend on the not supported feature, e.g. for User Operations it
could make sense to cancel, while it may be a bit harsh for a Prompt NAK).<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"><span style="mso-fareast-language:EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="mso-fareast-language:EN-GB">Felix<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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