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

[Andrea Modenini (external)]

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
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 

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