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<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Hi Scott,<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Thank you for the changes. Please find my comments as follows;<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">1) Section 4.1.2<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Is it more clear when target PDU format is specified? i.e.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif">When an entity is required to perform checksum calculation of a given type but is for any reason unable to do so, the value of the
checksum shall be zero.</span><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">to<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif">When an entity is required to perform checksum calculation of a given type but is for any reason unable to do so, the value of the
<span style="color:red">file </span>checksum <span style="color:red">in the EOF PDU</span> shall be zero.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Or I would think it is helpful if receiving entity is able to know that the file checksum in the EOF PDU to be received will be
zero because in that case receiving entity don</span><span style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">¡¯<span lang="EN-US">t have to calculate checksum incrementally, which I believe some agencies perform it for time saving because it could
be an issue when big file is transferred. So would it make sense?<o:p></o:p></span></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif">When an entity is required to perform checksum calculation of a given type but is for any reason unable to do so, the value of the
checksum shall be zero.</span><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">to<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif">When an entity is required to perform checksum calculation of a given type but is for any reason unable to do so,
<span style="color:red">the checksum type in the Metadata PDU and the value of the file checksum in the EOF PDU shall be zero.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">If so, the default checksum type for modular checksum should be
</span><span style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">¡®<span lang="EN-US">1</span>¡¯<span lang="EN-US"> or so.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">2) Section 5.2.5<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">I think that 6 for the length of checksum type is too long and some space could be requested for future use. In my opinion, for
interoperable operation an applicable checksum algorithm should be selectable among 2 or 3, which each agency should implement as minimum and mandatory.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">FYI, for example checksum type could be 3 bit for length and value are as follows;<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"> - 0 (no checksum type or checksum operation is not applicable at current transaction) ; I think at the last CCSDS meetings,
we discussed the checksum type of zero (0) would be no checksum, 1 for modular checksum, 2 for CRC32 and so on.<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"> - 1 (CFDP mandatory checksum type #1)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.0pt;word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">- 2 (CFDP mandatory checksum type #2)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.0pt;word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">- 3 (CFDP mandatory checksum type #3)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:10.0pt;word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">- 4 ~ 7 (CFDP user defined checksum type #1 ~ #4)<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Best,<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D">Cheol<o:p></o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="word-break:break-hangul"><span lang="EN-US" style="font-size:10.0pt;font-family:"¸¼Àº °íµñ";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-CFDPV1 <sis-cfdpv1-bounces@mailman.ccsds.org>
<b>On Behalf Of </b>Burleigh, Scott C (312B) via SIS-CFDPV1<br>
<b>Sent:</b> Saturday, May 25, 2019 5:17 AM<br>
<b>To:</b> sis-cfdpv1@mailman.ccsds.org<br>
<b>Cc:</b> osvaldo.peinado@dlr.de; madalier@antarateknik.com; jens.janssen@dlr.de; Thomas Gannett <thomas.gannett@tgannett.net>; Jeremy.Mayer@dlr.de; Cola, Tomaso (Tomaso.deCola@dlr.de) <Tomaso.deCola@dlr.de><br>
<b>Subject:</b> [SIS-CFDPV1] updated CFDP Revisions draft<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hi, all. I have made all the changes to the revised CFDP Blue Book that I think are needed in order to make the file checksum algorithm selectable by reference to the new SANA checksum algorithm registry. The updated
document is now in CWE at <a href="https://cwe.ccsds.org/sis/docs/SIS-CFDPV1/Draft%20Documents/727x0b5%20--%20Specification%20--%20Blue%20Book/727x0p42_working%202.doc?Web=1">
https://cwe.ccsds.org/sis/docs/SIS-CFDPV1/Draft%20Documents/727x0b5%20--%20Specification%20--%20Blue%20Book/727x0p42_working%202.doc?Web=1</a>. Please take a look at it when you have a moment; I¡¯d like to send a final draft to Tom and ask for a supplementary
Agency review soon, maybe as early as next month.<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">Scott<o:p></o:p></span></p>
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