[Sls-slp] Fwd: Re: Space Packet Protocol Green Book
peter.shames at jpl.nasa.gov
Mon Nov 3 19:42:17 UTC 2008
Thanks for the very useful feedback. I think that further dialogue on
the GB will be very useful and am glad to hear that you support doing
this and keeping the GB close to actual functionality that is defined
in the SPP itself. I believe that this is an important precept to
keep in the forefront as we discuss the SPP GB draft.
At the same time I do believe that it is possible, within the context
of the GB, to discuss things that could be done with the SPP to
accomplish certain mission and ground data system functions. We just
need to be very careful to clearly distinguish that which is clearly
and unambiguously standardized as far as SPP functionality, and those
approaches that are possible mission specific adaptations or uses, but
that are not standardized or described in the required unambiguous,
implementable, interoperable, fashion.
The version of the document that I attached had significant changes
and comments and I would request that you and the rest of the WG use
that as a source of input. I used MS Word with "track changes" turned
on, and I used highlighting and added comments, so it should be
relatively easy to see the changes that i propose and the issues that
I think need further discussion.
What I tried to do, as i stated in my note, was to provide re-wordings
of all of the troublesome sections so that we had a final document
that did not mis-led our users as to what the spec, as it exists
today, is actually providing as services and what the users, if they
wishes to define extended meanings, could construct on top of it.
Please use my draft, "SPP_DGB5-ps-16Oct08.doc", as the input to the WG
On 3 Nov 2008, at 10:10 AM, Gian.Paolo.Calzolari at esa.int wrote:
> many of the things you say are correct (I say that - I admit
> - without reading carefully the green book after the long reading of
> your note :-).
> The fact is that the Source Packet (eventually named Space Packet)
> was invented for Packet Telemetry and later used on top of AOS
> frames with some limited networking capabilities.
> In this respect I think it would be good if the green book, instead
> of trying to find "valid" supporting motivation for the technical
> aspects of SPP, would recover this historical aspects telling the
> truth to the readers.
> This would be clearly inadequate for a Blue Book but it can be very
> explanatory for a Green Book since - I agree with you - trying to
> define today standard thorough routing mechanisms for the Space
> Packet would be overkilling.
> It really looks as the green books deserves more discussion.
> Gian Paolo
Manager - JPL Data Systems Standards Program
InterPlanetary Network Directorate
Jet Propulsion Laboratory, MS 301-230
California Institute of Technology
Pasadena, CA 91109 USA
Telephone: +1 818 354-5740, Fax: +1 818 393-0028
Internet: Peter.Shames at jpl.nasa.gov
"We shall not cease from exploration, and the end of all our exploring
will be to arrive at where we started, and know the place for the
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the SLS-SLP