Issue 6 page 3 1 january 1987 ccsds report concerning

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Unformatted text preview: CONCERNING TELECOMMAND: SUMMARY OF CONCEPT AND SERVICE APPLICATION PROCESS LAYER PEER PROCESS SENDING END USER RECEIVING END SUBSYSTEM INPUT: USER REQUESTS FOR COMMAND ACTIONS. DELIVERY INSTRUCTIONS. OUTPUT: EXECUTED COMMAND ACTIONS WHICH CHANGE SPACECRAFT STATE. FUNCTION: TRANSLATE USER REQUESTS TO NAMED SETS OF CMD DIRECTIVES AND EXECUTION CONDITIONS. TRANSLATE DELIVERY INSTRUCTIONS TO OVERALL SESSION CONTROL PARAMETERS (DELIVERY REQUIREMENTS). OUTPUT: NAMED SETS OF CMD DIRECTIVES, DELIVERY REQUIREMENTS. EXECUTION CONDITIONS. CONTROL SERVICE REMOTE PROCESSES FUNCTION: EXECUTE NAMED SET OF COMMAND DIRECTIVES WHEN OPERATIONAL CONDITIONS ARE MET. COMMAND DIRECTIVES UNDEFINED INPUT: NAMED SETS OF CMD DIRECTIVES, EXECUTION CONDITIONS. SYSTEM MANAGEMENT LAYER Figure 3-1: TC Application Process Layer Issue 6 Page 3-2 January 1987 CCSDS REPORT CONCERNING TELECOMMAND: SUMMARY OF CONCEPT AND SERVICE 3.1.2 TC SYSTEM MANAGEMENT LAYER The basic service of the TC System Management layer is to provide translation of command directives into transportable telecommand application data units, supervise their delivery to the receiving end of the layer, and to translate the application data back into command directives (if required) prior to delivery to the receiving application process. Figure 3-2 depicts the activities and interfaces of the TC System Management layer. SYSTEM MANAGEMENT LAYER PEER PROCESS SENDING END RECEIVING END APPLICATION PROCESS LAYER INPUT: NAMED SETS OF CMD DIRECTIVES. DELIVERY RQMTS EXECUTION CONDITIONS. FUNCTION: TRANSLATE NAMED SETS OF COMMAND DIRECTIVES TO NAMED SETS OF TRANSPORTABLE APPLICATION DATA UNITS. MANAGE TC SESSIONS. SPECIFY TRANSPORT CONTROL PARAMETERS. CONSTRAINT CHECKING. OUTPUT: NAMED SETS OF APPLICATION DATA. TRANSPORT CONTROL PARAMETERS. OUTPUT: NAMED SETS OF CMD DIRECTIVES. EXECUTION CONDITIONS. DELIVER TC SERVICE APPLICATION DATA TELECOMMAND APPLICATION DATA UNITS UNDEFINED FUNCTION: DELIVER NAMED SETS OF TC APPLICATION DATA (TRANSLATED TO NAMED SETS OF COMMAND DIRECTIVES, IF REQUIRED BY APPLICATION PROCESS). GENERATE DELIVERY STATUS REPORTS FOR TELEMETRY SYSTEM. INPUT: NAMED SETS OF TC APPLICATION DATA. PACKETIZATION LAYER Figure 3-2: TC System Management Layer Issue 6 Page 3-3 January 1987 CCSDS REPORT CONCERNING TELECOMMAND: SUMMARY OF CONCEPT AND SERVICE Inputs at the sending end of the TC System Management layer are integrated, aggregated, and named sets of multi-user command directives, along with control instructions specifying their overall delivery requirements. The named command directives are parsed by the System Management layer and translated (if required) into correspondingly named sets of TC application data which are compatible with handling by the layer below. The TC application data are partitioned into appropriate blocks for transmission during individual TC sessions, and (along with necessary control instructions) are passed to the layer below for transport. At the receiving end of the TC System Management layer, named sets of user applicati...
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