[Sls-slp] Proposed resolution to the COP-1 Technical Corrigendum

Mon Jan 28 17:29:26 UTC 2019

Dear SLS WG members,

Attached please find a proposal that was composed jointly by ESA and NASA to correct certain omissions (see additions in RED text) and to clarify certain statements in the COP-1. I have also included the text of the initial problem identified by INPE in-line below in this email.

Please review the proposed solution in the attachment and let me know if you have any comments or concerns associated with it by Feb 11, 2019.

Best regards,

Greg Kazz
Chairman SLS-SLP WG

_______________________________________________________________________________________________________________________________________________________________________
From:        "Eduardo W. Bergamini" <eduardo.w.bergamini at outlook.com<mailto:eduardo.w.bergamini at outlook.com>>
To:        "Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>" <Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>>
Cc:        João Manoel Rocha Zaninotto <joao.zaninotto at inpe.br<mailto:joao.zaninotto at inpe.br>>, "Eduardo Andres Serrano Velasquez, Sr. - Secretarias SC08:010-CB:08/ABNT (andres.serrano at lit.inpe.br<mailto:andres.serrano at lit.inpe.br>)" <andres.serrano at lit.inpe.br<mailto:andres.serrano at lit.inpe.br>>
Date:        05-12-18 03:15
Subject:        ENC: 3rd trial: 2nd. trial: Request for (urgent) support. Please, confirm this message.
________________________________

Dear Gian Paolo,

In my role as the Coordinator of ABNT/Brazil Commission of Study CE:08.010.70, ABNT equivalent working group to ISO TC20/SC13 Subcommittee, we are about to submit to ABNT Editorial

Coordination and Management a document derived from one of our Projects, in this case, to become an ABNT Standard, naturally, edited in Portuguese, to be equivalent to CCSDS

Recommendation CCSDS 232.1-B-2:2010 ( Communications Operation Procedure-1. Blue Book. Issue 2. September 2010. / https://public.ccsds.org/Pubs/232x1b2.pdf<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpublic.ccsds.org%2FPubs%2F232x1b2.pdf&data=02%7C01%7C%7C51ddbd5ed2574b9ced8a08d65b88d196%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636797040517804766&sdata=hv4xYvHWwj%2B%2FreJF6QLLWLh38DdfSh1ldOf7T7VbzZI%3D&reserved=0> ) and ISO Standard

ISO 22667:2013 (Space data and information transfer systems -- Communications operation procedure-1). After a detailed, joint review with ABNT, the resulting candidate document derived

from this Project is, in principle very close to its final editorial version, to be now evaluated by ABNT in the form a “Public Consultancy” that is expected, perhaps with some additional, now

minor corrections, result in an actual, new ABNT Standard. Good.

However, one single pending issue of technical nature is still holding the actual submission of the above mentioned document to ABNT for accomplishment of its final editorial stage. I explain.

The author of the above mentioned Project, Member of the ABNT Commission of Study CE:08.010.70, Eng. João M. R. Zaninotto, after discussing with me on the subject, could kindly compile

a comprehensive, clear explanation of the just above mentioned, pending issue related to his Project, as you can find in his message, as reproduced below.

In your role as the AD of CCSDS CESG Space Link Services (SLS) Area, I  ask you, please, to take the initiative to get in contact with the person ( Greg Kazz, Chair of SLS-SLP WG?) you find to be

more appropriate and ask the contacted to carefully look over the message reproduced below in a way that I may receive the answer from CCSDS (you) in the shortest possible time that would

let us know how to correctly interpret items 1 and 2, as they are strictly presented, but in an apparently conflicting fashion, as presented in the original CCSDS 232.1-B-2:2010 Recommendation.

Of course, we have to care in our side that the planned ABNT/Brazil corresponding standard may correctly reflect a precise, correct interpretation of the just mentioned CCSDS Recommendation

aspect (and of the corresponding ISO Standard), therefore, in a way that no margin for misinterpretation on this specific subject may result in the corresponding, planned ABNT Standard. It

could be instrumented in the form of appropriately inserted additional notes in the ABNT document

I have the feeling that, in view of the incongruency found between what is presented in section 6.1.8.2 FARM_Sliding_Window_Width (W) / Page 6-4,  in comparison to what is presented in

Table 7-2: FARM-1 Managed Parameters / Page 7-2, in respect to the parameter “W” of Recommendation CCSDS 232.1-B-2:2010, the concerned CCSDS technical expertise may advise us to

consider the addition of a conveniently written NOTE, by the Translator/Author of the planned ABNT Standard. Possibly, such a NOTE would express what should be the correct interpretation

that may permit the correct assignment of the “W” parameter in a real application, in view of the, at least apparent, existing incongruency or conflict found in respect to the assignment of this

“W” parameter, when comparing what is being presented in section 6.1.8.2 and in Table 7-2 of Recommendation CCSDS 232.1-B-2:2010 .

