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<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Cheol,<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">My understanding of CFDP is that it¡¯s transaction based, where a transaction is aimed at transferring a single file. As
such, transmission of multiple files has to go over different transactions. Moreover, the metadata allow to specify a single file name (source and destination) so that the possibility of sending multiple files with the same put request does not seem to me
possible.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">As to the compression, in my opinion this is something that can happen outside the CFDP operations.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Tomaso<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:normal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> SIS-CFDPV1 <sis-cfdpv1-bounces@mailman.ccsds.org>
<b>On Behalf Of </b>??? via SIS-CFDPV1<br>
<b>Sent:</b> Mittwoch, 7. Dezember 2022 01:49<br>
<b>To:</b> sis-cfdpv1@mailman.ccsds.org<br>
<b>Subject:</b> [SIS-CFDPV1] Multiple file delivery request in a single Metada PDU and compressed delivery....<o:p></o:p></span></p>
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<p class="MsoNormal" align="left" style="text-align:left"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi, CFDP fellow.<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">Recently, I am questioning to myself about how I am able to get multiple files from remote space storage through CFDP.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In the current CFDPv1 specification, we have to send multiple put.request commands to a sending entity as many as needed.<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">Is it possible to think putting multiple file source in a metadata pdu and also possibly compressed by tar, zlib and so on to make it possible?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example, we can compile a metadata pdu as follows when a sending CFDP entity got requests for the aaa.txt bbb.tlm, ccc.img, ddd.dat separately:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.2pt"><span lang="EN-US">File size : file size of compressed file, i.e., size of measurement_data.gz<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.2pt"><span lang="EN-US">Source file name : aaa.txt bbb.tlm, ccc.img, ddd.dat<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.2pt"><span lang="EN-US">Destination file name : measurement_data.gz<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">In my opinion, voluntary compression service by a sending CFDP entity would be good in terms of bandwidth reduction, lower retransmission rate and so on.<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">Cheol<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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