 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] T. METCALF         ]    PASS PROGRAM NOTE        ]      56157       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/282-8436       ]      RELEASE NOTE( )        ] REV A: 01/03/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI07 AND SUBS                 ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC (X)  VU ( )  SM/PL ( )] G1, G2, G3, G6, G8              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  I/O                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SBIO, SS2                                      ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] MULTIPLE RTCIO UPLINKS ON FC BUSES MAY JITTER HFE I/O               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] WHENEVER MULTIPLE REAL TIME COMMAND I/O (RTCIO) REQUESTS FOR THE    ]
 ] FLIGHT CRITICAL BUSES ARE MADE IN A FLIGHT OPS, THE POSSIBILITY     ]
 ] EXISTS OF JITTERING THE START OF HFE I/O.  THIS IS DUE TO THE       ]
 ] HIGH AMOUNT OF FC BUS CONTENTION IN THESE OPS.  THIS POSSIBILITY    ]
 ] INCREASES WITH THE NUMBER OF REQUESTS AND WITH INCREASED BUS        ]
 ] CONTENTION DUE TO I/O ERROR PROCESSING.                             ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] BE AWARE THAT THE POSSIBILITY OF HFE JITTER EXISTS WHEN CONSIDERING ]
 ] RTCIO REQUESTS FOR THE FLIGHT CRITICAL BUSES IN FLIGHT OPS.         ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 02/04/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  W. R. PRUETT       DATE 02/07/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 02/08/91 ]
 ]PF MGR:ELIZABETH FOUNTAIN DATE 02/05/91]------------------- -------- ]
 ]       ------------------     ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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