[Sls-slp] OID Frames with mandatory PN sequence: Unfinished Business

Wed Jan 27 08:32:49 UTC 2021

Dear Greg,

as RFM WG chair I appreciate your effort and support this process.

Best Regards, Enrico

From:   "Kazz, Greg J\(US 312B\) via SLS-SLP" <sls-slp at mailman.ccsds.org>
To:     "Kazz, Greg J  via SLS-SLP  (US 312B)" <sls-slp at mailman.ccsds.org>
Cc:     "Thomas Gannett" <thomas.gannett at tgannett.net>
Date:   26/01/21 18:57
Subject:        [Sls-slp] OID Frames with mandatory PN sequence: 
Unfinished Business
Sent by:        "SLS-SLP" <sls-slp-bounces at mailman.ccsds.org>

[attachment "SLS_RFM_19_21_new2.pptx" deleted by Enrico Vassallo/esoc/ESA] 

Dear SLP WG members,

Happy New Year ! We all hope it will be a better one than the last one.

I’ve now updated all the affected SDLP’s (TM, AOS, USLP) with the agreed 
to mandatory PN sequence generator to be used in generating the random 
data pattern within the transfer frame data field of OID frames.
Luckily the changes has not impacted these books very much and is rather 
easily accommodated.
Please go to the following URL on the CWE that contain the 3 new files 
(each one containing the final prefix _gk):
https://tinyurl.com/yxn7gecs

This change affects the following sections in these SDLP books:
Section 4.1.4.6 which is now split into separate requirements to 
accommodate the mandatory PN sequence generator.
The note directly below associated with the project providing the idle 
pattern, has now been changed to provide the motivation for the random PN 
sequence.
Finally, in each book, the acronym, LFSR (Linear Feedback Shift Register) 
has been added to the Acronym Annex in the back.

I have included the power point presentations supplied by Massimo 
Bertinelli as a reminder of the changes proposed by RF&M and C&S WGs back 
in Dec 2019, which SLP WG concurred upon. We are simply catching up on 
that action now.

So given the short fuse associated with providing these documents for 
Agency Review, I request you review these changes and provide me with your 
feedback by Thursday, Jan 28.

Best regards,
Greg Kazz – Chair SLP WG

From: "Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>
Date: Tuesday, January 26, 2021 at 7:41 AM
To: "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov>
Cc: "Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>, 
"Gilles.Moury at cnes.fr" <Gilles.Moury at cnes.fr>, Matthew Cosby 
<matt.cosby at goonhilly.org>
Subject: Re: OID Frames with mandatory PN sequence: FW: [EXTERNAL] Re: 
[Sls-slp] [SLS-CC] Joint C&S/SLP

Hi Greg, 

the 32-cell LFSR agreed upon was presented in the document attached (slide 
12-13). 
In the document the initialisation of the register was an open question (3 
options given). 
In the end, one option was chosen as outlined in the C&S-SPL  liaison 
presentation attached. 
I hope this can help. 
Please let me know in case you need more information. 

Best regards, 
Massimo 

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
-------------------------------------------------- 

From:        "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov> 
To:        "Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>, 
"Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int> 
Cc:        "Gilles.Moury at cnes.fr" <Gilles.Moury at cnes.fr>, "Matthew Cosby" 
<matt.cosby at goonhilly.org> 
Date:        25/01/2021 22:56 
Subject:        Re: OID Frames with mandatory PN sequence: FW: [EXTERNAL] 
Re: [Sls-slp] [SLS-CC] Joint C&S/SLP 

OK. So it sounds like I need to add the same requirement into 3 SDLP books 
(TM, AOS, USLP)…something to the effect that the frame data field contents 
of OID transfer frames shall be generated by the use of the mandatory PN 
sequence by means of the 32-cell LFSR. 

Question – Can someone send me the specification (and the viewgraph 
presentation) for this PN sequence generator (32-cell LFSR), so that I can 
reference it in those documents?

Thanks!
Greg

From: "Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>
Date: Monday, January 25, 2021 at 12:58 PM
To: "Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>
Cc: "Gilles.Moury at cnes.fr" <Gilles.Moury at cnes.fr>, "Kazz, Greg J (US 
312B)" <greg.j.kazz at jpl.nasa.gov>, Matthew Cosby 
<matt.cosby at goonhilly.org>
Subject: Re: OID Frames with mandatory PN sequence: FW: [EXTERNAL] Re: 
[Sls-slp] [SLS-CC] Joint C&S/SLP

no change foreseen or needed in the coding book...we'll eventually 
introduce a longer randomiser, but the OID pattern is indipendent. 
The C&S books simply refer to the protocol books for the pattern 

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
-------------------------------------------------- 

From:        Gian Paolo Calzolari/esoc/ESA 
To:        "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov> 
Cc:        "Matthew Cosby" <matt.cosby at goonhilly.org>, Massimo 
Bertinelli/estec/ESA at ESA, Gilles.Moury at cnes.fr 
Date:        25/01/2021 17:34 
Subject:        Re: OID Frames with mandatory PN sequence: FW: [EXTERNAL] 
Re: [Sls-slp] [SLS-CC] Joint C&S/SLP 

Greg, 
I am not sure there will be any pink sheets to coding book. 
Up to Massimo to confirm. 
Ciao 

Gian Paolo

Sent from my iPhone 

On 25. Jan 2021, at 17:19, Kazz, Greg J (US 312B) 
<greg.j.kazz at jpl.nasa.gov> wrote:
Gian Paolo,

This new requirement on making the use of the PN sequence mandatory for 
OID frames is not in any of the SDLP books yet.
If you can email me the relevant pink sheets to the coding books regarding 
this new requirement, then I can generate the additional pink sheet 
changes to TM, AOS, and USLP SDLPs. Thereafter I will need to send them 
out to the SLP WG for a quick review.

