<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:v =
"urn:schemas-microsoft-com:vml" xmlns:o =
"urn:schemas-microsoft-com:office:office" xmlns:w =
"urn:schemas-microsoft-com:office:word" xmlns:x =
"urn:schemas-microsoft-com:office:excel" xmlns:p =
"urn:schemas-microsoft-com:office:powerpoint" xmlns:a =
"urn:schemas-microsoft-com:office:access" xmlns:dt =
"uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s =
"uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs =
"urn:schemas-microsoft-com:rowset" xmlns:z = "#RowsetSchema" xmlns:b =
"urn:schemas-microsoft-com:office:publisher" xmlns:ss =
"urn:schemas-microsoft-com:office:spreadsheet" xmlns:c =
"urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc =
"urn:schemas-microsoft-com:office:odc" xmlns:oa =
"urn:schemas-microsoft-com:office:activation" xmlns:html =
"http://www.w3.org/TR/REC-html40" xmlns:q =
"http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc =
"http://microsoft.com/officenet/conferencing" XMLNS:D = "DAV:" XMLNS:Repl =
"http://schemas.microsoft.com/repl/" xmlns:mt =
"http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2 =
"http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda =
"http://www.passport.com/NameSpace.xsd" xmlns:ois =
"http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir =
"http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds =
"http://www.w3.org/2000/09/xmldsig#" xmlns:dsp =
"http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc =
"http://schemas.microsoft.com/data/udc" xmlns:xsd =
"http://www.w3.org/2001/XMLSchema" xmlns:sub =
"http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec =
"http://www.w3.org/2001/04/xmlenc#" xmlns:sp =
"http://schemas.microsoft.com/sharepoint/" xmlns:sps =
"http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi =
"http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs =
"http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf =
"http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p =
"http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf =
"http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss =
"http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi =
"http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi =
"http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver =
"http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m =
"http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels =
"http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp =
"http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t =
"http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m =
"http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl =
"http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl =
"http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService"
XMLNS:Z = "urn:schemas-microsoft-com:" xmlns:st =
""><HEAD><TITLE>Message</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16788" name=GENERATOR>
<STYLE>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
/* List Definitions */
@list l0
{mso-list-id:428159834;
mso-list-type:hybrid;
mso-list-template-ids:-414293894 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level2
{mso-level-tab-stop:1.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level3
{mso-level-tab-stop:1.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level4
{mso-level-tab-stop:2.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level5
{mso-level-tab-stop:2.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level6
{mso-level-tab-stop:3.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level7
{mso-level-tab-stop:3.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level8
{mso-level-tab-stop:4.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level9
{mso-level-tab-stop:4.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1
{mso-list-id:1594512947;
mso-list-type:hybrid;
mso-list-template-ids:-414293894 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l1:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level2
{mso-level-tab-stop:1.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level3
{mso-level-tab-stop:1.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level4
{mso-level-tab-stop:2.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level5
{mso-level-tab-stop:2.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level6
{mso-level-tab-stop:3.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level7
{mso-level-tab-stop:3.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level8
{mso-level-tab-stop:4.0in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l1:level9
{mso-level-tab-stop:4.5in;
mso-level-number-position:left;
text-indent:-.25in;}
@list l2
{mso-list-id:1767336776;
mso-list-type:hybrid;
mso-list-template-ids:-2058693596 -169944224 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l2:level1
{mso-level-text:"%1\)";
mso-level-tab-stop:none;
mso-level-number-position:left;
margin-left:1.25in;
text-indent:-.25in;}
@list l3
{mso-list-id:2063669877;
mso-list-type:hybrid;
mso-list-template-ids:-1559062214 2066531714 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l3:level1
{mso-level-start-at:2;
mso-level-text:%1;
mso-level-tab-stop:none;
mso-level-number-position:left;
margin-left:1.25in;
text-indent:-.25in;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
-->
</STYLE>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></HEAD>
<BODY lang=EN-US vLink=purple link=blue>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>Greg,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>Please find hereafter CNES position on the subject
matter :</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>- we support rec 2.2.8 proposed modifications : adding
a 2 Mbps rate, adding more intermediate rates with a 1.5 dB
progression.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>- we prefer ESA proposal for the computation of the
rates : 1000*Round(2^(n/2),1)</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>As for the tolerance on the rates, for us +/-1% is too
loose as it might not be compatible with a narrow rate recovery loop on-board.
