Comments on ``The QPSX MAN' [with authors' reply]

For original article see ibid., vol.26, no.4, p.20 (1988). The commenter contends that the authors of the above-mentioned article miscompare dual bus and dual ring topologies. He addresses what he believes should be the main point of interest to the telephone companies when they are assured that QPSX will measure up to the public network requirements, namely, reliability and maintainability. He uses QPSX and FDDI to compare dual bus/dual ring reliability, showing that QPSX is less reliable. The original authors refute Dr. Rocher's comments regarding the reliability of QPSX, and they emphasize that the numerous other advantages of QPSX listed in their article stand undiminished