Regards,
Greg

From: "Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>
Date: Monday, January 25, 2021 at 7:39 AM
To: "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov>
Cc: Matthew Cosby <Matt.Cosby at Goonhilly.org>, "Massimo.Bertinelli at esa.int" 
<Massimo.Bertinelli at esa.int>, "Gilles.Moury at cnes.fr" 
<Gilles.Moury at cnes.fr>
Subject: OID Frames with mandatory PN sequence: FW: [EXTERNAL] Re: 
[Sls-slp] [SLS-CC] Joint C&S/SLP

Greg, 
      is this already in any of the Space Data Link Protocols books? 
If not & needed, any chance to update the books before starting the 
CESG/CMC Polls for Agency Review? 

Thanks 

Gian Paolo 

From:        Massimo Bertinelli/estec/ESA 
To:        "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov> 
Cc:        "Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>, 
"Matthew Cosby" <Matt.Cosby at Goonhilly.org> 
Date:        23-01-21 21:58 
Subject:        Re: FW: [EXTERNAL] Re: [Sls-slp] [SLS-CC] Joint C&S/SLP 

That's good news, thank you. 
Sorry for losing track on this point, I should have kept better notes. 

Best regards, 
Massimo 

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
-------------------------------------------------- 

From:        "Kazz, Greg J (US 312B)" <greg.j.kazz at jpl.nasa.gov> 
To:        "Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int> 
Cc:        "Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>, 
"Matthew Cosby" <Matt.Cosby at Goonhilly.org> 
Date:        23/01/2021 18:48 
Subject:        FW: [EXTERNAL] Re: [Sls-slp] [SLS-CC] Joint C&S/SLP 

Hi Massimo,

If I recall correctly at the joint meeting in Dec. 2019, SLP WG concurred 
with you back in May 2019 on the use of the mandatory PN sequence by means 
of the 32-cell LFSR as you stated in your last email to me. The remaining 
undecided party at that time was NASA/GSFC, which later also agreed 
documented below in your email from Dec. 6. So as far as I can tell, the 
issue is resolved and can go now to agency review.

Best regards,
Greg

From: SLS-SLP <sls-slp-bounces at mailman.ccsds.org> on behalf of 
"Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>
Date: Friday, December 6, 2019 at 12:16 AM
To: "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>, 
"Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>, Space Link 
Coding & Synchronization Working Group <sls-cc at mailman.ccsds.org>, 
"sls-slp at mailman.ccsds.org" <sls-slp at mailman.ccsds.org>
Subject: [EXTERNAL] Re: [Sls-slp] [SLS-CC] Joint C&S/SLP

This message has been archived.  View the original item 

A brief update:

OID - the action on NASA/GSFC is closed. V. Sank confirmed the feasibility 
and the agreement (making the random pattern OID mandatory) is confirmed

USLP - the second action refers specifically to the concerns raised by 
Wolfgang Hell about "systematic retransmission" in section 4.2.10.8 of 
USLP with respect to 231.0
I'm sorry that my formulation in yesterday's notes was not clear.

Best regards,
Massimo

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
--------------------------------------------------

From:        Massimo.Bertinelli at esa.int
To:        brent.r.andres at nasa.gov, Enrico.Vassallo at esa.int, 
Gian.Paolo.Calzolari at esa.int, sls-cc at mailman.ccsds.org, 
sls-slp at mailman.ccsds.org
Date:        05/12/2019 18:33
Subject:        [SLS-CC] Joint C&S/SLP
Sent by:        "SLS-CC" <sls-cc-bounces at mailman.ccsds.org>
________________________________

Dear all,

a very brief summary of our discussion:

- OID
Most of the participants agreed to make the proposal (OID random pattern) 
mandatory.
Participants from NASA/GSFC asked for more time to confirm (or not) the 
decision
The proposal, once agreed, will be anyway subject to Agency Review
AI (V. Sank): report NASA/GSFC position by end of December 12

- TERMINOLOGY
G. Kazz/NASA presented a proposal to align the terminology (regarding 
re-transmission) of the protocol books (232.1-B-2 and 232.0-B-3) to that 
used in the coding
book (231.0-B)
G. P. Calzolari/AD stated that the change of terminology was not actually 
required, and proper referencing inside the protocol books would achieve 
the target.
This will translate in actions internal to the SLP WG and the issue, from 
the joint C&S/SLP point of view, is closed

- USLP
G. Kazz/NASA presented the (limited) changes required in 231.0-B (TC 
coding book) in order to reference 732.1 (USLP), stating how USLP already 
foresees this service
It was agreed background underlying the actual need for this change 
(possibly linked to Lunar missions) will be provide.
Besides, it was agreed to provide material (presentation/paper...) to show 
how the use of USLP would not be detrimental
to the TC service
AI (G. Kazz): provide rationale for the change
AI (G. Kazz): provide material about use of USLP with TC, showing 
compatibility

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
--------------------------------------------------

__________________

Dear all,

based on the results of the poll, we are going to have a first joint 
C&S/SLP discussion on the following topics on Thursday 5 December, 
starting at 4pm (CET).

- introduction of OID random pattern
- possible alignment of terminology in the TC books regarding 
retransmission
- additionally, SLP would like to discuss adding USLP to the TC coding 
book and assessing its impact (other books are mentioned in the 
presentation, but agreement on these ones has already been reached)

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