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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Holger, Wolfgang, and all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I’ve made a pass through the edited RCF book. My responses to the particular questions that Wolfgang raised are interleaved in
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">red</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> in Holger’s email below. In addition to those responses I have a number of other comments
that were triggered as I read the proposed changes throughout the book. I have also made these comments and proposed changes in the attached marked-up version of Wolfgang’s draft:
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The NOTE in 1.1 makes reference to a future version of the SLE Reference Model combing Rtn MC Frames and Rtn VC Frames. This should be included in the
upcoming update.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">1.6.1.5 c) should be “V<u>irtual</u> C<u>hannel</u> Frame Count Cycle” to match the term from the AOS book and the term used in this (RCF) book.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">1.6.1.5 d) should be “V<u>irtual</u> C<u>hannel</u> Frame Count
<u>Cycle</u> Use [not Usage] Flag” to match the term from the AOS book and the term used in
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">this (RCF) book. . Note that the AOS book calls it “Usage” (in Fig 4-2) but otherwise calls it “Use”,
so we should use “Use”.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">d.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">The “additional definitions” term Frame Version Number (1.6.1.8.6) refers
to the </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">same thing as Transfer Frame Version Number (1.6.1.18). In the text itself, “frame version number” (without the “transfer” prefix) appears only twice, both times in
3.4.2.7.1 NOTE 1. I suggest adding “”transfer” to the two instances in 3.4.2.7.1 NOTE 1 and deleting 1.6.1.8.6 and the reference to it in annex D.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">e.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Editorial comment: there are many instances where phrases along the lines of “TM … or AOS …” have been changed to “TM … or AOS … or USLP …”. The middle
“or”s should be replaced by commas: “TM … </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">,
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">AOS …
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">,</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">or USLP …”. (I have made those changes where I found them in my attached marked-up copy.)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">f.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In 2.4.1 and figure 2-1, I suggest that we start recognize that there already is an ROCF service and that there will never be an SLE-R-FSH service.
See the changes in the attached marked-up copy. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">g.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">2.4.1 NOTE 1 has an added sentence that begins “The condition stated above” that is ambiguous – what condition is being referred to? It’s confusing because
R-S, LDPC, and FECF are discussed in the preceding sentences, but the new sentence mentions only R-S and FECF.</span>.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">h.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">The first two sentences of 2.6.4.4 now read “When an association is released
or aborted, the invocation of further operations by the user or the provider is not permitted. As a consequence, the delivery of frames stops as soon as the RCF-STOP or RCF-PEER-ABORT invocation has been processed by the RCF service provider.”
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">Should “RCF-STOP” be “RCF-UNBIND, since it is the UNBIND that releases the
association?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">To me “RCF-PEER-ABORT invocation has been processed by the RCF service provider”
implies a PEER-ABORT that has been invoked by the user, and therefore the case where the provider self-aborts is not covered by this sentence.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">i.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">Wolfgang’s comment on 2.8 asks if we should move the security considerations
to an annex. Interestingly, CCSDS 401.0 still contains none of this material, even though it is updated almost annually. Probably best to get a ruling from Tom G. If we do move it to an annex, we should also address SANA and patent considerations. Regarding
patent considerations, none apply to SLE ROCF itself, but CCSDS 131.0 lists patent considerations for LDPC.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">j.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">In 3.4.2.7.2 NOTE, I suggest prefacing “00’, ‘01’, and ‘1100’ with “binary”
for clarification.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%"><span style="mso-list:Ignore">k.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100.0%">Regarding the possible need for a PICS Proforma conforming to the current
style, I hope that it is not necessary. As precedent, there have been multiple Blue Books that have been updated since the normative PICS Proforma mandate was declared that have not had such an annex added. For time and resource reasons we should argue that
the RCF book be “grandfathered” in this respect.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I look forward to talking with you on Thursday.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> CSS-CSTS [mailto:css-csts-bounces@mailman.ccsds.org]
<b>On Behalf Of </b>Holger.Dreihahn@esa.int<br>
<b>Sent:</b> Friday, June 19, 2020 3:24 AM<br>
<b>To:</b> css-csts@mailman.ccsds.org; wo_._he@t-online.de<br>
<b>Subject:</b> [Css-csts] RCF for USLP<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear CSTS Colleagues,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Please find on our CWE the RCF Book Wolfgang updated for USLP support:</span>
<br>
<a href="https://cwe.ccsds.org/css/docs/CSS-CSTS/CWE%20Private/SLE%20Services/RCF%20for%20USLP.doc?Web=1"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">https://cwe.ccsds.org/css/docs/CSS-CSTS/CWE%20Private/SLE%20Services/RCF%20for%20USLP.doc?Web=1</span></a>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Please review the changes until our subject meeting on 16th of July. In particular Wolfgang has raised these questions:</span>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
Shall the RCF service also in case of USLP be limited to the delivery of a Master Channel or a Virtual Channel? As the TC space link protocol USLP supports the notion of MAP channels. The attached version of RCF would not support the selection of a MAP channel.
Shall delivery of a MAP channel be a separate service given that only for USLP frames such selection would be feasible. Also, there is no MAP frame counter and consequently reporting of gaps in the stream of MAP channel frames is not possible while we report
such gaps for the frame stream of a VC channel. <span style="color:#1F497D"><br>
</span><span style="color:red">I think that we should keep this at the VC frame level and let the user deal with the MAP channels (as they must do for Return Packet Channels). If someone wants and a Return MAP Channel service it should be proposed as a new
CSTS.</span><o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
RCF reports the frame-sync-lock-status. For the case of variable length USLP frames this parameter does not make sense. Shall we simply specify that this parameter is set 'unknown' when variable length USLP frames are to be delivered?<span style="color:#1F497D">
<br>
</span><span style="color:red">Would it be appropriate to equate ‘in-lock’ with the DECODE state and ‘out-of-lock’ with the INACTIVE and SEARCH states?</span><o:p></o:p></li></ul>
<p class="MsoNormal"><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Looking forward talking to you in July.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Best regards,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Holger</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Holger Dreihahn<br>
European Spacecraft Operations Centre | European Space Agency | S-431<br>
+49 6151 90 2233 | </span><a href="http://www.esa.int/esoc"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">http://www.esa.int/esoc</span></a><o:p></o:p></p>
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