[Cesg-all] V2 GSCIDs usage

[Gian.Paolo.Calzolari at esa.int]

cesg-all-bounces at mailman.ccsds.org wrote on 02-07-2009 19:26:34:

> Hi,
> 
> When registering V2 CCSDS Spacecraft IDs, we have routinely been sending 

> out a confirmation that includes this
> statement:
> 
> As a reminder, Version 2 SCIDs are only useful for telecommand when 
> using AOS-VCDU.
> 
> I just wanted to check that this still remains accurate.

John, 
        just a silly doubt/clarification.

v2 SCIDs are 8 bits long while v1 SCIDs are 10 bits long (as per CCSDS 
320.0-B-5 and other books).
Therefore v2 SCIDs are a subset of v1 SCIDs (numerically speaking).
In principle one could use a 8 bits v1 SCID on a spacecraft and the same 
(value) 8 bits  v2 SCID since they would generate different GSCIDs (being 
GSCID = VN . SCID i.e. concatenation). The same can be extended to v3 SCID 
values of course.

If you assign a value as v2 SCID, what do you do with the same value as v1 
SCID?
Do you freeze it or is it available for somebody else (even belonging to 
another space agency)?
I assume that a space agency can request to have allocated the same value 
as v1 and v2 SCID. Correct?

Thanks

Gian Paolo



____________________________________________
 
Gian Paolo Calzolari 
Systems Engineer, OPS-OT

European Space Agency ESA/ESOC
Robert Bosch Str. 5
D-64293-Darmstadt
Tel +49-6151-902913 fax +49-6151-902962
http://www.esa.int/esoc    Email: Gian.Paolo.Calzolari[at]esa.int 
[replace [at] with @ for the correct e-mail address]
____________________________________________

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