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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Nestor,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I know that this is a late input, but after reading the IOAG Svc Cat #1 I have a very real concern that I think needs to be surfaced. Four new services have been introduced, the "Forward/Return
CFDP-File Service Type" and the "Forward/Return PACKETS-File Service Type". In reading through the descriptions I find that they mention certain SM characteristics, but fail to acknowledge the required presence of a whole lot of "packet / file / frame plumbing"
that is missing in most of our current systems. Of particular concern, from a standards and logistics point of view, is that these new standards require a lot of the "plumbing" that CSTS F-Frame is supposed to provide, but make no mention of that standard.
In fact, the precursor standards, "Forward Synchronous Encoded Frame Service Type" has been dropped, and what is left is just some sort of weak "forward reference" to a CSTS F-Frame service.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I think this is a huge mistake and that we should push back on it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Here is the logic behind this:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:Calibri"><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">FF-CSTS includes the key services and functions that are required for anything like forward file, or forward packet, or forward DTN to work.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:Calibri"><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">These functions include, quoting from the report "Users shall be aware that IOAG Service Catalog 2 foresees a future CSTS Forward Frame Service that is assumed will provide a
forward service for [AOS] and [TC-DLP] frames implementing multiplexing, frame fill and coding in the provider and implementing the full stack down to the physical layer."<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:Calibri"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">In order to implement a forward file or packet service all of these functions,
<b><i>plus</i></b> frame creation, must be present in the service provider.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:Calibri"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:Calibri">It makes little technical sense to create forward file and forward packet services, as new separate services that embed all of these function, instead of creating the FF-CSTS
service and then building CFDP and Packet service "plug-ins" on top of that which use this underlying service.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">In fact, this approach is exactly how the forward file service is now described in the SCCS-ADD. I draw your attention to CCSDS 901.1-M-1, sec 5.2.2.2 and sec 6.2.2.2. In fact, fig 6-4
shows the relationships among SM, CSTS F-Frame, the associated functions that are required, including ranging, and also SLE R-AF, and fig 6-8 (ABA ESLT Forward-File Protocol Building Blocks) shows how F-Frame and Fwd frame are designed to be integrated. Any
sort of forward packet service ought to just be a variant of this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">My recommendation is that CCSDS push back on this IOAG Cat 1 request for two new stand alone services and instead argue that CSTS F-Frame should be done first, and these other new service
built upon that base.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Regards, Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black">CESG <cesg-bounces@mailman.ccsds.org> on behalf of Nestor Peccia <Nestor.Peccia@esa.int><br>
<b>Date: </b>Thursday, September 15, 2016 at 3:43 AM<br>
<b>To: </b>CCSDS Engineering Steering Group - CESG Exec <cesg@mailman.ccsds.org><br>
<b>Subject: </b>[CESG] IOAG: Service Catalogue #1<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><u><span style="font-size:10.0pt;font-family:"sans-serif","serif";color:red">REMINDER</span></u>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Please let me have your comments (in particular from the CSS Area) by 22nd Sept 2016 cob.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">ciao</span> <br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">nestor</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">============================</span>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Dear all,</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Please find attached the Service Catalogue #1 that has been approved by the IOAG.
</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">You should be aware that the final approval regarding the editorial updates from NASA is still pending. There is an on-going discussion
</span><span style="font-size:10.0pt;font-family:Calibri">concerning service management “function” vs. service management “service”.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">However, this version is good enough to be processed by the CESG.</span>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">[attachment "IOAG Service Catalog One.v2.0-Approved-20160823.pdf" deleted by Nestor Peccia/esoc/ESA]
</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">[attachment "IOAG Service Catalog One.v2.0-Approved-20160823withBars.pdf" deleted by Nestor Peccia/esoc/ESA]
</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">CESG will address this update during our next webex.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Main changes are :</span>
<o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">forward / return CFDP file over terrestrial generic file</span>
<o:p></o:p></li></ol>
<ol start="2" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">forward / return packet file service over terrestrial generic file</span>
<o:p></o:p></li></ol>
<ol start="3" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo4">
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Service Management functions</span><o:p></o:p></li></ol>
<p class="MsoNormal"><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">ciao</span> <br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">nestor</span> <o:p>
</o:p></p>
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