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This paper presents mathematical and computer tools for the evaluation of data overheads 1n message streams considering a two-stage framing and a retransmission protocol for error correction: a typical case of IBM-SNA with SDLe. The paper also describes an application that illustrates the use of the tools and that shows how the various factors affecting the overheads can be balanced, so that minimum overheads and consequently maximum throughput can be achieved. The general approach used in thedoi:10.1016/s1319-1578(97)80004-3 fatcat:snzqxpfxpng57iwhtmtlhnzeii