<span style=" font-size:10pt;font-family:sans-serif">Dear John,</span>
<br><span style=" font-size:10pt;font-family: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:10pt;font-family: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:10pt;font-family:sans-serif">TM (reference
[1]), </span>
<br><span style=" font-size:10pt;font-family:sans-serif">TC (reference
[2]),</span>
<br><span style=" font-size:10pt;font-family:sans-serif">AOS (reference
[3]), </span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Am I overlooking
something?</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Regards</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Gian Paolo</span>
<br>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"John
Pietras" <john.pietras@gst.com></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"sls-slp@mailman.ccsds.org"
<sls-slp@mailman.ccsds.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">23-10-20
17:27</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">[Sls-slp]
Encapsulation packets over TC VC Packet service?</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">"SLS-SLP"
<sls-slp-bounces@mailman.ccsds.org></span>
<br>
<hr noshade>
<br>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">SLS-SLP
colleagues ---</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">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></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">“a)
for the Virtual Channel Packet (VCP) service of TM
(reference [1]), TC (reference [2]),</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">or
AOS (reference [3]), SDLP_Channel shall contain the Global Virtual Channel</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">Identifier
(GVCID);</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">b)
for the MAP Packet (MAPP) service of TC (reference
[2]) and USLP (reference [5]),</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">SDLP_Channel
shall contain the Global MAP ID (GMAP ID);</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">c)
for the Packet Service of Proximity-1 (reference
[4]), SDLP_Channel shall contain the</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">Transfer
Frame Version Number, the Spacecraft Identifier (SCID), the Physical</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt">Channel
Identifier (PCID), the Data Field Construction ID (DFC_ID), and the Port
ID.”</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">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></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">Thanks.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">Best
regards,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:12pt;font-family:Calibri">John</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span><tt><span style=" font-size:10pt">_______________________________________________<br>
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