[CESG] "User Services" // SLS strategic goal 3 change

Shames, Peter M (312B) peter.m.shames at jpl.nasa.gov
Mon Apr 16 21:29:27 UTC 2018

Hi Gippo,

This looks good to me.   But don't you want these to be "efficient and inter-operable"

Thanks, Peter

From: Gian Paolo Calzolari <Gian.Paolo.Calzolari at esa.int>
Date: Monday, April 16, 2018 at 12:30 PM
To: Peter Shames <peter.m.shames at jpl.nasa.gov>
Cc: CCSDS Engineering Steering Group - CESG Exec <cesg at mailman.ccsds.org>, "Margherita.di.Giulio at esa.int" <Margherita.di.Giulio at esa.int>, Wallace Tai <wallace.s.tai at jpl.nasa.gov>, Gilles Moury <Gilles.Moury at cnes.fr>, Greg Kazz <greg.j.kazz at jpl.nasa.gov>, Matthew Cosby <matthew.cosby at goonhilly.org>
Subject: Re: "User Services" // SLS strategic goal 3 change

        after quick SLS discussion, we decided that we are going to change it to:

To provide efficient and operable space data link protocols and related interfaces to space link transfer services (for e.g. Space Packet Protocol, Encapsulation Service, IP over CCSDS)    capable of satisfying the needs of current and future missions;


Gian Paolo

From:        "Shames, Peter M (312B)" <peter.m.shames at jpl.nasa.gov>
To:        Gian Paolo Calzolari <Gian.Paolo.Calzolari at esa.int>
Cc:        "Margherita.di.Giulio at esa.int" <Margherita.di.Giulio at esa.int>, "Tai, Wallace S (9000)" <wallace.s.tai at jpl.nasa.gov>, "CCSDS Engineering Steering Group - CESG Exec" <cesg at mailman.ccsds.org>
Date:        16/04/2018 16:09
Subject:        "User Services"

Hi Gippo,

My suggestion is that you change "user services" on that last slide to something like "link layer interface and adaptation".  I do not believe that any of the things that SLS addresses are in any sense "user services".  But all of these SPP, Encap, IP over CCSDS are definitely interfaces to the link layer or adaptations to the link layer.

And yes, I do know that we talk, in the abstract, about service access points on all of our layers, which is where the "provided services" are exposed.  This is ISO speak.   But these are not really user services and to characterize them as such is somewhat confusing and also is outside the charter of SLS in general.

Thanks, Peter

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