[Moims-sc] Space Packet binding

Wed Mar 18 16:05:59 UTC 2015

Dear Peter,

David has gone through your comments and has proposed dispositions in the 
attached files. Most of your points have been accepted. 6 points have been 
labelled "to be discussed" and have either a question or a comment 
associated.

I would appreciate if you could go through the proposed dispositions, 
preferably before the Pasadena meeting, so that we could earmark some time 
there to go through any remaining issue face-to-face. Unfortunately, David 
will not attend the meeting: nevertheless we could arrange a splinter SM&C 
team who could meet with you and David (over a WebEx) to discuss. For 
logistic reasons this would be best in the (early) morning. Could you 
please identify in your agenda a slot for this next week?

Many thanks

__Mario

From:   "Shames, Peter M (312B)" <peter.m.shames at jpl.nasa.gov>
To:     "Mario.Merri at esa.int" <Mario.Merri at esa.int>, 
Cc:     "brigitte.behal at cnes.fr" <brigitte.behal at cnes.fr>, 
"danford.s.smith at nasa.gov" <danford.s.smith at nasa.gov>, 
"erwann.poupart at cnes.fr" <erwann.poupart at cnes.fr>, 
"Mehran.Sarkarati at esa.int" <Mehran.Sarkarati at esa.int>, 
"Michael.Wendler at dlr.de" <Michael.Wendler at dlr.de>, 
"roger.thompson at scisys.co.uk" <roger.thompson at scisys.co.uk>, 
"Sam.Cooper at scisys.co.uk" <Sam.Cooper at scisys.co.uk>, 
"Stefan.Gaertner at dlr.de" <Stefan.Gaertner at dlr.de>, David Feliot 
<david.feliot at scalagent.com>
Date:   16/03/2015 16:04
Subject:        Re: [Moims-sc] Space Packet binding

Dear Mario,

Sorry you are having problems with this.  The document is attached again 
here.   It appears that there was some problem with how I saved the doc, 
but I had a second copy with all of the comments intact (see screen shot 
of the first such comment).

Please ask me if anything is unclear.

Regards, Peter

From: Mario Merri <Mario.Merri at esa.int>
Date: Monday, March 16, 2015 at 7:53 AM
To: Peter Shames <peter.m.shames at jpl.nasa.gov>
Cc: Brigitte Behal <Brigitte.Behal at cnes.fr>, Dan Smith <
danford.s.smith at nasa.gov>, "erwann.poupart at cnes.fr" <
erwann.poupart at cnes.fr>, "Mehran.Sarkarati at esa.int" <
Mehran.Sarkarati at esa.int>, "Michael.Wendler at dlr.de" <
Michael.Wendler at dlr.de>, Roger Thompson <Roger.Thompson at scisys.co.uk>, "
Sam.Cooper at scisys.co.uk" <Sam.Cooper at scisys.co.uk>, "
Stefan.Gaertner at dlr.de" <Stefan.Gaertner at dlr.de>, David Feliot <
david.feliot at scalagent.com>
Subject: Re: [Moims-sc] Space Packet binding

Dear Peter, 

we have tried to access your comments, but unfortunately the pdf does not 
include any comment, despite it shows comment-holders. The commented YB is 
instead OK. Could you please resend the pdf to this distribution list?

Many thanks, 

__Mario

----- Forwarded by Mario Merri/esoc/ESA on 16/03/2015 14:54 -----

From:        Nestor.Peccia at esa.int
To:        moims-sc at mailman.ccsds.org, 
Date:        16/03/2015 13:36
Subject:        [Moims-sc] Space Packet binding
Sent by:        moims-sc-bounces at mailman.ccsds.org

from P. Shames 

SEA AD 

Shames Peter

APPROVE WITH CONDITIONS (state conditions that must be satisfied) 
http://public.ccsds.org/sites/cwe/cesg/polls/Shared%20Documents/524x1b0_CESG_Approval-SEA.pdf

http://public.ccsds.org/sites/cwe/cesg/polls/Shared%20Documents/MO%20SPP%20Prototype%20Test%20Report-v1-0-ps.doc

This document is vastly improved beyond the original and does a credible 
job of providing a rather complete binding from the MAL abstract data 
types and message formats to a concrete set of data types and SPP 
compliant message formats. 

There are, however, still a few loose ends that need to be tied down in 
order to ensure interoperability. They are flagged in the document and 
listed here: 

1) The "mapping configuration parameter" set (Sec 2.4.2 & Annex B) is a 
major element in interoperability, but it is listed as a "managed 
parameter" handled by some unspecified out of band agreement. Absent a way 
to acquire this key document interoperability is impossible. 

2) There are several issues in the text that must be corrected, such as 
stating that the APID Qualifier, an integer field, is to include a "/" 
character, the use of Packet Type" does not align with SPP defined usage, 
the handling of security / authentication. 

3) The handling of retransmission is left to "lower layers", but many 
CCSDS space link protocol deployments do not include such features. Is 
reliability, particularly of commanding, to be left to "lower layers", 
i.e. "bottom up" or is it a requirement applied by MO operations, top 
down? 

4) The test report appears to be quite thorough, but one key element 
required for interoperability, that pesky "mapping configuration 
parameter" set, is not even mentioned. Also, the details of the test 
configuration leave a lot to the imagination and it is not clear how 
anyone other than those involved in the test could insert their own MAL / 
SPP component and test it out. See notes on test report for more details.

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[attachment "524x1b0_CESG_Approval-SEA1.pdf" deleted by Mario 
Merri/esoc/ESA] [attachment "Screen Shot 2015-03-16 at 8.03.13 AM.png" 
deleted by Mario Merri/esoc/ESA] 
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