[SLS-CC] CCSDS 230.1-G-2.1 - Green Book TC - approved with comments - please check deadline

Fri Sep 3 04:51:48 UTC 2021

Andrea,

Finally, an updated version of the TC Green Book is attached, in both .docx and .pdf formats (showing change tracking).  The only change from the prior version, dated July 8, is that I reverted the modifications that were intended to address point 2.  This means that Section 10.1 now reads the same as it did prior to the CESG poll, and I deleted references [8] and [9] again (which were cited in Section 10.1 as references for CFDP and LTP).  As for change tracking, I took the time to accept each change that was caused by Microsoft’s automatic renumbering.  The result (I hope) is that the change tracking now shows all human-made edits since the CESG poll, in a readable way.

I believe this completes our action with respect to the “Approve with Conditions” result from the CESG poll for publication, and these changes can now go back to Tom Gannett for one more update.  After that, I don’t know if the CCSDS procedure is to get Peter Shames’s concurrence (as the CESG member who imposed these conditions), or to repeat the full CESG poll, or whether it can now proceed to the CMC poll for publication.

-Ken

On Aug 19, 2021, at 6:46 AM, Andrea Modenini (external) <Andrea.Modenini at esa.int<mailto:Andrea.Modenini at esa.int>> wrote:

Dear Ken,
 following the comments we received, I believe we had WG consensus. All points are accepted, except 2).

If you could please provide us an updated draft accordingly and then we can ask for a SLS AD resolution.
I guess it is sufficient to reject the edit in Section 10.1, but please let me know.

Thanks in advance,
Kind Regards

HE Space Operations for ESA - European Space Agency
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
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From:        Andrea Modenini/estec/ESA
To:        "Space Link Coding & Synchronization Working Group" <sls-cc at mailman.ccsds.org<mailto:sls-cc at mailman.ccsds.org>>
Date:        28-07-21 16:01
Subject:        [SLS-CC] CCSDS 230.1-G-2.1 - Green Book TC - approved with comments - please check deadline
________________________________

Dear colleagues,
 with reference to the Green Book of the TC, at CESG pool, we got an approval with conditions from SEA AD, with the feedback below.
Following discussion with the SLS AD and DAD, it was decided to re-iterate such conditions at WG level.

Kindly, Ken already took action to provide a draft of the TC Green Book implementing such edits (see attachment).

I myself reviewed the comments:
-Point 3, 4, and 5, look normal editorials.
-point 1) is about including USLP. This appear in line with the Blue Book review that we had recently
-point 2) implies instead the introduction of CFDP and LTP for TC. Personally I am not aware that we had any discussion/input in the WG for allowing the use of such protocols for TC, nor I see any content in the BlueBook.
If this is the case, my personal opinion would be to discard this last point.

Starting from this, could you please assess my conclusions and let me know any disagreement no later than 13rd August EOB?

In case deadline does not fit because of planned vacation, please also let me know that I will consider an extension.

Kind Regards

----

It's great that this doc is now being updated, given all of the changes in the C&S WG and other SLS standards.  I identify the following Issues:

1) There is no mention of USLP, expecially in the variable length frame mode.  Only TC is included.  This must be fixed.  Too many sections to list.

2) In sec 10.3.3.1 (and 10.3.3.4) the only option described for handling "long wait times" on deep space links is the repeat function.  However, equally viable methods are to use CFDP of even LTP to provide automated file or link layer reliability.  These should be addressed.

3) The term "CODEWORD", "Codeword", and "codeword" are all used, sometimes in the same sentence.  They look different but apparently mean the same thing.  Provide some description of this early in the doc to avoid any possible confusion.  Too many sections to list.

4) In Glossary "codeword" is not really defined, just a reference is provided.  Fix this.  Also, both encoding and decoding definitions only mention BCH, not LDPC.  Please fix this throughout.

5) There are many new scholarly references, which is fine.  At least one, [27], appears to have no reference identified in the body of the text.  Please fix this.

HE Space Operations for ESA - European Space Agency
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
andrea.modenini at esa.int<mailto:andrea.modenini at esa.int> | www.esa.int<https://urldefense.us/v3/__http://www.esa.int/__;!!PvBDto6Hs4WbVuu7!cIc9E32LLHyMjJ-uo1Oqz86iETs6la0_4ahaNg3YU-oMMPxxVlmDEmHkS2d8i13z_KZP4EpP$>
T +31 71 56 53439, M +31 6 484 56 527

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