Thank you in advance for your effort and action to my request.

Please, confirm this message. Thank you.

Looking forward.

With my best regards,

Eduardo

Cc. Eng. João M. R. Zaninotto,

      - Responsible for ABNT Project of Standard 08:010.70-012 (Related to CCSDS 232.1-B-2:2010 / Standard ISO 22667:2013)

      - Member CE:08.010.70/ABNT

-----

EDUARDO W. BERGAMINI

- INPE/CCSDS

- ABNT/ISO TC20/SC13

- Coord. ABNT CE:08.010.70
Information Networks in Space Missions - RME
Instituto Nacional de Pesquisas Espaciais - INPE
Ministry of Science, Technology, Innovations and Communications - MCTIC
Avenida dos Astronautas, 1758
12227-010 São José dos Campos, SP
BRAZIL
Phones : +55 12 3208 6166/6150
Secretariat: +55 12 3208 6165/6603

_________________________________________________________________________________________________________________________________________________________________

De: João Manoel Rocha Zaninotto <joao.zaninotto at inpe.br<mailto:joao.zaninotto at inpe.br>>
Enviada em: sexta-feira, 23 de novembro de 2018 08:59
Para: Eduardo W. Bergamini <eduardo.w.bergamini at outlook.com<mailto:eduardo.w.bergamini at outlook.com>>; secretaria.rme at gmail.com<mailto:secretaria.rme at gmail.com>
Assunto: CCSDS document

Dear Dr. Bergamini,

As per our previous conversation, I am sending you my considerations about the following CCSDS document:

         Recommendation for Space Data System Standards

         Communications Operation Procedure-1

         Recommended Standard

         CCSDS 232.1-B-2:2010 (correspondent to Standard ISO 22667:2013)

         September 2010

in respect to the range of values of the variable FARM_Sliding_Window_Width (W), as defined in the chapters below.

As you may recall, in our understanding there is an apparent divergence of definition of the values the variable “W” that can be drawn from the a defined, valid range but, under apparently

observing TWO different approach, depending if the value of the variable “W” is drawn from what is stated in section 6.1.8.2 FARM_Sliding_Window_Width (W) or, from what is stated in

Table 7-2: FARM-1 Managed Parameters of the same document (CCSDS 232.1-B-2:2010). Namely, this can be illustrated, as it is presented in the mentioned document, as follows:

------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1)      6.1.8.2 FARM_Sliding_Window_Width (W), as it is presented in Page 6-4 of Recommendation CCSDS 232.1-B-2:2010:

The FARM_Sliding_Window_Width is referred to as ‘W’ and gives the range over which the Frame Sequence Numbers

of received Type-AD Transfer Frames may vary without lockout occurring.

The value ‘W’ shall be set to a value between the following limits:

                                 [cid:image001.jpg at 01D4831B.FFDFCE00]

where ‘W’ is always an EVEN integer.

Unless otherwise specified, the value ‘W’ shall be fixed for the entire duration of the mission.

In particular, there are no COP-1 control commands for changing the value.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------

2)      Table 7-2: FARM-1 Managed Parameter, as it is presented in Page 7-2 of Recommendation CCSDS 232.1-B-2:2010:

Managed Parameter

Allowed Values

FARM_Sliding_Window_Width (W)

2, 3, … or 254

FARM_Positive_Window_Width (PW)

(Must be equal to W/2)

FARM_Negative_Window_Width (NW)

(Must be equal to W/2)

CLCW reporting period (seconds)

Real number

---------------------------------------------------------------------------------------------------------------------

DETAILING THE REASON FOR MY ADDRESSING:

My understanding is that according to chapter 6.1.8.2 the variable “W” should be an “EVEN integer” in the range of 2 ≤ W ≤ 254. On the other hand, according to Table 7-2 allowed values of “W” are in

the range  of “2, 3,… or 254”,  meaning that odd and even integers would be possible to use, in that range. Which seems to not be the case, in view of what is stated in section 6.1.8.2 FARM_Sliding_

Window_Width (W) of the same Recommendation.

In view of the above comments, I would appreciate your attention confirming the pertinence of my doubt and clarifying this subject with CCSDS authors that may be in a position to handle this

pendency we have, in order to be in a condition to submit in our very 1st opportunity the final document to ABNT/Brazil for approval as a new ABNT Standard. .

Yours sincerely,

JOÃO MANOEL ZANINOTTO, Eng.

Author of the ABNT Project 08.010.70-012
Member of CE:08.010.70/ABNT

Greg Kazz
Principal Engineer
Technical Group Supervisor,
Project Software and End-to-End Information Systems Engineering (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

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