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

[Wolfgang.Hell at esa.int]

Dear Tom,

As already stated in my email dated August 2, we have discussed the matter
here in ESOC and came to the conclusion that as these corrections do not
affect existing implementations (at least not those we are aware of), our
inclination is to implement this as an editorial change. This position also
takes into account that as published the module was self-contradicting so
that this editorial error becomes evident to anybody who would try to
implement the standard.

That having said, if any other members of the working group feel more
comfortable with pursuing the more formal corrigendum approach, I would not
have a problem with that either.

Best regards,

Wolfgang




                                                                                                                                                
  From:       Thomas Gannett <tomg at aiaa.org>                                                                                                    
                                                                                                                                                
  To:         "Wolfgang.Hell at esa.int" <Wolfgang.Hell at esa.int>                                                                                   
                                                                                                                                                
  Cc:         "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>,   
              "css-csts at mailman.ccsds.org" <css-csts at mailman.ccsds.org>                                                                         
                                                                                                                                                
  Date:       18/08/2010 12:04                                                                                                                  
                                                                                                                                                
  Subject:    [Css-csts] Re: Error in the SLE Specifications                                                                                    
                                                                                                                                                
  Sent by:    css-csts-bounces at mailman.ccsds.org                                                                                                
                                                                                                                                                





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)

_______________________________________________
Css-csts mailing list
Css-csts at mailman.ccsds.org
http://mailman.ccsds.org/cgi-bin/mailman/listinfo/css-csts