[SLS-CC] [EXTERNAL] Re: VCM technical corrigendum wording (AI_21_01)

Wed Jul 7 23:03:50 UTC 2021

Thanks, Andrea. I am fine with the proposed additional wording in the 
VCM technical corrigendum, especially if it conforms with new wording in 
the SCCC and DVB-S2 books. I would have preferred updating the figure 
that shows the layers, but I understand that proposal was not agreed to 
at the meeting this morning.

      ----Jon

*Jon Hamkins*
Chief Technologist, Communications, Tracking, and Radar Division

*JPL*   |   jpl.nasa.gov
On 7/7/2021 9:22 AM, Andrea Modenini (external) wrote:
> Dear all,
>  I did not receive any comment about the VCM BB from the WG.
>
> However, considering the outcome of the DVB-S2 BB review we had today, 
> I have myself a comment.
> We aligned the SCCC and DVB-S2 BBs for having a sentence that  states 
> the need to consider CCSDS 401 BB.
> On the same line, I would propose to modify Section 2 as provided 
> below (italic part highlights the addition).
>
> You can find in attachment also the word file in tracking-changes mode 
> for your convenience.
>
> Please let me know if there is any objection, or additional point to 
> consider, _no later than 12th July EOB_.
> I will afterward request an Area Resolution for having the technical 
> corrigendum.
>
> Kind Regards,
> Andrea
>
>
>
>
> -------------
> This Recommended Standard covers functions in both the Synchronization 
> and Channel Coding Sublayer and the Physical Layer/, the latter for 
> what concerns the modulation schemes. CCSDS 401.0-B [5] covers 
> additional features of the Physical Layer like frequency bands, 
> polarizations, etc. that are not described or referenced here./
>
>
> *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 | _www.esa.int_ 
> <https://urldefense.us/v3/__http://www.esa.int/__;!!PvBDto6Hs4WbVuu7!av8cZaByxWDZLHhI--ea5KCdB1GbEgqU1p3aRmgCnWaI-c1Va7boHYrX4I3Dqd5X4rFHho4$>
> T +31 71 56 53439
>
>
>
> From: Andrea Modenini/estec/ESA
> To: "Space Link Coding & Synchronization Working Group" 
> <sls-cc at mailman.ccsds.org>
> Date: 10-06-21 17:28
> Subject: [SLS-CC] VCM technical corrigendum wording (AI_21_01)
> ------------------------------------------------------------------------
>
>
> Dear colleagues,
>
> please find enclosed the proposed changes by Jon to the VCM BB 
> discussed during the joint C&S/RFM meeting. Please send your comments 
> before *1st July 2021*  (if any) directly to John with CC Enrico and 
> I, and C&S mailing list.
>
>
> Regards
> Andrea
>
>
> *HE Space Operations for ESA - European Space Agency*
> *Ph.D. Andrea Modenini**
> Communication Systems & Technologies Engineer***
> TT&C and PDT Systems & Techniques Section (TEC-EST)
> RF Systems Division*
> ESTEC*
> Keplerlaan 1, PO Box 299
> NL-2200 AG Noordwijk, The Netherlands_
> _andrea.modenini at esa.int | _www.esa.int_ 
> <https://urldefense.us/v3/__http://www.esa.int/__;!!PvBDto6Hs4WbVuu7!av8cZaByxWDZLHhI--ea5KCdB1GbEgqU1p3aRmgCnWaI-c1Va7boHYrX4I3Dqd5X4rFHho4$>
> T +31 71 56 53439
> ----- Forwarded by Andrea Modenini/estec/ESA on 10-06-21 17:25 -----
>
> From: "Jon Hamkins" <Jon.Hamkins at jpl.caltech.edu>
> To: "Andrea Modenini (external)" <Andrea.Modenini at esa.int>, 
> "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>
> Date: 09-06-21 18:48
> Subject: VCM technical corrigendum wording (AI_21_01)
> ------------------------------------------------------------------------
>
>
>
> Andrea, Enrico,
> Attached is a draft VCM technical corrigendum in response to AI_21_01 
> from the C&S WG. I completed this in consultation with Ken Andrews and 
> John Pietras.
> The main changes are in two places: Section 3.2.3 and Section 3.3.2.3 
> to 3.3.2.4. In summary, with the new wording the randomization is 
> determined by VCM type:
>
>   * Type 1 (SCCC-like) VCM will randomize the Transfer Frames as the
>     SCCC standard does, using the TM randomizer.
>   * Type 2 (DVB-S2-like) VCM will randomize the sliced encoder-inputs
>     as the DVB-S2 standard does, using the ETSI DVB-S2 baseband scrambler.
>
> This will make the CCSDS VCM standard consistent with the 131.2-B-1 
> and 131.3-B-1 books (SCCC and DVB-S2), with respect to randomization.
> These changes are not related to randomization that occurs after 
> encoding. The VCM protocol standard already applies post-encoding 
> randomization, at the physical layer.
> Can you forward this message to the RFM and C&S mailing lists along 
> with your guidance on how/when to respond with comments? I believe we 
> agreed to resolve this action by email.
>      ----Jon
> -- *
> Jon Hamkins*
> Chief Technologist, Communications, Tracking, and Radar Division*
> O* 818-354-4764 (preferred)   | *M* 626-658-6220 (does not work at home)
> *
> JPL*   |   jpl.nasa.gov [attachment 
> "2021-05-27-VCM-431.1-technical-corrigendum-post-discussion-v3.doc" 
> deleted by Andrea Modenini/estec/ESA]
>
>
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