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For advanced fault tolerant satellite systems new data bus architectures and media access protocols have to be developed to distribute common processing elements and functions among all subsystems. Different architectures with differing access protocols and topologies have to be traded to arrive at an optimum bus architecture for Satellite High Speed data transfer applications. In this paper, we discuss a High Speed Data Bus (HSDB) architecture and evaluate Media Access Control (MAC) protocols. We simulated Fiber Distributed Data Inierface (FDDI) and Reservation Access Protocols applicable to HSDB. Performance Metric including throughput, delay, queue length and station latency are considered. We proposed a deferred priority protocol and compared throughput-delay performance with preemptive priority and normal priority protocols for FDDI.