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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Sure,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I would suggest to update to
<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">4.1.3.1 The CRC computation algorithm shall be the standard CCSDS Telecommand CRC<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">algorithm specified in
<b>4.1.4.2.2</b> of the CCSDS <b>TC Space Data Link Protocol </b>(reference [4]).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">With <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US">[4] </span>
<i><span style="font-size:12.0pt;font-family:"TimesNewRomanPS-ItalicMT",serif">TC Space Data Link Protocol</span></i><span style="font-size:12.0pt;font-family:"TimesNewRomanPSMT",serif">. Issue
<b>4</b>. Recommendation for Space Data System<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"TimesNewRomanPSMT",serif">Standards (Blue Book), CCSDS
<b>232.0-B-4</b>. Washington, D.C.: CCSDS, <b>October 2021</b>.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">(B4 is the latest version)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Felix<o:p></o:p></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Wiegand, Robert E. (GSFC-5830) <robert.e.wiegand@nasa.gov>
<br>
<b>Sent:</b> 06 December 2022 16:34<br>
<b>To:</b> Felix Flentge <Felix.Flentge@esa.int><br>
<b>Subject:</b> RE: [EXTERNAL] [SIS-CFDPV1] CFDP Blue Book Pink Sheets & UT Layer Magenta Book<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">Sorry about all the details below. It appears that an incorrect external reference in 727.0-B-5 makes the per PDU CRC 4.1 CRC PROCEDURES ambiguous.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">727.0-B-5 says about per PDU CRCs:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:36.0pt"><span lang="EN-US">4.1.3 CRC VALIDATION PROCEDURE<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:36.0pt"><span lang="EN-US">4.1.3.1 The CRC computation algorithm shall be the standard CCSDS Telecommand CRC<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">algorithm specified in 4.2.1.3 of the CCSDS Telecommand Recommendation (reference [4]).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">Unfortunately, reference [4] TC Space Data Link Protocol. Issue 3. Recommendation for Space Data System Standards (Blue Book), CCSDS 232.0-B-3.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">has section 4.2.1.3 CLCW Version Number (i.e., does not define a CRC).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">Going back through versions of the CFDP Blue Books, I found that 727.0-B-1 had the same content for 4.1.3 and 4.1.3.1, but a different reference.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span lang="EN-US">727.0-B-1 reference [4]<br>
[4] Telecommand Part 2 Data Routing Service. Recommendation for Space Data System Standards, CCSDS 202.0-B-3. Blue Book. Issue 3. Washington, D.C.: CCSDS, June 2001.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">202.0-B-3 section 4.2.1.3 Transfer Frame Error Control Field and its subsections define the same CRC as<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:36.0pt"><span lang="EN-US">232.0-B-3 section 4.1.4 FRAME ERROR CONTROL FIELD<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">more precisely the 16 bit checksum using polynomial in 4.1.4.2.2.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">Can 727-B-5 be updated to address this?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">thank you<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US">bob<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-CFDPV1 <<a href="mailto:sis-cfdpv1-bounces@mailman.ccsds.org">sis-cfdpv1-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Felix Flentge via SIS-CFDPV1<br>
<b>Sent:</b> Friday, October 21, 2022 9:23 AM<br>
<b>To:</b> <a href="mailto:sis-cfdpv1@mailman.ccsds.org">sis-cfdpv1@mailman.ccsds.org</a><br>
<b>Subject:</b> [EXTERNAL] [SIS-CFDPV1] CFDP Blue Book Pink Sheets & UT Layer Magenta Book<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></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">In the WG meeting today we decided to start work on the pink sheets for the CFDP Blue Book and update the current Magenta Book to include BP, LTP, TCP and UDP UT Layers.<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">You find the related projects in CWE:<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 lang="EN-US"><a href="https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcwe.ccsds.org%2Ffm%2FLists%2FProjects%2FDispFormDraft.aspx%3Fid%3D760%26Source%3Dhttp%3A%2F%2Fcwe.ccsds.org%2Ffm%2FLists%2FProjects%2FAllOpenChartersWithDraftProjects.aspx&data=05%7C01%7CFelix.Flentge%40esa.int%7C9ea1f57ce02440cb266208dad7a10be2%7C9a5cacd02bef4dd7ac5c7ebe1f54f495%7C0%7C0%7C638059383940648573%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=OtfltwkmOfsVGGc0o4l38gzTz%2B1ed%2FwF6LGeR%2B33qLU%3D&reserved=0"><span lang="EN-GB">https://cwe.ccsds.org/fm/Lists/Projects/DispFormDraft.aspx?id=760&Source=http://cwe.ccsds.org/fm/Lists/Projects/AllOpenChartersWithDraftProjects.aspx</span></a></span><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 lang="EN-US"><a href="https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcwe.ccsds.org%2Ffm%2FLists%2FProjects%2FDispFormDraft.aspx%3Fid%3D761%26Source%3Dhttp%3A%2F%2Fcwe.ccsds.org%2Ffm%2FLists%2FProjects%2FAllOpenChartersWithDraftProjects.aspx&data=05%7C01%7CFelix.Flentge%40esa.int%7C9ea1f57ce02440cb266208dad7a10be2%7C9a5cacd02bef4dd7ac5c7ebe1f54f495%7C0%7C0%7C638059383940648573%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IklEIOiRUZHbYTHpBH6Xrz11cC%2B5u9O2rkfrKPnC%2Fe8%3D&reserved=0"><span lang="EN-GB">https://cwe.ccsds.org/fm/Lists/Projects/DispFormDraft.aspx?id=761&Source=http://cwe.ccsds.org/fm/Lists/Projects/AllOpenChartersWithDraftProjects.aspx</span></a></span><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">Please let me know whether you have any issues or comments.<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">Felix<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 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
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<o:p></o:p></p>
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