[Css-csts] Re: An update to the ROCF SLE recommendation that can be done by the scretariat

Thu May 21 10:21:42 UTC 2015

Dear All,

I'm in favor of promoting whenever possible the use of CCSDS standards 
and if we can do something that helps the reader and therefore potential 
"customer" to digest the sometimes fairly complex material, I won't 
object. However, given that the SLE services extend the space link by 
providing a standard mechanism to access space link data, in my mind it 
is implied that understanding SLE services requires familiarity with the 
space link protocols which define the data that SLE services deal with. 
In fact, all SLE books have been written with that understanding in 
mind. I completely agree with Peter's analysis that the ROCF book 
contains all relevant references to the space link protocols and as such 
is complete. I also completely agree that in CCSDS we deal with other 
relevant standards by reference rather than inclusion. I'm sure we all 
agree that SLE books are not the right place to present Green Book type 
material related to space link protocols.

In the spirit of helping the reader I do not mind adding a sentence or 
two regarding why the ROCF service got "invented". However, my concern 
regarding the sentence proposed by Peter is that it might create the 
impression that the only purpose of the OCF is carrying the CLCW. While 
undoubtedly in most cases this is what the OCF is used for, other OCF 
types exist as well and are covered in detail in the ROCF-START 
operation. Therefore, if we add any material explaining what the OCF is, 
we shall not limit it to the CLCW case. Even if we add some explanation 
of what the OCF is, the reader may still fail to grasp why we cared to 
"invent" the ROCF service, given that via RAF and/or RCF we can get the 
frames that contain the OCFs of interest as well. We should add a few 
words regarding the potential need for low-latency delivery of the OCFs 
also in cases where the total space link data rate (significantly) 
exceeds the terrestrial communications bandwidth.

Best regards,
Wolfgang

Am 20.05.2015 um 12:18 schrieb Margherita.di.Giulio at esa.int:
> Dear Erik and All,
> I managed to read the sequence of e-mails on this subject  only today, 
> as I am on mission for the whole week, I have no problem with 
> instructing Secretariat about the introduction of the suggested 
> sentence. However, one should first look into the R-OCF Recommendation 
> and think of the appropriate place where to put it. Also, one may want 
> to check if analogous sentences need to be introduced in  other SLE 
> Recommendations.
> I will have time to look into this only next week ( and I will 
> coordinate with Wolfgang).
> I do not know how far  the editor is with the Pink Books ( may be Tom 
> can tell us), If there is still a chance  to introduce this change, 
> say by the end of next week, then it is all right. Otherwise, we can 
> keep this change in mind as a RID to be issued during the agency 
> Review, as somebody suggested in one of the pervious e-mails.
> Kind regards,
> Margherita
>
> -------------------------------------------------------------
> Margherita di Giulio
> Ground Station Back-end Section (HSO-GIB)
> European Space Agency ESA/ESOC
> Robert-Bosch-Str. 5
> D-64293 Darmstadt - Germany
> Tel: +49-6151-902779
> e-mail: Margherita.di.Giulio at esa.int
>
>
>
>
> From: "Barkley, Erik J (3970)" <erik.j.barkley at jpl.nasa.gov>
> To: "Margherita.di.Giulio at esa.int" <Margherita.di.Giulio at esa.int>, 
> "Wolfgang_._Hell at t-online.de" <Wolfgang_._Hell at t-online.de>, 
> "Holger.Dreihahn at esa.int" <Holger.Dreihahn at esa.int>,
> Cc: "Shames, Peter M (312B)" <peter.m.shames at jpl.nasa.gov>, "CCSDS 
> Secretariat (thomas.gannett at tgannett.net)" 
> <thomas.gannett at tgannett.net>, "John Pietras (pietras at gst.com)" 
> <pietras at gst.com>, "css-csts at mailman.ccsds.org" 
> <css-csts at mailman.ccsds.org>
> Date: 13/05/2015 21:03
> Subject: An update to the ROCF SLE recommendation that can be done by 
> the scretariat
> ------------------------------------------------------------------------
>
>
>
> Margherita, Wolfgang, Holger,
>
> With regard to the SLE books about to have pink sheet reviews, a 
> question (please see previous email today) arose about adding an 
> editorial sentence to the SLE blue books.  Peter has suggested the 
> following addition to the ROCF blue book:
>
>
> "TC defines and uses the CLCW, which is carried in the TM (or AOS) OCF 
> field for use in COP re-transmission operations.  The ROCF service is 
> used to provide this CLCW to the user so that these re-transmission 
> operations may be implemented in the user MOC."
>
> We can issue specific instructions to the secretariat as to exactly 
> where to add this type of sentence.  It seems reasonable to me.  I 
> would appreciate your comments on doing this, and if you concur I see 
> no reason why this could not be included as part of the pink sheets 
> going out for agency review.
>
> Best regards,
>
> -Erik
>
> This message and any attachments are intended for the use of the addressee or addressees only.
> The unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its
> content is not permitted.
> If you received this message in error, please notify the sender and delete it from your system.
> Emails can be altered and their integrity cannot be guaranteed by the sender.
>
> Please consider the environment before printing this email.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/css-csts/attachments/20150521/20390169/attachment.html>