+/-0.1% is more the order of magnitude of precision we would like to keep in the
spec.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>Best regards,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=265500023-07062010>Gilles</SPAN></FONT></DIV>
<DIV> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=fr><FONT face=Arial size=2>Gilles MOURY</FONT></SPAN> <BR><SPAN
lang=fr><FONT face=Arial size=2>CNES Toulouse</FONT></SPAN> </P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>De :</B> Lesthievent Guy
<BR><B>Envoyé :</B> lundi 7 juin 2010 18:29<BR><B>À :</B> Moury
Gilles<BR><B>Cc :</B> Robert Emmanuel; Guerin Alexandre; Loisel
Celine<BR><B>Objet :</B> TR : [Sls-ngu] NGU Action item on TC data rates-
Section 2.2.8 in current CCSDS (401-B-20) recommendation <BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010>Bonsoir Gilles,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=426040916-07062010>Suite
à la propagation de l'info en interne RF et concertation, il semble que l'on
soit tous pour la modification de la Rec 2.2.8 avec la progression par pas de
1.5 dB du rythme TC et avec la fonction 1000*Round(2^(n/2),1) selon la table de
la proposition ESA.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=426040916-07062010>Pour
ce qui est de la précision abordée par la NASA, il faudrait plutôt du +-500 ppm
voire +- 1000 ppm (1 pour mille)que du +- 1% car sinon celà peut ne pas
être compatible d'un ressèrement de la boucle de rythme bord. Pourquoi un tel
relachement de précision ?</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=426040916-07062010>Tu
peux transférer notre avis coté NGU.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010>Salutations</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010>Guy</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=426040916-07062010></SPAN></FONT> </DIV>
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left><FONT face=Tahoma
size=2>-----Message d'origine-----<BR><B>De :</B> Robert Emmanuel
<BR><B>Envoyé :</B> lundi 7 juin 2010 17:59<BR><B>À :</B> Lesthievent
Guy<BR><B>Objet :</B> TR: [Sls-ngu] NGU Action item on TC data rates-
Section 2.2.8 in current CCSDS (401-B-20) recommendation <BR><BR></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>bonjour Guy,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>après lecture, je te confirme notre échange de ce
matin.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>rien de génant dans cette proposition qui va très
largement au delà des besoins estimés en lien TC. Des valeurs voisines de 100
kbps nous semblaient déjà représenter un véritable bond technologique apr
rapport à ce qui est réalisé actuellement.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>concernant l'étalement des débits proposés,
</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>la raison 1.5 db semble un bon compromis : elle permet
un ajustement suffisament fin sans trop alourdir le choix.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>je pense que la fonction INT peut générer des
ambiguités en proposant des valeurs identiques pour différentes prog.
</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>la fonction ROUND ( ,1) resoud ce problème et me
convient très bien.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>tu peux faire la réponse à Gilles.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010>Emmanuel </SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=780044515-07062010></SPAN></FONT> </DIV><FONT face=Arial
color=#0000ff size=2></FONT><BR>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>De :</B> Guerin Alexandre
<BR><B>Envoyé :</B> lundi 7 juin 2010 09:44<BR><B>À :</B> Robert
Emmanuel<BR><B>Objet :</B> TR : [Sls-ngu] NGU Action item on TC data rates-
Section 2.2.8 in current CCSDS (401-B-20) recommendation <BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010>Emmanuel,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=686453907-07062010>As-tu
un avis particulier sur la question ? car moi non...</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=686453907-07062010></SPAN></FONT> </DIV>
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left><FONT face=Tahoma
size=2>-----Message d'origine-----<BR><B>De :</B> Moury Gilles
<BR><B>Envoyé :</B> dimanche 6 juin 2010 21:50<BR><B>À :</B>
Lesthievent Guy; Guerin Alexandre<BR><B>Cc :</B> Soula
Jean-Marc<BR><B>Objet :</B> TR: [Sls-ngu] NGU Action item on TC data rates-
Section 2.2.8 in current CCSDS (401-B-20) recommendation <BR><BR></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>Bonjour Guy et Alexandre,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>Avons-nous une position CNES sur ces modifications de
la recom 2.2.8 :</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>- ajout d'un rate à 2 Mbits/s</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>- ajout de débits intermédiaires suivant une
progression par step de 1,5 dB</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>- spécification de tolérance à 1% sur les
débits</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>Merci pour votre retour,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=937595816-06062010>A+<BR>Gilles</SPAN></FONT></DIV>
<DIV> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=fr><FONT face=Arial size=2>Gilles MOURY</FONT></SPAN> <BR><SPAN
