[CMC] RE : [CESG] Draft-4 CCSDS report to IOAG-11

[Moury Gilles]

Adrian,

Just 2 comments on the proposed slides :

- slides 17, 18 : options 3 and 5 should not be options proposed by CCSDS for future cross-support by IOAG member agencies' ground infrastructure. Those options are technically unwise (adding unecessary overhead) and violates CCSDS recommended practice for IP packets transfer over CCSDS space links. This position has been expressed by ESA and CNES during the red book review of "IP over CCSDS links" (see attached RID)

- slide 7 : unreadable (editorial).

Best regards,

Gilles.
 

Gilles MOURY
CNES Toulouse


-----Message d'origine-----
De : cesg-bounces at mailman.ccsds.org [mailto:cesg-bounces at mailman.ccsds.org] De la part de Adrian J. Hooke
Envoyé : mardi 12 juin 2007 17:07
À : CCSDS Engineering Steering Group - ADs
Cc : greg.kazz at jpl.nasa.gov; CCSDS Management Council; kscott at mitre.org
Objet : [CESG] Draft-4 CCSDS report to IOAG-11
Importance : Haute


Attached is Draft-4 of the CCSDS Liaison report, which Nestor and I 
will deliver at next week's IOAG-11 meeting in Cebreros: 
http://www.ioag.org/IOAG-11/IOAG-11_home.htm

Please note the following changes:

1. Minor schedule changes on slides 8, 9 (from Erik)

2. Clarification of the Options in slides 16-18, including addition 
of slide 17.

The presentation is best viewed in slide show mode, as it is animated.

Best regards
Adrian
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                    REVIEW ITEM DISPOSITION (RID):
                    RED BOOK RID INITIATION FORM

AGENCY RID NUMBER: CNES 1
SUBMITTING ORGANIZATION (Agency, Center): CNES Toulouse
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REVIEWER'S NAME: Gilles MOURY
CODE:              
E-MAIL ADDRESS:  gilles.moury at cnes.fr  
TELEPHONE:  +33 561 273 790       
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DOCUMENT NUMBER:   CCSDS 702.1-R-2               Red Book, Issue 2
DOCUMENT NAME:     IP over CCSDS Space Links
DATE ISSUED:       January 2007
PAGE NUMBER:     2-1              PARAGRAPH NUMBER:  2.1
RID SHORT TITLE:   Removing option 3 (user-provided 
encapsulation) for recommended options
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DESCRIPTION OF REQUESTED CHANGE:  (Use From: "..." To "..." format)

Remove option 3 (both 3a and 3b) from recommended options for 
transferring IPv4 and IPv6 datagrams over CCSDS space data links.







------------------------------------------------------------------
CATEGORY OF REQUESTED CHANGE:
     Technical Fact X    Recommended __    Editorial ___
NOTES:
TECHNICAL FACT:  Major technical change of sufficient magnitude as to
 render the Recommendation inaccurate and unacceptable if not
 corrected.  (Supporting analysis/rationale is essential.)
RECOMMENDED:  Change of a nature that would, if incorporated, produce
 a marked improvement in document quality and acceptance.
EDITORIAL:  Typographical or other factual error needing correction.
 (This type of change will be made without feedback to submitter.)
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SUPPORTING ANALYSIS:
CCSDS space link protocols already provide all the capability needed
to transfer efficiently IP datagrams over CCSDS space data links. Those
are namely :
- direct insertion of IPv4 datagrams in CCSDS transfer frames (option 1)
- transfer of IPv4 and IPv6 datagrams using CCSDS encapsulation service
(option 2)
Option 3 is redundant with existing CCSDS mechanisms and furthermore
open the door to all kind of packet multiplexing protocols (like HDLC)
for which CCSDS agencies cannot provide any kind of cross-support.
For all these reasons, option 3 should not be mentionned as a recommended
option in the "IP over CCSDS links" magenta book. It is a possible solution
but surely not a CCSDS recommended one. 




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DISPOSITION: