[Css-csts] CSS - CSTS - CNES comments about generic services

[Rubio Jean-Claude]

Dear all,

Please find CNES approaches for generic services and some comments about ESOC technical note and Toolkit WhiteBook from Jaxa :

*	CNES approaches for generic services 
*	Context 
		CNES decides to adopt CCSDS standards for future programs
		But CNES operates 2 networks of ground stations and multi-mission facilities used for the control of satellites during positioning and in-orbit operations based on non-standard protocols...
		Key idea : migration of our GSN to SLE but keeping a compatibility ...
		First step : gateways...
		And after ... we wait for generic services to suppress gateways
*	CNES needs 
		Have an unique interface in our entities (ground stations, control centres) based on TCP/IP and SLE for standards services (as RAF, RCF, CLTU) and the capability to define some external/internal services based on the same concepts
		Possible services :
*	Data Stream : Return Unframed Telemetry, Ranging Data, Range Rate Data, Tracking Data, Ground Station Monitoring Data
*	Bit stream : Encrypted Telemetry
*	File Transfer : Pass reports, LogBooks
		How we imagine the implementation : an exemple...
		 <<...OLE_Obj...>> 

*	About ESOC Technical Note
*	We are totally agree with this approach. The generic toolkit has to define what are the commonalities in the actual services, in the operations and what parameters have to be mandatory. For these reasons, we think that it would be better to extract from generic toolkit the service dependant definition and to move it in the service definition recommendation.
*	table 3-1 Applicability to Return and Forward Services : INVOKE-DIRECTIVE is not identified as a generic operation, why ?  Can't we imagine a future service who needs this operation ? Is it not equivalent to THROW-EVENT ?
*	page 21: 'number-of-dataitems-radiated'
		We are not sure that a forward generic service always use a radiation status. We propose to change the name of this parameter.


*	About JAXA WhiteBook
*	 1-5-2 GENERIC SERVICE DOCUMENTATION TREE (page 1-3) : In the following sentence "this recommendation is part of a suite of documents specifying the Ground Domain Services", probably "Ground Domain Services" should be replaced by "Cross Support Services".
*	table 2-1 GENERIC service operation : for the case GENERIC-RETURN-TRANSFER-DATA, in the column "purpose", I think it would be better to read "to transfer data to the service user" instead of "to transfer data to the service provider ot to transfer data to the service user". Same thing for GENERIC-FORWARD-TRANSFER-DATA where we should read "to transfer data to the service provider". 
*	We dont't find in the white book what are the mandatory operations. Is it normal ? Do you put this information in the GuideLine ?  


We are agree to discuss about the documents during the teleconference on the 24th
Best regards 


> Jean-Claude RUBIO
> CNES Toulouse - Bpi 1212
DCT/OP/MR
> * 05.61.27.37.32, Fax 05.61.27.40.77
> * mailto:jean-claude.rubio at cnes.fr <mailto:jean-claude.rubio at cnes.fr> 
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