[CMC] RE: [CESG] RE: Draft-0.2 of CCSDS Liaison Report to IOAG-13/ File transfer issues

[Barkley, Erik J (317H)]

Adrian,

Minor correction on slide 2:  per the .xls file maintained in CESG CWE, dated 01 Sep 09, I count 8 books from the CSS area, not 7 as indicated in the chart (CSSM was released last month).  Also, you may wish to note an exact count of 51 recommendations (blue books + magenta books) , rather than 46+.  

I concur with the convening of a BOF, given the apparent ETE nature of the file transfer requested by IOAG.  

-Erik
________________________________________
From: cesg-bounces at mailman.ccsds.org [cesg-bounces at mailman.ccsds.org] On Behalf Of Hooke, Adrian J (9000) [adrian.j.hooke at jpl.nasa.gov]
Sent: Saturday, September 19, 2009 8:11 AM
To: 'cesg at mailman.ccsds.org'
Cc: CCSDS Management Council
Subject: [CESG] RE: Draft-0.2 of CCSDS Liaison Report to IOAG-13/       File transfer issues

Sorry, I forgot to attach the file…..

From: Of Hooke, Adrian J (9000)
Sent: Saturday, September 19, 2009 5:00 PM
To: 'cesg at mailman.ccsds.org'
Cc: CCSDS Management Council
Subject: [Secretariat] [CMC] Draft-0.2 of CCSDS Liaison Report to IOAG-13/ File transfer issues
Importance: High

CESG and CMC colleagues:

The CCSDS report to IOAG-13 will be delivered on Wednesday morning, 23 September. The current draft is attached – Nestor will shortly be adding some material on the representation of missions in CCSDS.

There are two significant issues which remain to be resolved, and they both center-around the CCSDS response to IOAG Resolution 12.9.1. If you remember, in Colorado Springs the CMC proposed the development of three specifications to the IOAG:
[cid:image001.jpg at 01CA394C.4B01B020]

The first issue has to do with the Magenta Books: basically, should there be two books or one, and is interoperability testing required? The SIS Area Director and I both feel strongly that the Colorado Springs agreement was to develop two separate Magenta Books. We also feel that since they are intended to specify how to interoperably and individually transfer CFDP across (a) a single long-haul TM/TC/AOS link and (b) a Prox-1 link, then some testing of interoperability is necessary. As noted on slide 11 of the attached draft report, this issue is listed as being “Under discussion in CCSDS”. However, we will soon need to make a decision and move on.

The second issue has to do with the Blue Book for ground/ground data transfer. Many in CCSDS interpreted this as simply a Magenta Book that specifies how to use Secure FTP for the purpose of transferring user file data across a ground interface, along with a syntax framework for associating metadata to the file. However, the IOAG’s response to the CMC’s Colorado Spring proposal has confused affairs by saying:
IOAG understanding of the proposed CCSDS standard on file transfers is that it shall cover all types of file transfers, i.e., for the single ground/space link and for the single space/space link.  It shall also cover the file transfers for the single space/space link for the purpose of Emergency Commanding and Essential Telemetry. This understanding is to be confirmed in the CCSDS resolution.
If this is saying that not only the containers need to be standardized, but also a complete specification for how to transfer files and emergency TM/TC end-to-end (including the semantics of their associated delivery metadata) then this could potentially be an enormous job that may exceed available CCSDS resources. As also noted on slide-11, I have stated “Will form BOF at CCSDS Fall 2009 meeting to discuss” and Nestor and I will seek clarification from IOAG-13 this week. If the IOAG indeed expects us to produce a full specification, then we will need to form and schedule such a BOF to estimate the scope of the work. File transfer is a Mission User application that is hosted in MOIMS and SOIS; data are moved using SIS, CSS and SLS.  I therefore propose that the Systems Engineering Area should convene this BOF during the Fall meeting.

Comments, suggestions and corrections are solicited. I will probably need to upload the report to the website by Monday noon, Rome time.

Best regards
Adrian