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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Nestor,<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 had a chat with Wallace today, and my understanding is that the action item, although somewhat awkwardly phrased, is really the CMC just asking to limit the
scope of forward and return file to be simply an injection into and extraction from CFDP. This was already understood to be one of the use cases so that is okay. I’m also okay considering a smaller scoped activity as that will, of course, mean less resource
commitment, less to develop and potentially prototype (it seems like something like this would probably need to be prototyped – but that is not really for discussion here).
<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">Do you agree with this? If so, I think we can close the action as agreeing to limit the scope to interfacing with CFDP.
<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Erik<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>
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<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"> Barkley, Erik J (3970)
<br>
<b>Sent:</b> Tuesday, June 02, 2015 3:47 PM<br>
<b>To:</b> Nestor.Peccia@esa.int; Tai, Wallace S<br>
<b>Cc:</b> Margherita.di.Giulio@esa.int; CESG -- CCSDS-Engineering Steering Group (cesg@mailman.ccsds.org) (cesg@mailman.ccsds.org)<br>
<b>Subject:</b> Follow up re CMC-A-2015-05-04<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Nestor, Wallace,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For your convenience here is what the action states: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">CMC-A-2015-05-04</span> <o:p>
</o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">The Cross Support Services Area was requested to consider using Terrestrial Generic File Transfer Service along with the CFDP File Structure to replace the following two standards: CSTS Forward File Service
(CFFS) and CSTS Return File Service (CRFS).</span> <br>
<span style="font-size:10.0pt">Action: Cross Support Services Area</span> <br>
<span style="font-size:10.0pt">Due Date: 30 June 2015</span> <br>
<span style="font-size:10.0pt">Status: Open</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Summary response</span></i></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I do not understand what is being asked to be considered here. I believe the CSS Area is properly investigating the use cases indicated by the IOAG service catalog definition.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">More detailed discussion follows. Your inputs on helping to clarify what this action is asking for will be appreciated.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-Erik<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">---More detailed discussion for forward side---<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">For reference, here is what the IOAG service catalog, June 2013 version, has to say about forward file service. I have added some comments in
<span style="color:red">red</span>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">FORWARD FILE SERVICE TYPE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This Service enables a mission to send the contents of a file to a spacecraft by allowing a Control<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Center to provide a Ground Tracking Asset with files for uplink.
<span style="color:red">[NOTE: this states the contents of the file to be sent to the mission spacecraft, not the file; what is being provided from the mission to the control center is the file]
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Within Catalog #1, usage of this service is limited to a spacecraft directly reachable from a Ground Tracking Asset (i.e. single hop<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">space link) as per Figure 2-1. It relies on the same Space Link Interface Standards applicable to<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">“Forward CLTU Service” (see 4.1.1) and/or “Forward Synchronous Encoded Frame Service” (see<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">4.1.3) plus the following Space Link Interface Standards and Ground Link Interface Standards.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• Space Packet Protocol [SPP]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• Encapsulation Service [ENC]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CCSDS File Delivery Protocol [CFDP]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CSTS Forward File Service [CFFS] over<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CSTS Transfer File Service [CFXS]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• TM Synchronization and Channel Coding [TM-S&C]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• AOS Space Data Link Protocol [AOS]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Remark - The two CSTS File Services listed above are “to be written”. It is assumed that a generic<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">transfer file service allowing to transfer files between two units, i.e. [CFXS], will be available and<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- on top of this generic service – more “specialized” file services will allow requesting the<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">dedicated processing for the file being transferred. Therefore, it is expected that the CSTS Forward<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">File Service will allow the Control Center to inform whether the file contains<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a collection of Space Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a collection of Encapsulation Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a file to be processed into CFDP PDUS to be embedded either in Space Packets or<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Encapsulation Packets.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Additionally the CSTS Forward File Service will allow the Control Center to state how the<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Space/Encapsulation Packets shall be forwarded to the spacecraft either within TC Frames or AOS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Frames.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">These statements:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">“…Therefore, it is expected that the CSTS Forward<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">File Service will allow the Control Center to inform whether the file contains<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:red"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">a collection of Space Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:red"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">a collection of Encapsulation Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:red"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">a file to be processed into CFDP PDUS to be embedded either in Space Packets or<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Encapsulation Packets.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Additionally the CSTS Forward File Service will allow the Control Center to state how the<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Space/Encapsulation Packets shall be forwarded to the spacecraft either within TC Frames or AOS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Frames.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Strongly suggest to me that we are to consider that the file coming from the mission to the ground station control center may contain various space link artifacts,
in a file, and that the file is to either be unpacked and properly placed on the spacelink or to be an injected into CFDP instance that is terminated at the ground station (and subsequently uplinked as CFDP). Based on that I believe the CSS area is properly
investigating the set of use cases for a potential forward file service. Its unclear to me how considering CFDP file structure to eliminate the forward services envisioned (as I understand it) in the IOAG catalog really does anything to eliminate the use
cases identified here. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">---More detailed discussion for return side---<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From June 2013 IOAG Svc Cat 1:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">RETURN FILE SERVICE TYPE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This Service enables a mission to send the contents of a file to a Control Center by allowing a
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Ground Tracking Asset to provide a Control Center with files received from a spacecraft.
<span style="color:red">[Note that this is again is the contents of a file (not a file) on the spacelink, with the file itself being on the ground; in this case just running in the opposite direction as forward side]
</span>Within<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Catalog #1, usage of this service is limited to a spacecraft directly reachable from a Ground<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Tracking Asset (i.e. single hop space link) as per Figure 2-1. It relies on the same Space Link<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Interface Standards applicable to “Return Channel Frames Service” (See 4.2.2) plus the following<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Space Link Interface Standards and Ground Link Interface Standards.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• Space Packet Protocol [SPP]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• Encapsulation Service [ENC]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CCSDS File Delivery Protocol [CFDP]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CSTS Return File Service [CRFS] over<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">• CSTS Transfer File Service [CFXS]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Remark - The two CSTS File Services listed above are “to be written”. It is assumed that a generic<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">transfer file service allowing to transfer files between two units, i.e. [CFXS], will be available and<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- on top of this generic service – more “specialized” file services will allow requesting the<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">dedicated processing for the file being transferred. Therefore, it is expected that the CSTS Return<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">File Service will allow the Ground Tracking Asset to inform the Control Center whether the file<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">contains<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a collection of Space Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a collection of Encapsulation Packets, or<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">a file reconstructed from CFDP PDUS that were embedded either in Space Packets or<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Encapsulation Packets. 8<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Additionally the CSTS Return File Service will allow the Ground Tracking Asset to report whether<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">the Space/Encapsulation Packets were transmitted from the spacecraft either within TM Frames or<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">AOS Frames.9<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">This seems very much to me to be the mirror image of the forward side; in this case, spacelink artifacts are being gathered up for delivery as a file or being gathered
up for what can be inferred as ground domain CFDP only. </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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