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Many digital systems, such as PCM systems, data processing and data transmission systems, use twisted ring counters. Most of these twisted ring counters are subject to multimoding. This paper develops tools and methods for predicting all possible modes in twisted ring counters, and derives a general solution for suppressing the wrong modes. Suppression is accomplished by adding a few circuit connections from the output of certain stages to the input of another stage. The paper derives the number of necessary connection lines and their connection points for the various types of counters.

Two laboratory computers have been interconnected through an addressed-block data transmission system (ring) as described by J. R. Pierce and implemented by W. J. Kropfl. This paper gives an idea of the equipment, programming, and protocols of communication through that system.