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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dear Gian Paolo.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It’s obvious that I’m due for my annual vision test
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">! I read that line several times and somehow overlooked the “TC (reference [2])”. I am truly embarrassed.<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">Thank you for your quick response. And to the rest of you, my apologies for wasting your time with my error.<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"> Gian.Paolo.Calzolari@esa.int [mailto:Gian.Paolo.Calzolari@esa.int]
<br>
<b>Sent:</b> Friday, October 23, 2020 12:41 PM<br>
<b>To:</b> John Pietras <john.pietras@gst.com><br>
<b>Cc:</b> sls-slp@mailman.ccsds.org<br>
<b>Subject:</b> Re: [Sls-slp] Encapsulation packets over TC VC Packet service?<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 John,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif"> I think that Virtual Channel Packet service of TC (section 3.4 of CCSDS 232.0-B-3) is actually mentioned under the bullet "a" you report below.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">That bullet intends to refer to VCP Service that - mutatis mutandis - is actually provided by 3 books:</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">TM (reference [1]),
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">TC (reference [2]),</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">AOS (reference [3]),
</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Am I overlooking something?</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Regards</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Gian Paolo</span> <br>
<br>
<br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"John Pietras" <<a href="mailto:john.pietras@gst.com">john.pietras@gst.com</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"<a href="mailto:sls-slp@mailman.ccsds.org">sls-slp@mailman.ccsds.org</a>" <<a href="mailto:sls-slp@mailman.ccsds.org">sls-slp@mailman.ccsds.org</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">23-10-20 17:27</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">[Sls-slp] Encapsulation packets over TC VC Packet service?</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"SLS-SLP" <<a href="mailto:sls-slp-bounces@mailman.ccsds.org">sls-slp-bounces@mailman.ccsds.org</a>></span>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">SLS-SLP colleagues ---</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">Section 3.2.2.2 of the
<i>Encapsulation Packet Protocol</i> Blue Book (CCSDS 133.1-B-3) specifies the content of the SDLP_Channel for the various underlying space data link protocols (SDLPs):</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">“a) for the Virtual Channel Packet (VCP) service of TM (reference [1]), TC (reference [2]),<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">or AOS (reference [3]), SDLP_Channel shall contain the Global Virtual Channel<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Identifier (GVCID);<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">b) for the MAP Packet (MAPP) service of TC (reference [2]) and USLP (reference [5]),<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">SDLP_Channel shall contain the Global MAP ID (GMAP ID);<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">c) for the Packet Service of Proximity-1 (reference [4]), SDLP_Channel shall contain the<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Transfer Frame Version Number, the Spacecraft Identifier (SCID), the Physical<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Channel Identifier (PCID), the Data Field Construction ID (DFC_ID), and the Port ID.”<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">Missing from this list is any mention of the
<u>Virtual Channel Packet service of TC</u> (section 3.4 of CCSDS 232.0-B-3. Was this exclusion accidental or intentional – i.e., is Encapsulation over the TC VC Packet service disallowed? I suggest that the issue be resolved unambiguously one way or the other
– that is, either add it to the list of SDLP_Channels that contain GVCIDs or add a note that explicitly rules out in that usage.</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">Thanks.</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">Best regards,</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-family:"Calibri",sans-serif">John</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><tt><span style="font-size:10.0pt">_______________________________________________</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
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