[Sls-slp] LFSR OID frame RIDs affecting USLP, TM, AOS SDLPs

Gian.Paolo.Calzolari at esa.int Gian.Paolo.Calzolari at esa.int
Fri May 21 17:49:06 UTC 2021

Victor, if you want to push in this direction, the decision shall be agreed with the other two WGs that make much wider use of those diagrams.
Gian Paolo

Sent from my iPhone

> On 21. May 2021, at 17:57, Sank, Victor J.(GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via SLS-SLP <sls-slp at mailman.ccsds.org> wrote:
> In order to make some attempt to standardize the LFSRs and their associated polynomial  in CCSDS, I would suggest that we use a standard for cell labeling that makes a simple association with the polynomial as in MatLab.  If you don’t like the MatLab convention, pick something and lets make it a standard for the NASA documents.  Eventually maybe we can get CCSDS to accept the standard.  
>               They are a standards organization aren’t they?
> Victor
> From: Kazz, Greg J (US 312B) <greg.j.kazz at jpl.nasa.gov> 
> Sent: Friday, May 21, 2021 11:31 AM
> To: Andrews, Kenneth S (JPL-332B)[JPL Employee] <kenneth.s.andrews at jpl.nasa.gov>
> Cc: Sank, Victor J. (GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] <victor.j.sank at nasa.gov>; Kazz, Greg J (US 312B) via SLS-SLP <sls-slp at mailman.ccsds.org>; Andrea Modenini (external) <Andrea.Modenini at esa.int>
> Subject: LFSR OID frame RIDs affecting USLP, TM, AOS SDLPs
> Hi Ken,
> The SLP WG decided to put both of your diagrams into a new non-normative annex in USLP, TM, and AOS.
> The text in the normative part of the link layer books will state:
> The TFDZ of an OID Transfer Frame shall be generated by use of a 32-cell Linear Feedback Shift Register (LFSR) with polynomial 1 + D + D2 + D22 +D32, see Annex X.
> Where Annex X is TBD and will be added by me to the document.
> We have some questions and requests for you:
> Why does the initialization data differ from one figure to the other one? 
> The ‘1’ in the figures are misleading to some WG members, please replace ‘1’ with D sub zero i.e., D0 in the figures.
> Consensus of WG was to specify the initialization vector in both of the diagrams
> New Info:
> Do you concur with these changes ?
> If so, the SLP WG will wait for your modifications to those diagrams and thereafter I will insert them into the AOS, USLP, and TM pink sheets.
> When might we receive them ?
> Best regards,
> Greg
> Greg Kazz
> Principal Engineer
> Technical Group Supervisor,
> 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

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