From Gian.Paolo.Calzolari at esa.int Mon Nov 3 18:10:37 2008 From: Gian.Paolo.Calzolari at esa.int (Gian.Paolo.Calzolari at esa.int) Date: Mon, 3 Nov 2008 19:10:37 +0100 Subject: [Sls-slp] Fwd: Re: Space Packet Protocol Green Book In-Reply-To: Message-ID: Peter, 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. Ciao Gian Paolo -------------- next part -------------- An HTML attachment was scrubbed... URL: From peter.shames at jpl.nasa.gov Mon Nov 3 19:42:17 2008 From: peter.shames at jpl.nasa.gov (Peter Shames) Date: Mon, 3 Nov 2008 11:42:17 -0800 Subject: [Sls-slp] Fwd: Re: Space Packet Protocol Green Book In-Reply-To: References: Message-ID: Hi GiPo, 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 discussions. Thanks, Peter On 3 Nov 2008, at 10:10 AM, Gian.Paolo.Calzolari at esa.int wrote: > > Peter, > 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. > > Ciao > > Gian Paolo _______________________________________________________ Peter Shames 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 first time" T .S. Eliot -------------- next part -------------- An HTML attachment was scrubbed... URL: