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PUBLIC<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Greg,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">I tend to agree with your approach… however, we are limited session control to COP-P, not COP-1… so although this is not an issue for TC, as this is not allowed to be used for the
session control, we are limited its use by AOS…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Is that what we want to do?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Cheers,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Matt.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-US"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-US">Matthew Cosby</span></b><span style="font-size:11.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;mso-ligatures:none;layout-grid-mode:line">Chief Technology Officer
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-US">Goonhilly Earth Station Ltd<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-US"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-ligatures:none"><img width="565" height="141" style="width:5.8833in;height:1.4666in" id="Picture_x0020_1" src="cid:image001.jpg@01DBDE14.3489F450" alt="signature_1318327456"></span><span style="font-size:11.0pt;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none"> SLS-SLP <sls-slp-bounces@mailman.ccsds.org>
<b>On Behalf Of </b>Kazz, Greg (US 312B) via SLS-SLP<br>
<b>Sent:</b> 15 June 2025 03:36<br>
<b>To:</b> Kazz, Greg (US 312B) via SLS-SLP <sls-slp@mailman.ccsds.org><br>
<b>Subject:</b> [Sls-slp] Proposal: Add the CLCW to the Generic Session Control Book 235.1<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt">Dear SLP WG,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">On topic we didn’t address during our Spring ’25 SLP WG meeting this past week at APL, was Tom Gannett’s suggestion, that the TC
<i><span style="color:black">COMMUNICATIONS LINK CONTROL WORD(CLCW) </span></i><span style="color:black">be added as a separate chapter to the Generic Session Control Book, 235.1.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">I would like to get your opinion regarding this additional reorganization step. I will state my opinion below as well.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">This was Tom’s suggestion below:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">[<b>Tom Gannett</b>] Specifically, I would create a new section in the Generic Session Control book, Section 3, Protocol Data Units; move
4.2.1, COMMUNICATIONS LINK CONTROL WORD from TC SDLP to subsection 3.1 in the Session book; and move SUPERVISORY to subsection 3.2 in the Generic Session Control book:</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> </span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">1 INTRODUCTION</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">2 OVERVIEW</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">3 PROTOCOL DATA UNITS</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#EE0000">3.1 COMMUNICATIONS LINK CONTROL WORD</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">3.2 SUPERVISORY PROTOCOL DATA UNIT</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">4 DATA SERVICES OPERATIONS</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">4.1 STATE TABLES</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="text-indent:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> ETC.</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> </span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">I believe this is a clean approach that would make COP services and session control available without the need to invoke the PDU format
specifications in TC SDLP and Proximity-1, but I have not looked at all potential ramifications in all Data Link Layer specs. . . .</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> </span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">All the cross references to CLCW/PLCW/SPDU in the source books would be changed to direct references to the Session book; current references
in the COPs to CLCW/PLCW/SPDU in the source SDLP books would be changed to references to the Session book.
</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> </span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-left:18.0pt"><i><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">TC SLDP would have to be pink sheeted, and any books currently referencing TC SDLP for COP-related stuff would need to updated (via corrigendum
probably).</span></i><i><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">[<b>Greg</b>] This approach that Tom is advocating would make the COP-1 control word generic (CLCW), but would add Telecommand to the Session
book, which currently isn’t used in a generic sense like Prox-1, USLP, and AOS. TC SDLP really should not have the CLCW defined in it, since the TC Frame is the defacto PDU of that document. However, given the high priority to generate the Session Control
book, it seems currently, there is not a big driver to create this separate 3.1 CLCW chapter in the Session book, mainly because Telecommand isn’t envisioned to have session control. So from my point of view, there is no action to be taken here.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">Your thoughts ?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black">Greg<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt;color:black"><o:p> </o:p></span></p>
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