[Sls-slp] SLS-SLP Presentation to SLS area Plenary

Gian.Paolo.Calzolari at esa.int Gian.Paolo.Calzolari at esa.int
Mon Jun 16 16:13:18 UTC 2008

sls-slp-bounces at mailman.ccsds.org wrote on 16/06/2008 17:27:54:

> Gian Paolo,
> > We would really appreciate knowing some details on the NASA/JPL (Ed? 
> > Greg?) and JAXA (Takahiro?) implementations of this feature also to 
> > understand how much those implementations are within the line of the 
> > current standards.
> For deep space missions, we send each command frame (actually, it is a 
> CLTU) multiple times in order to decrease the probability of 
> retransmission. For example, if we are to send command frames #1, #2, 
> #3, and #4, we send #1, #1, #2, #2, #3, #3, #4, and #4. This is a case 
> in which we send the same command twice and this is what we use for our 
> asteroid mission, but we can send the same command any number of times.

        thank you for your input. 
Do you investigate at CLTU level whether the CLTU you transmit several 
times was generated by an AD, BD or BC frame?


Gian Paolo

> For doing retransmission, we use COP-1 as specified by CCSDS.
> I'm not sure if this violates the specification of COP-1 but I will 
> check it when I have time.
> Best regards,
> Takahiro Yamada.
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