In this paper, we determine the performance of a packet data multiplexer with go-back-N ARQ protocol under Markovian interruption. It is assumed that the input process into the system is Poisson process. The output channel is divided into a series of time slots and a data packet can be transmitted in a slot time. It is modeled that the output channel can be blocked by some Markovian interruption, whose state change between the blocking and non-blocking states is given by Markov process.The overall system has been analyzed by considering a relationship, taking the Markovian interruption into account, about the buffer behavior between two successive frames or slots. The concept of virtual buffer occupancy is introduced to simplify the analysis. As a result of this analysis, the buffer behavior has been found. The validity of this analytical results has been verified by computer simulation.
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