To solve calculable problem of IEEE-1394b network interconnection reliability, based on IEEE-1394b topology, a task based analysis method of system reliability was proposed, a reliability model of IEEE-1394b interconnection system was developed and the system reliability matrix definition was shown. To accord with IEEE-1394b characteristic, the definition of IEEE-1394b interconnection matrix was proposed.Model analysis of IEEE-1394b interconnection system in avionic system was made. Task routes, single route failure probability and task routes reliability were presented. The relay ports influences were analyzed and the conclusion is that relay ports influence IEEE-1394b interconnection system most.
 IEEE Std 1394bTM-2002,IEEE Standard for a High-Performance Serial Bus—Amendment 2[S]
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