[Css-csts] Re: Error in the SLE Specifications

[Wolfgang.Hell at esa.int]

Dear Tom,,

After careful analysis of any conceivable impact this changes could possibly
have on any existing implementations, we came to the conclusion that the
discovered inconsistencies should be corrected by means of an editorial
change as you outline below. Thank you for taking care of this. If you
require any further input beyond the corrected module that I had sent to you
already, please let me know.

Best regards,

Wolfgang



                                                                                                                                                
  From:       Thomas Gannett <tomg at aiaa.org>                                                                                                    
                                                                                                                                                
  To:         "Wolfgang.Hell at esa.int" <Wolfgang.Hell at esa.int>                                                                                   
                                                                                                                                                
  Cc:         "css-csts at mailman.ccsds.org" <css-csts at mailman.ccsds.org>, "Michael.J.Stoloff at jpl.nasa.gov" <Michael.J.Stoloff at jpl.nasa.gov>,     
              "Erik.J.Barkley at jpl.nasa.gov" <Erik.J.Barkley at jpl.nasa.gov>                                                                       
                                                                                                                                                
  Date:       29/07/2010 20:55                                                                                                                  
                                                                                                                                                
  Subject:    Re: Error in the SLE Specifications                                                                                               
                                                                                                                                                





Dear Wolfgang:

FSP and F-CLTU have already been approved and published, so whatever is
done will have to be done to all five books.  Corrigenda would be the
obvious approach, but if the change is truly editorial (i.e., if there
is no technical impact to making the change), we could implement it as
an editorial change in the documents.  That would involve simply
updating the books with the corrected module and making note of the
change on the document control page.  Treating the change as an
editorial change would obviate CESG/CMC approval and speed things up
considerably, but I defer to you on the question of whether the change
can be considered anything more than editorial (in which case we would
be obliged to pursue the more formal corrigendum approach).

Best regards,
Tom

On 7/29/10 5:25 AM, Wolfgang.Hell at esa.int wrote:
> Dear Tom,
>
> JPL and ESA are in the process of agreeing some simplifications of the SLE
> configuration needs and in that context we are developing some conventions
> regarding the specification of SLE Service Instances, in particular how to
> build the Service Instance Identifier. In the process of doing that I also
> checked the draft conventions against the CCSDS SLE standards. In the
course
> of doing that I found that the pertaining ASN.1 module contains some
errors.
> > From looking at what is incorrect it becomes clear that these are purely
> editorial errors, for the most part too much copy and paste, rather than an
> intent to change conventions that have been applied by the SLE implementers
> since years. In fact, as it stands, the module is self contradicting:
>
> -- Service Name identifier,
> --       the name of which is:   "cltu"
> --       the value of which is:  "cltu" plus an instance number;
>
> but it also states:
>
> -- +++++++++++++++++++++++++++++++++++++
> -- CLTU Service Definition
> -- The cltu Service Id starts with "onlc" or "onlt" or "offl" and is
> -- followed by the instance number.
> cltuService ATTRIBUTE      ::=   {  ID cltu  }
>
> In the attachment you will find the current version of the ASN.1 module as
> well as the same module with the corrections implemented (track changes on)
> that need to be applied. I have reviewed the corrections that I'm proposing
> here with Yves and Margherita and they are in agreement. Note that this
> module is the same in alll SLE Transfer Service specifications.
>
> I hope that this message is just in time for putting the corrected ASN.1
> module before F-CLTU and FSP are officially published further to the CESG
> approval. Would you think that for the return services a corrigendum will
be
> the appropriate way to go?
>
> Best regards,
>
> Wolfgang
>
> (See attached file: SII as is.doc)(See attached file: SII as it should
> be.doc)