<font size=2 face="sans-serif">Dear Peter,</font>
<br><font size=2 face="sans-serif"> I
never said that the current situation is perfect.</font>
<br><font size=2 face="sans-serif">However i do find inappropriate having
a term that means alfa till today and it will mean beta as of tomorrow.</font>
<br><font size=2 face="sans-serif">Regards</font>
<br><font size=2 face="sans-serif">Gian Paolo</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">"Shames, Peter
M (312B)" <peter.m.shames@jpl.nasa.gov></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">"Gian.Paolo.Calzolari@esa.int"
<Gian.Paolo.Calzolari@esa.int>, "CCSDS CESG --" <cesg@mailman.ccsds.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Cc:
</font><font size=1 face="sans-serif">"Tom Gannett"
<thomas.gannett@tgannett.net></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">12/07/2016 18:58</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [CESG] Why
renaming GSCID inf revised CCSDS SCID Code Assignment Control Procedures?</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=2 face="Calibri">Dear Gippo,</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=2 face="Calibri">I appreciate your attention to detail and
looking at this early on, but I have to differ re some conclusions.
I note the following:</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=3 face="Calibri">- </font><font size=2 face="Calibri">The
term GSCID was defined </font><font size=3 face="Calibri">as “</font><font size=3 face="Times">GSCID
= VN <b>. </b>SCID”</font><font size=2 face="Calibri"> where the “</font><font size=3 face="Times"><b>.</b></font><font size=2 face="Calibri">”
means concatenation.</font>
<br><font size=3 face="Calibri">- </font><font size=2 face="Calibri">The
terms SCID and GSCID are used more or less interchangeably in the CCSDS
320x0b document, but they mean different things. This is a flaw in
the current document that I have tried to remedy.</font>
<br><font size=3 face="Calibri">- </font><font size=2 face="Calibri">The
term SCID is defined specifically in the various protocol documents, 320x0
just references it.</font>
<br><font size=3 face="Calibri">- </font><font size=2 face="Calibri">The
term GSCID <b><i>does not</i></b> appear in any of our protocol documents,
TC, TM, or AOS. They tend to call the combination of the VN (actually
the TFVN) and the SCID an MCID, not a GSCID.</font>
<br><font size=3 face="Calibri">- </font><font size=2 face="Calibri">If
you search the CCSDS files you will find that the only reference to GSCID
is in this 320x0 document, and not in any others.</font>
<br><font size=2 face="Calibri">All of that said, I think that there is
really no impediment in the way of extending the definition of GSCID to
include the frequency band, because globally, in fact, the frequency band
has from the beginning been a part of the actual physical and logical link
layer signal. We just did not acknowledge this until now.</font>
<br><font size=2 face="Calibri">But if you are worried about some confusion
for others we could introduce a new term for the FB </font><font size=3 face="Times"><b>.
</b></font><font size=2 face="Calibri">VN </font><font size=3 face="Times"><b>.
</b></font><font size=2 face="Calibri">SCID combination. I’m reluctant
to call it a “Super” SCID, that sounds like a kid’s toy. ;-}
And in truth, I think that this is more of a Global SCID than the
current definition, and which the protocol docs call an MCID. In
effect we have given the same thing two different names, surely that is
not a good approach? Maybe we should align this book with all of
the existing protocol docs and call the VN </font><font size=3 face="Times"><b>.
</b></font><font size=2 face="Calibri">SCID combo an MCID and the FB </font><font size=3 face="Times"><b>.
</b></font><font size=2 face="Calibri">VN </font><font size=3 face="Times"><b>.
</b></font><font size=2 face="Calibri">SCID combo the GSCID?</font>
<br><font size=2 face="Calibri">I am open to other suggestions.</font>
<br><font size=2 face="Calibri">Regards, Peter</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=2 face="Calibri"> </font>
<br><font size=3 face="Calibri"><b>From: </b>CESG <cesg-bounces@mailman.ccsds.org>
on behalf of Gian Paolo Calzolari <Gian.Paolo.Calzolari@esa.int><b><br>
Date: </b>Tuesday, July 12, 2016 at 6:18 AM<b><br>
To: </b>CCSDS Engineering Steering Group - CESG Exec <cesg@mailman.ccsds.org><b><br>
Cc: </b>Tom Gannett <thomas.gannett@tgannett.net><b><br>
Subject: </b>[CESG] Why renaming GSCID inf revised CCSDS SCID Code Assignment
Control Procedures?</font>
<br><font size=3 face="Times New Roman"> </font>
<br><font size=2 face="sans-serif">Dear CESGers,</font><font size=3 face="Times New Roman">
</font><font size=2 face="sans-serif"><br>
in order to gain time and not to delay eventual
Poll and start of Agency Review, I would like to anticipate that as SLS
AD I wonder about the need of renaming GSCID in revised CCSDS SCID Code
Assignment Control Procedures.</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="sans-serif"><br>
In fact the revised book includes a new definition of GSCID (see snapshot)
that is conflicting with the definition in the Blue Book in force (see
second snapshot) as the new one also refers to Frequency Band.</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="sans-serif"><br>
First of all I think that it is not appropriate modifying a term used for
so many years (and for sure spread in "billions" of documents
from many agencies) also considering that the the prefix "Global"
is widely used for e.g. the Global VCID and Global MAP ID (for sure in
SLE and SLS books) without considering the Frequency Band.</font><font size=3 face="Times New Roman">
</font><font size=2 face="sans-serif"><br>
Therefore there would be a discrepancy of meaning about the term Global
between the GSCID and the GVCID</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="sans-serif"><br>
Last, but not list the book title "CCSDS Global Spacecraft Identification
Field" points to a field i.e. a portion of data that is normally contained
in transfer frames. In other words while the actual GSCID matches completely
the contents of some bits of a Frame Header, the proposed future GSCID
will not.</font><font size=3 face="Times New Roman"> <br>
</font><font size=2 face="sans-serif"><br>
As a conclusion I would retain the current definition of GSCID while
adding a new definition for the concatenation of the frequency band
(FB), 2-bit Version Number (VN) and the SCID.</font><font size=3 face="Times New Roman">
</font><font size=2 face="sans-serif"><br>
This could be called Universal SCID, Super SCID, Supreme SCID, Frequenced
SCID or whatever you prefer. [Please consider some humour
in some proposed definitions.]</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="sans-serif"><br>
Regards</font><font size=3 face="Times New Roman"> <br>
</font><font size=2 face="sans-serif"><br>
Gian Paolo</font><font size=3 face="Times New Roman"> <br>
</font><font size=2 face="sans-serif"><br>
PS Of course I did not perform a complete review of the document.......</font><font size=3 face="Times New Roman">
<br>
<br>
</font><img src=cid:_1_0A1C3538108863640044B48BC1257FEF style="border:0px solid;"><font size=2 face="sans-serif"><br>
</font><img src=cid:_1_0A1C3780108863640044B48BC1257FEF style="border:0px solid;"><font size=3 face="Times New Roman"> </font>
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