<span style=" font-size:10pt;font-family:sans-serif">Dear colleagues,</span>
<br><span style=" font-size:10pt;font-family:sans-serif"> I hope this
finds you well.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">In liaison with
the SLS-SLP WG chairs, we decided to organise a joint session telco on
30th September with details as below (at 16.00-17.30 CET) regarding the
following two topics:</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif"><i> 1 To
ensure both of our WGs are in sync with respect to the SLE Return Link
Service PIDs are respective WGs have submitted<br>
2. How are Variable Length Frames (VLFs) on the Space to Ground
Link intended to work given the current set of channel codes defined
for them in TM Sync & CC (131.0-B)</i></span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">This meeting is
due to the fact that recently, at CESG pool, the following Blue Books (done
by CSS-CSTS) were sent for publication:</span>
<br><span style=" font-size:10pt;font-family:sans-serif">-911.2 - SLE-RAF</span>
<br><span style=" font-size:10pt;font-family:sans-serif">-911.1 - SLE-RCF</span>
<br><span style=" font-size:10pt;font-family:sans-serif">-911.5- SLE-ROCF</span>
<br><span style=" font-size:10pt;font-family:sans-serif">-912.1 - SLE-
FCLTU</span>
<br><span style=" font-size:10pt;font-family:sans-serif">-912.3 - SLE-FSP</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">The SLS AD identified
that the documents had a number of technical discrepancies, in particular
concerning the adoption of TC channel coding for Space-to-Earth, and variable-length
frames.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">For this reason
the documents were Disapproved, and a cooperation with SLS-SLP and C&S
was recommended. Additionally, PID/RID were sent to the CSS-CSTS.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">In view of the
meeting, you can find in attachment the Blue Books files, while the list
of PID/RID can be found at </span><a href=https://tinyurl.com/crwyuyak><span style=" font-size:10pt;color:blue;font-family:sans-serif">https://tinyurl.com/crwyuyak</span></a><span style=" font-size:10pt;font-family:sans-serif">
</span>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Please feel free
to reach me or Ken in case you need additional clarification</span>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Regards</span>
<br>
<br>
<br><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b>ESA
- European Space Agency</b></span>
<br><span style=" font-size:8pt;color:#00a1e0;font-family:Verdana"><b>Ph.D.
Andrea Modenini</b></span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b><br>
TT&C Communications Systems Engineer</b></span><span style=" font-size:12pt;font-family:Tms Rmn"><b>
</b></span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
TT&C and PDT Systems & Techniques Section (TEC-EST)<br>
RF Systems Division<b><br>
ESTEC</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands</span><span style=" font-size:8pt;color:blue;font-family:Verdana"><u><br>
</u></span><span style=" font-size:8pt;color:#808080;font-family:Verdana">andrea.modenini@esa.int
| </span><a href=http://www.esa.int/><span style=" font-size:8pt;color:#8f8f8f;font-family:Verdana"><u>www.esa.int</u></span></a><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
T +31 71 56 53439, M +31 6 484 56 527</span>
<br><span style=" font-size:9pt;color:#800080;font-family:sans-serif">-----
Forwarded by Andrea Modenini/estec/ESA on 15-09-21 09:49 -----</span>
<br>
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<td style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><span style=" font-size:12pt;font-family:Default MultiLingual"><b>Joint
CCSDS C&S and SLP WG telecon</b></span>
<br>
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<td style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><span style=" font-size:10pt;font-family:Default MultiLingual"><b>Thu
30-09-2021</b> 16:00 - 17:30</span>
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<td width=100% style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><span style=" font-size:9pt;font-family:Default MultiLingual">Attendance
isfor</span><span style=" font-size:10pt;font-family:Default MultiLingual">
</span><span style=" font-size:9pt;font-family:Default MultiLingual">Andrea
Modenini</span></table>
<br>
<br>
<br>
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<td style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><span style=" font-size:9pt;font-family:Default MultiLingual">sls-slp@mailman.ccsds.org,
sls-cc@mailman.ccsds.org</span>
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<td width=100% style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><span style=" font-size:10pt;font-family:sans-serif">Meeting:
Joint CCSDS C&S WG and SLP WG Telecon in preparation for the Fall
CCSDS Meetings in October 2021<br>
<br>
Topics:<br>
<br>
1. To ensure both of our WGs are in sync with respect to the
SLE Return Link Service PIDs are respective WGs have submitted<br>
2. How are Variable Length Frames (VLFs) on the Space to Ground
Link intended to work given the current set of channel codes defined
for them in TM Sync & CC (131.0-B)<br>
<br>
Background:<br>
<br>
Several of us are participating in the review of the followingl SLE blue
books (SLE RAF, SLE RCF, SLE ROCF, SLE FCLTU, SLE FSP). We have found several
discrepancies in these documents and want to ensure that our WGs are on
the same page with respect to our inputs to the CSTS WG.<br>
<br>
A separate issue which seems to be mixed into the review of these return
SLE documents is the issue of the appropriate use of variable length frames
(VLFs) on the return link. The SLP WG asserts that the TM Sync &
CC blue book Chapter 8 (LDPC Slicing) already provides the option to slice
fixed or variable length transfer frames on the space to ground link. Perhaps
it would make sense to explicitly state that both fixed and variable length
USLP frames are supported by this approach in that 131.0 document. We believe
currently the text in Chapter 8 implies this is a true statement for variable
length frames as well. We would like to discuss the options available with
the C&S WG.<br>
<br>
Also note that on the Proximity link, variable length prox-1 transfer frames
are currently being sliced on the return proximity link per the Prox-1
C&S blue book (211.2).<br>
<br>
Best regards,<br>
<br>
Greg Kazz & Matt Cosby<br>
CCSDS SLS WG<br>
<br>
<br>
<br>
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