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<p class="MsoNormal">Dear All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><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.<br>
<br>
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">It has been proposed to make the
<b><span style="color:red">following features optional</span></b><o:p></o:p></li></ol>
<ol style="margin-top:0cm" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Link State Change Procedures for Class 1 (maybe mandatory for Class 2)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Suspend / Resume for Class 1 (maybe mandatory for Class 2)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Prompt NAK<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Keep Alive Procedures<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">User Operations (Proxy Operations, Directory Operations, Remote Status Report, Remote Suspend Operations, Remote Resume Operations)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Fault Handler Override<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Messages to User
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:18.0pt;mso-list:l1 level1 lfo3">Flow Labels<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">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).<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">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"><o:p> </o:p></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>
<p class="MsoNormal"><o:p> </o:p></p>
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