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A new approach to MBC protocol analysis is presented which differs from previous techniques in that the channel is not assumed to be binary symmetric and instead the channel errors are modelled by the Fritchman model. In addition, the large body of existing literature on protocol analysis applicable to continuous channels can generally be applied with few modifications. The protocols are compared on the basis of the expected number of bits transferred per burst. The results of applying this analysis approach to an ARQ, a Type-I hybrid and a Type41 hybrid protocol are also presented.