[Cesg-all] V2 GSCIDs usage

[John Garrett]

Hi Gian Paolo,

We do not freeze or block the corresponding V1 or V2 SCID/GSCID when one 
or the other is registered.  Another company is able to register the 
other one if it is available and most cases that happens.

There are currently many V1 and V2 GSCID assignments available.  
However, we have almost no chance of assigning a matching V1 SCID and V2 
SCID.

Sometimes, we do receive requests that the V1 SCID = V2 SCID (V1 GSCID 
+100 =  V2 GSCID). There are only a couple of cases where this is still 
possible.  But there is no real reason to need this matching.  I think 
everyone has adapted by now.

Sometimes, we do receive requests that the V1 GSCID = V2 GSCID (V1 GSCID 
- 100 =  V2 SCID).  There are a supply of these matches if people 
request that.  But again there is no real reason to need this matching.

Cheers,
-JOhn



Gian.Paolo.Calzolari at esa.int wrote:
>
>
> 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]
> ____________________________________________
>