[Sls-slp] Draft Modification to USLP if VLFs defined in 131.0 (TM sync & cc) etc are allowed

[Moury Gilles]

Dear Greg,
OK with the modifications you propose for allowing USLP variable length frames to work with 131.0, 131.2, 131.3. This will requires modifications in those 3 channel coding books to specify clearly the 2 input modes:

·       Fixed length frames

·       Variable length frames

Slicing might not be the best term to distinguish between the 2 modes since, for example, 131.2 uses the Generic Stream (GS) mode of DVB-S2 which implies slicing of the input stream in all cases : whether it is a stream of fixed length frames or a stream of variable frame length.

Best regards,
Gilles

Gilles MOURY
CNES Toulouse
De : SLS-SLP <sls-slp-bounces at mailman.ccsds.org> De la part de Kazz, Greg J (US 312B) via SLS-SLP
Envoyé : mardi 26 octobre 2021 19:13
À : Kazz, Greg J (US 312B) via SLS-SLP <sls-slp at mailman.ccsds.org>
Objet : [Sls-slp] Draft Modification to USLP if VLFs defined in 131.0 (TM sync & cc) etc are allowed

Dear SLP WG,

Please review my 4 modifications to the USLP BB (searchable in Word, when you use the term “Modified by GK”, that will bring you to them), if 131.0 (TM Sync & CC), 131.2 (SCCC), and 131.3 (DVBS-2) are modified to include Variable Length Frames (VLFs) when the data stream is sliced.

I clarified the two cases:

  1.  the use case for fixed length frames without slicing the data stream
  2.  the use case for variable length frames including slicing the data stream

Currently in the USLP BB online, we exclusively consider USLP limited to fixed length frames (FLF) whenever 131.0 (TM Sync & CC), 131.2 (SCCC), and 131.3 (DVBS-2) are in use.

The URL of that document (with Oct 26 in the filename) is:

https://cwe.ccsds.org/sls/docs/Forms/AllItems.aspx?RootFolder=%2Fsls%2Fdocs%2FSLS%2DSLP%2FMeeting%20Materials%2F2021%2FFall%2FUSLP%20Blue%20Book&FolderCTID=0x012000439B56FF51847E41B5728F9730D7B55F&View=%7BAE8FB44C%2DE80A%2D42CF%2D8558%2DFB495ABB675F%7D

Of course, the final text will be dependent upon your review as well as the actual changes to 131.0, 131.2, and 131.3 by the C&S WG.

I’m particularly keen on hearing back from the C&S WG members on this thread as well.

Thanks much,
Greg
SLP WG Chair

Greg Kazz
Principal Engineer
Technical Group Supervisor,
PSSE/EEISE/PPSE (312B)
Jet Propulsion Laboratory
4800 Oak Grove Dr., M/S 301-490
Pasadena, CA 91109
1+(818)393 6529(voice)
1+(818)393 6871(fax)
email: greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>

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