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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear TCONS members,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dai asked me to fill him in on the results
of yesterday's teleconference.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Once I had started to write a reply I
thought that it would be useful for everyone.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Please let me know if I have got anything
wrong.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The current plan is to complete the work on
the Guaranteed Service prior to the meeting in Athens. Then whatever is agreed
there we will have finished that work so that when we return to it in two years
time at least we will not have to start again from scratch. I want to spend one
day in Athens briefly going over this and making sure that there are no major
issues and that the various sub sections for the Best Effort and Guaranteed Delivery
services are consistent. We will then move on to work on the scheduled service,
which everyone agrees is needed. At the same time we will ask those people that
have proposed TCP/IP for TCONS to work on a section for the red book that we
can review once complete. We will also review the idea of using the Network and
look at the reliability model for spacecraft onboard networks.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Chris and Patrick plan to rigorously
defend TCONS at the CESG meeting based on the constraints and needs of the
onboard network environment.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The proposed agenda for the TCONS group work
at Athens is:</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<ol style='margin-top:0cm' start=1 type=1>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Blood letting and hot air
generation (Athens is a good choice of venue, although somewhere in Italy
would have been better) - half a day</span></font></li>
<ol style='margin-top:0cm' start=1 type=a>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>This will hopefully result in
an action on some TCP/IP experts to write a section for the TCONS red
book for review by us at the Fall meeting</span></font></li>
</ol>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Requirements from Messaging
Service - half a day</span></font></li>
<ol style='margin-top:0cm' start=1 type=a>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Particularly on traffic
classes (QoS)</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Are there any time critical
requirements that cannot be met by TCP/IP?</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Is it envisaged to run
Messaging service over TCP/IP or UDP, what would the constraints be?</span></font></li>
</ol>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Review of Best Effort and Guaranteed
Delivery services - no more than one day</span></font></li>
<ol style='margin-top:0cm' start=1 type=a>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Aim is to tidy up what we have
done so far so that we can push the scheduled service forward</span></font></li>
</ol>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Consideration of IP header for
TCONS network layer pros and cons - no more than half a day</span></font></li>
<ol style='margin-top:0cm' start=1 type=a>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>What fields do we need?</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Pros and cons of header
compression?</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>How are different traffic
classes handled?</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Outline recommendation for a
compressed version of IP header</span></font></li>
</ol>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Reliability model for SOIS - half
a day to one day</span></font></li>
<ol style='margin-top:0cm' start=1 type=a>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Reliability on a spacecraft</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Development of a reliability
model</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>This is important to prepare
for the work on the scheduled service</span></font></li>
</ol>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Scheduled Delivery service -
two days + Saturday after the TCONS outing</span></font></li>
<li class=MsoNormal style='color:navy'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Odds and Sods (those other
meetings that we cannot get out of)</span></font></li>
</ol>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>TCONS members comments on this agenda please.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>PS Dai - Thanks for the update to the red
book.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I will send out an updated red book on
Thursday next week.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steve</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>------------------------------------------</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Steve Parkes</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Space Systems Research Group</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Applied Computing, University of Dundee</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Dundee, DD1 4HN, Scotland, UK</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Tel: +44 1382 345194</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Fax: +44 1382 348838</span></font></p>
<p class=MsoAutoSig><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Mobile: +44 784 138 3779</span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Dai Stanton [mailto:dstanton@keltik.co.uk] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 31 March 2005 21:59<br>
<b><span style='font-weight:bold'>To:</span></b> sparkes@computing.dundee.ac.uk<br>
<b><span style='font-weight:bold'>Subject:</span></b> TCONS</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Steve,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Sorry I had to leave the TCONS call telecom today. What was
the conclusion?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is TCONS going ahead in its current form?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dai</span></font></p>
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