lang=fr><FONT face=Arial size=2>CNES Toulouse</FONT></SPAN> </P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>De :</B> sls-ngu-bounces@mailman.ccsds.org
[mailto:sls-ngu-bounces@mailman.ccsds.org] <B>De la part de</B> Kazz, Greg J
(313B)<BR><B>Envoyé :</B> jeudi 3 juin 2010 23:58<BR><B>À :</B>
sls-ngu@mailman.ccsds.org<BR><B>Cc :</B>
sls-rfm@mailman.ccsds.org<BR><B>Objet :</B> [Sls-ngu] NGU Action item on TC
data rates- Section 2.2.8 in current CCSDS (401-B-20) recommendation
<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>All,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>At the CCSDS Spring 2010 meeting in Portsmouth, VA, USA the
RF&MOD WG chair asked the NGU WG for clarification on how to specify the 1.5
dB steps that NGU was proposing for increasing the number of Telecommand (TC)
data rates. See RF&MOD proposed solutions in the attached Word document for
Section 2.2.8 in the <SPAN style="COLOR: black">current CCSDS (401-B-20)
recommendation.</SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>In summary, the current proposed NGU goals are to achieve the
following:<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Add 2048000 bit/sec data rate to the Telecommand
Standard<o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Change the step size between data rates to be 1.5 dB
steps instead of the current 3 dB steps and provide a formula and new list of
rates<o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Provide a requirement on the tolerance associated with
those data rates<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>After receiving more NASA comments on this proposal, NASA
would like to change this proposal as follows (I would appreciate feedback from
NGU members on this please – RF&MOD WG is welcome to comment but I have only
copied them for information only):<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>For all existing TC data rates defined today and the
newly proposed highest rate of 2048 Kbps , specify each data rate to <U>3
significant figures</U>. In addition, in Section 2.2.8, state the
<U>validity range for each defined data rate. </U> For the example of 2048
Kbps define it to be 2.05 x 10^6 bits per second between 2.04 x 10^6 and
2.06 x 10^6 bps, i.e., +-1%.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in">So for the existing 11 data rates
in 2.2.8 and the new 2048Kbps rate, the change would be:<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in"><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in">1000 bps becomes data rate 1.00x
10^6 bits/sec between 0.99x10^6 bits/sec and 1.01 x 10^6 bits/sec<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in">2000 bps becomes data rate 2.00x
10^6 bits/sec between 1.99x10^6 bits/sec and 2.01 x 10^6 bits/sec<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in">…<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in">2048000 bps becomes data rate
2.05x 10^6 bits/sec between 2.04x10^6 bits/sec and 2.06 x 10^6
bits/sec<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in"><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in"><o:p> </o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in"><o:p> </o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Given note 2) below, forget about changing any data rate
step sizes of existing or future data rates. <o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-list: Ignore">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>The tolerance associated with those rates becomes the
validity ranges for those rates.<o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-list: Ignore">4.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Paragraph c) in the attachment limits the modulation to
PCM/PM/Bi-phase-L. Why? Is this overly restrictive to allow only Bi-phase-L?
What is wrong with allowing Bi-Phase- M or Bi-Phase-S as
well?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Motivation for these changes:<o:p></o:p></P>
<P class=MsoListParagraph
style="MARGIN-LEFT: 1.25in; TEXT-INDENT: -0.25in; mso-list: l2 level1 lfo5"><![if !supportLists]><SPAN
style="mso-list: Ignore">1)<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>The data rate as specified today is often taken too
literally. So if we specify 1024 Kbps as 1, 024, 000 bits per second people tend
to interpret that value to be valid to 7 significant figures, which is way
beyond what is really required for successful synchronization. The more prudent
way to specify rates is by stating the number of significant digits and a
validity range around the defined rate. It is open to debate whether or not
+- 1% is too loose or too tight a validity range. <o:p></o:p></P>
<P class=MsoListParagraph
style="MARGIN-LEFT: 1.25in; TEXT-INDENT: -0.25in; mso-list: l3 level1 lfo4"><![if !supportLists]><SPAN
style="mso-list: Ignore">2<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Unclear at this time that finer data rate steps are
really desirable for future missions. Also 1.5 dB steps is only a best guess.
There is a risk of over specification at this point which seems unwarranted.
<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 1in"><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Greg Kazz<o:p></o:p></P>
<P class=MsoNormal>Chairman CCSDS SLS-NGU WG<o:p></o:p></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.75in"><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BODY></HTML>