 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] T. METCALF         ]    PASS PROGRAM NOTE        ]       39359      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] DEV/282-8436       ]      RELEASE NOTE( )        ] SEP. 1987        ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] G1, G2, G3, G6, G8, G9, PL9     ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: OPS, BUS, I/O                                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SANU                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] BFS - PASS I/O WINDOWS MISSED                                       ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] IF AN OPS MODE RECALL (BUS RECONFIGURATION) IS REQUESTED AND I/O    ]
 ] ERRORS (1 OR GREATER) ARE ENCOUNTERED, THE BFS LISTEN WINDOWS CAN   ]
 ] BE MISSED (BFS ICD REQUIREMENT), CAUSING BFS DOWNMODING OF MULTIPLE ]
 ] FLIGHT CRITICAL STRINGS. ALSO, A SINGLE TRANSMITTER FAILURE, OR AN  ]
 ] I/O RESET TO THE PASS WITH A TRANSMITTER FAILED, WHICH OCCURS ON AN ]
 ] HFE CYCLE PRECEDING AN MFE CYCLE, CAN CAUSE BFS TRANSFER DATA TO    ]
 ] MISS THE LISTEN WINDOW AND ALSO CAUSE AN HFE OVERRUN. THESE         ]
 ] CONDITIONS WILL RESULT IN THE BFS GOING FROM TRACKING MODE TO       ]
 ] STAND-ALONE MODE. OTHER ERROR CONDITIONS CAN CAUSE HFE OVERRUNS     ]
 ] WITHOUT CAUSING THE BFS TO GO TO THE STAND-ALONE MODE.              ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] FOR CIRCUMSTANCES WHERE THE BFS DOES GO TO THE STAND-ALONE MODE, AN ]
 ] I/O RESET TO THE BFS MAY BE ISSUED TO RESTORE THE BFS TO TRACKING   ]
 ] MODE.                                                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 8/4/88  ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 8/10/88 ]                             ]
 ]    --------------------      ---------] JACK BOYKIN         8/17/88 ]
 ]PF MGR: MICHAEL BRIEDEN   DATE 8/8/88  ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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