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

[Thomas Gannett]

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)