[Css-csts] FW: Proposed Changes to USLP (CCSDS 732.1-B) FECF and related sections

[John Pietras]

CSTSWG colleagues ---
Here is Greg Kazz’s email, which contains a link to the proposed changes regarding the dropping of the 32-bit FECF field from the USLP frame. This change affects the specification of the flfUslpMcMuxFrameErrorContrPresence parameter of the FlfUslpMcMux FR.

Best regards,
John

From: SLS-SLP [mailto:sls-slp-bounces at mailman.ccsds.org] On Behalf Of Kazz, Greg J (US 312B) via SLS-SLP
Sent: Thursday, September 10, 2020 1:50 PM
To: Kazz, Greg J (US 312B) via SLS-SLP <sls-slp at mailman.ccsds.org>; Massimo.Bertinelli at esa.int; Andrews, Kenneth S (US 332B) <kenneth.s.andrews at jpl.nasa.gov>
Subject: [Sls-slp] Proposed Changes to USLP (CCSDS 732.1-B) FECF and related sections

Dear SLP WG,

Due to some issues that Ken Andrews and Massimo Bertinelli from the C&S WG have brought to my attention regarding the application of the CRC-32 in USLP with respect to the C&S sublayer coding recommendations, I have generated with the help of Gian Paolo some proposed changes to the 732.1-B (USLP) Blue book related to the Frame Error Control Field (FECF). The idea behind these changes is to simply the interface between the C&S sublayer and the Protocol Sublayer. In essence, USLP would only supply the CRC-16 for the FECF. The CRC-32 would only be supplied by the C&S sublayer when CCSDS 211.2 (Prox-1 Sync & CC) applies.

These proposed changes are in the SLP WG CWE under:

https://tinyurl.com/yxc6s7xr

Please let me know if you have any comments on these changes. My intent is to bring these changes up for discussion at the Virtual CCSDS Fall meetings in late October in the SLP WG meetings. I would like to receive your comments by Sept 24.

Best regards,
Greg

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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