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<p class="MsoNormal">Hi Jim,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Some answers below in <span style="color:#4472C4">blue</span>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">-----------------------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal">Marc Sanchez Net (332H)<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:gray">Telecommunications Engineer</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:gray">Jet Propulsion Laboratory<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:gray">Cell:</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><a href="mailto:(617)%20953-7977"><span style="color:#0563C1">(617)
953-7977</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span style="font-size:10.0pt;color:gray">|</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span style="font-size:10.0pt;color:gray">Email:</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span style="color:black"><a href="mailto:marc.sanchez.net@jpl.nasa.gov"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">marc.sanchez.net@jpl.nasa.gov</span></a></span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal">-----------------------------------------------------------------------------------------------------------------------<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> SIS-DTN <sis-dtn-bounces@mailman.ccsds.org> <b>
On Behalf Of </b>Jim.Bardgett--- via SIS-DTN<br>
<b>Sent:</b> Monday, February 27, 2023 5:03 AM<br>
<b>To:</b> Sis-dtn@mailman.ccsds.org<br>
<b>Subject:</b> [EXTERNAL] [Sis-dtn] practical size of the TC frame<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hoping someone can point me in the right direction on this one. I’m assisting a colleague and we have questions about the frame size limitation:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo1">
Upper TC frame size is 1019. Is the size fixed to 1019? Can it be larger and what would the implications be?
<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#4472C4">The max size of a TC frame including header is 1024 bits. I believe this is due to the limited num. of bits in the header to encode the length of the
transfer frame.<o:p></o:p></span></p>
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<p class="MsoNormal"><img border="0" width="356" height="167" style="width:3.7083in;height:1.7395in" id="Picture_x0020_1" src="cid:image001.jpg@01D95B23.6012AD40"><o:p></o:p></p>
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<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo2">
Lower TC Sync Ch Coding CLTU <o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#4472C4">Each TC frame must fit in one CLTU. Therefore, if using coding, you must fit the number of bits in a TC frame in an integer number of codewords at the
Sync & Coding layer. For example, if using BCH (64,56) and a TC frame of 1024 bits, each CLTU will have ceil(1024/56)=19 BCH codewords, the last of which will have padding bits.<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Is there a size limitation for Lower TC protocol CLTU?<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#4472C4">On the lower end, you need at least one codeword per CLTU, so depending on which code you use, the limitation will vary. For BCH (64,56), the min size
of CLTU is 144 symbols, 16 for the start sequence, 64 for the BCH codeword (i.e., 1 BCH codeword), and 64 more for the tail sequence.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#4472C4">The upper limit on the CLTU size is given by the max TC frame size. Another factor is to ensure that the receiver maintains lock when start sequences
(which act as sync markers) are increasingly further apart, which depends on SNR conditions, etc.<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
In at least one document it says:<o:p></o:p></li></ul>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
TC transfer frame between the CLTU start/tail sequences has a max length of 1024 bytes<o:p></o:p></li></ul>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">I’m believing these are the right references for my question. Is that in error?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Thanks and kind regards,<o:p></o:p></p>
</div>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt">Jim Bardgett</span></b><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt">Sr. Manager Cyber – Networks | Ch. Technologist Ntwk Engn
</span></b><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:9.0pt">MS Digital Forensics, BSE Electrical, CISSP, CEH, JNCIS-ENT/SEC</span></b><o:p></o:p></p>
</div>
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<p class="MsoNormal"><span style="color:#CF102D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#CF102D;text-transform:uppercase">Space and airborne systems / L3HARRIS TECHNOLOGIES</span></b><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri Light",sans-serif">m +1 407 538 0431 / t +1 321 309 7164</span><o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:L3Harris.com"><span style="font-size:9.0pt;font-family:"Calibri Light",sans-serif">L3Harris.com</span></a><span style="font-size:9.0pt"> </span><span style="font-size:9.0pt;font-family:"Calibri Light",sans-serif"> /
</span><a href="mailto:jim.bardgett@L3Harris.com"><span style="font-size:9.0pt;font-family:"Calibri Light",sans-serif;color:#0563C1">jim.bardgett@L3Harris.com</span></a><o:p></o:p></p>
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