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<p class=MsoNormal>Dear CCSDS Coding & Sync WG,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I just want to confirm that the maximum allowable transfer
frame size is 1115 octets when one uses a Turbo code. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>A NASA mission in pre-phase A has approached me to ask if CCSDS
has completed any further studies per the comment in the current standard below
to allow missions to use the 2048 octet frame size. Have any
further studies been carried out or are planned by CCSDS ?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Currently Section 8 of the TM Sync and Channel Coding (<b><span
style='color:#29375B'><a
href="http://public.ccsds.org/publications/archive/131x0b1.pdf" target="_blank"><span
style='font-size:10.0pt;color:#29375B'>CCSDS 131.0-B-1</span></a> ) </span></b>states:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=Default><o:p> </o:p></p>
<p class=Paragraph3 style='margin-top:12.0pt;text-align:justify'><b><span
style='font-size:11.5pt;color:black'>8.6.2 </span></b><span style='font-size:
11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>Performance for
only the following information block lengths (i.e., Transfer Frame lengths) has
been validated by CCSDS and approved for use (values are in octets): <o:p></o:p></span></p>
<p class=MsoList style='mso-margin-top-alt:9.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt;text-align:justify;text-indent:-.25in'><span
style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>a)
223; <o:p></o:p></span></p>
<p class=MsoList style='mso-margin-top-alt:9.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt;text-align:justify;text-indent:-.25in'><span
style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>b)
446; <o:p></o:p></span></p>
<p class=MsoList style='mso-margin-top-alt:9.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt;text-align:justify;text-indent:-.25in'><span
style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>c)
892; <o:p></o:p></span></p>
<p class=MsoList style='mso-margin-top-alt:9.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt;text-align:justify;text-indent:-.25in'><span
style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>d)
1115; <o:p></o:p></span></p>
<p class=MsoList style='mso-margin-top-alt:9.0pt;margin-right:0in;margin-bottom:
0in;margin-left:.5in;margin-bottom:.0001pt;text-align:justify;text-indent:-.25in'><span
style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";color:black'>e)
2048. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";
color:black'>NOTE – Interleaver parameters for the length 2048 octets are
under study by the CCSDS. Until finalized, use of this option is not
recommended.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.5pt;font-family:"GAMHOJ+TimesNewRoman","serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Looking over the pink sheets (ccsds 131.0-P-1.1) I did not
see any new information on this section.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks and best regards,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Greg<o:p></o:p></p>
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