 +_____________________________________________________________________
  AUTHOR:                                          DR:              
  PAUL TICE              PASS PROGRAM NOTE              110386      
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  ORG/PHONE:          OPS NOTE (X)  USER NOTE ( )  DATE:            
 SSOAS/(281)335-2239       RELEASE NOTE( )                  05/12/97
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
  OI-26 AND OI-26B                CREW ( )  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW (X)  GNC ( )  VU ( )  SM/PL ( ) S2,S4                           
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  SOFTWARE SUB-AREA: UPLINK                                           
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  PRINCIPAL FUNCTIONS: SULK                                           
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  TITLE:                                                              
        ERROR IN PROCESSING DUE TO INCOMPLETE UL CMDS TO SM GPC       
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  DESCRIPTION:                                                        
                                                                      
  THERE ARE TWO CASES INVOLVING PARTIAL UPLINK COMMANDS (NO LAST WORD 
  INDICATION RECEIVED), WHICH ARE CAUSED BY TRANSMISSION ERRORS:      
                                                                      
  1) IF A PARTIAL PAYLOAD THROUGHPUT COMMAND (PTC) IS RECEIVED BY THE 
     SM GPC AFTER A FULL TWO-STAGE COMMAND, A SUBSEQUENT SM TWO-STAGE 
     EXECUTE WILL BE ERRONEOUSLY REJECTED WITH AN "EXEC PARTIAL TWO-  
     STAGE BUFFER ERROR" DOWNLISTED IN BIT 13 OF THE SM NSP VAL WORD. 
                                                                      
  2) IF A PARTIAL TWO-STAGE COMMAND IS RECEIVED BY THE SM GPC         
     FOLLOWED BY A FULL PTC, A SUBSEQUENT SM TWO-STAGE EXECUTE WOULD  
     CAUSE EXECUTION OF THE PARTIAL TWO-STAGE COMMAND.                
                                                                      
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 USER RESPONSE:                                                       
                                                                      
  1) AFTER VERIFYING THAT A FULL/VALID COMMAND RESIDES IN THE SM      
     TWO-STAGE BUFFER, A PTC BUFFER CLEAR COMMAND UPLINKED TO THE SM  
     GPC WILL ADDITIONALLY UNLOCK THE SM TWO-STAGE BUFFER.  THEN AN   
     SM TWO-STAGE EXECUTE COMMAND AND SUBSEQUENT PTCS WILL BE         
     SUCCESSFULLY EXECUTED BY SYSTEM SOFTWARE.                        
                                                                      
  2) UPLINK AN SM TWO-STAGE BUFFER CLEAR COMMAND FOLLOWED BY THE      
     REUPLINK OF THE SM TWO-STAGE COMMAND AS WOULD NORMALLY BE        
     PERFORMED FOR THIS CASE.                                         
                                                                      
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 CONCURRENCE:                           APPROVAL:                    
 SSOAS:  JOHN MAGLEY       DATE 06/17/97                             
       ------------------      ---------                             
 ASD:   ERIC C. BINGHAM    DATE 06/26/97                             
       ------------------      --------- DARRELL E. STAMPER 07/21/97 
 PF MGR:DEBRA I. ELDRIDGE  DATE 07/07/97------------------- -------- 
       ------------------      --------- CHAIRMAN, SASCB      DATE   
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