<br>
<br><tt><font size=2>sls-slp-bounces@mailman.ccsds.org wrote on 16/06/2008
17:27:54:<br>
<br>
> Gian Paolo,<br>
> <br>
> > We would really appreciate knowing some details on the NASA/JPL
(Ed? <br>
> > Greg?) and JAXA (Takahiro?) implementations of this feature also
to <br>
> > understand how much those implementations are within the line
of the <br>
> > current standards.<br>
> <br>
> For deep space missions, we send each command frame (actually, it
is a <br>
> CLTU) multiple times in order to decrease the probability of <br>
> retransmission. For example, if we are to send command frames #1,
#2, <br>
> #3, and #4, we send #1, #1, #2, #2, #3, #3, #4, and #4. This is a
case <br>
> in which we send the same command twice and this is what we use for
our <br>
> asteroid mission, but we can send the same command any number of times.</font></tt>
<br>
<br><tt><font size=2>Takahiro, </font></tt>
<br><tt><font size=2> thank you for
your input. </font></tt>
<br><tt><font size=2>Do you investigate at CLTU level whether the CLTU
you transmit several times was generated by an AD, BD or BC frame?</font></tt>
<br>
<br><tt><font size=2>Ciao</font></tt>
<br>
<br><tt><font size=2>Gian Paolo</font></tt>
<br>
<br><tt><font size=2><br>
> <br>
> For doing retransmission, we use COP-1 as specified by CCSDS.<br>
> <br>
> I'm not sure if this violates the specification of COP-1 but I will
<br>
> check it when I have time.<br>
> <br>
> Best regards,<br>
> Takahiro Yamada.<br>
> <br>
> <br>
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