Demonstration Instrument Control Unit Software Architecture

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=50 BGCOLOR="#333366" TEXT="#080000"> <div> <B>Demonstration Instrument Control Unit Software Architecture</B></div> <div> </div> </td> </tr><tr> <td valign="top" width=165 BGCOLOR="#CCCC99" TEXT="#080000"> <div> <B> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="132" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 35 ><NOBR><div> <IMG BORDER="0" SRC="1x1.gif" HEIGHT="29" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" WIDTH="21"></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <IMG BORDER="0" SRC="1x1.gif" HEIGHT="29" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" WIDTH="21"></div> </NOBR></tD> <tD VALIGN=TOP WIDTH="20"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="20" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP><NOBR><div> <A HREF="id73.htm" TARGET="_top" TITLE="Instrument Control Unit Software"><U><B><IMG SRC="0060d1d0.gif" border=0 width="13" height="29" ALT="up" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></U></A></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <IMG BORDER="0" SRC="1x1.gif" HEIGHT="29" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" WIDTH="27"></div> </NOBR></tD> </tR> </TABLE></B></div> <bR> </td> <td valign="top" height=430 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> The resulting system is structured in line with the logical model presented in the Packet Utilisation Standard.</div> <bR> <div>      <IMG SRC="0e5168c0.gif" border=0 width="534" height="140" ALT="Software Architecture" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> Blue<FONT SIZE="3" COLOR="#000000" FACE="Arial" > boxes represent application processes.</FONT></div> <div> Green<FONT SIZE="3" COLOR="#000000" FACE="Arial" > boxes are supporting elements concerned with onboard traffic management.</FONT></div> <div> Red <FONT SIZE="3" COLOR="#000000" FACE="Arial" >ovals are external systems.</FONT></div> <bR> <div> A short introduction is given to each of the components.</div> <bR> <div> Up-Downlink Interface</div> <div> Special application process managing the interface to the Data Handling System. Implements any protocols applicable to the uplink and downlink (e.g. 'Packet Telecommand Standard', Packet Telemetry Standard').</div> <div> Transforms received telecommand source packets into an internal representation, forwarding these to the <A HREF="#packet_router" TITLE="Demonstration Instrument Control Unit So"><U>Packet Router</U></A>.</div> <div> Transforms generated telemetry source packets into the external format forwarding these to the Data Handling System.</div> <div> Such an application process is present in all data handling systems developed based on the reusable software components.</div> <bR> <div>  <A NAME="packet_router"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A>Packet Router</div> <div> Responsible for routing of source packets between application processes.</div> <div> May be seen as an implementation of the 'Onboard Traffic Management Service' introduced in <A HREF="id100.htm" TARGET="_top" TITLE="Packet Utilisation Standard"><U>Packet Utilisation Standard</U></A>.</div> <bR> <div> Application Process</div> <div> Application process  is providing a collection of <A HREF="id100.htm" TARGET="_top" TITLE="Packet Utilisation Standard"><U>Packet Utilisation Standard</U></A>  services for the instrument or subsystem to which it is associated.</div> <div> Only one application process is included by now.</div> <bR> </td> </tr></table></body>